Skip to content Training for your first marathon is one of the best decisions you’ll ever make — and the watch on your wrist will be your coach, your pacer, and your training log for the next 16–20 weeks. But walk into this buying decision wrong and you’ll either overspend on features you’ll never use or, worse, bonk your race because your watch died at mile 22.
This guide is built specifically for first-time marathoners: runners who need reliable GPS, wrist heart rate, and enough battery to outlast a 4–6 hour finish — without paying for ultramarathon or triathlon features they don’t need yet. Every recommendation below is grounded in current 2026 models, verified specifications, and what reviewers actually say about these watches right now.
You don’t need a $800 flagship. You need the right $150–$450 watch. Let’s find it.
How We Picked These Watches
We didn’t just sort by price. Every watch on this list had to clear four non-negotiable bars for marathon beginners:
- Built-in GPS with 15+ hours of battery. The 2× rule (explained below) means a 5-hour finisher needs ~10 hours of rated GPS. We set the floor at 15 to leave real margin.
- Wrist-based heart rate. Zone-based training is how beginners build aerobic fitness without burning out. No HR sensor, no recommendation.
- A real training ecosystem. Free coaching plans (Garmin Coach, COROS training plans) or a best-in-class app platform (Apple). A watch that just records data without guiding you is a missed opportunity for a first-timer.
- Current-generation models. Every pick is a 2026-current model you can actually buy new today — no discontinued watches, no “great if you find it refurbished” compromises.
We cross-checked specifications against manufacturer pages and weighed independent reviewer consensus from 2026 — including Tom’s Guide, TechRadar, Wareable, and the5krunner — to make sure our picks match what the running community actually recommends.
What About the Apple Watch Series 12?
If you’ve read our Apple Watch Series 12 review, you might wonder why it’s not on this list. The Series 12 is a superb watch — but at $399 with ~30 hours of total battery and a 10-hour workout rating, it’s overkill for a first marathon budget and still a daily-charge device. For $150 less, the SE 3 gives iPhone users everything they need for race day, and the Garmin/COROS options give everyone else far more battery. The Series 12 is the best Apple Watch for runners who want it all; this list is about the smartest buy for your first marathon.
Your First 4 Weeks With a Marathon Watch
Buying the watch is step one. Here’s how to actually use it:
Week 1: Wear it 24/7
Don’t even run yet — just wear it. The watch needs baseline data: resting heart rate, sleep patterns, HRV. This baseline is what makes the coaching features smart later.
Week 2: Start a Garmin Coach / training plan
Pick your race date and goal in the app. The plan adapts to your fitness — trust the easy days. Most beginners run their easy runs too fast; the watch’s zone alerts fix that.
Week 3: Learn your zones
Do the watch’s guided threshold or lactate test if offered. Training in the right zones is the difference between building fitness and just getting tired.
Week 4: Test race-day setup
Do a long run with your exact race-day configuration: the data screens you’ll use, the alerts you’ll set, the music setup. Discover problems on a training run, not at mile 18.
Myths Beginners Believe About Marathon Watches
❌ Myth: “I need the most expensive watch to finish”
Fact: A $149 Forerunner 55 has everything a first marathon requires. The extra $450 for a flagship buys maps, titanium, and metrics you won’t use until marathon #3.
❌ Myth: “My phone’s GPS is good enough”
Fact: Phones die. A 5-hour marathon with GPS, music, and screen-on will kill most phones — and a dead phone means no tracking, no emergency calls, no finish-line photo.
❌ Myth: “More data is always better”
Fact: Beginners drown in metrics. Distance, pace, heart rate, and a training plan beat twenty advanced charts you’ll never open. Master the basics first.
❌ Myth: “I should buy the watch right before the race”
Fact: Buy it when training starts. The coaching features need weeks of your baseline data to give useful guidance — a watch bought on race week is just an expensive stopwatch.
⚡ Key Takeaways
- Best overall for marathon beginners: Garmin Forerunner 165 ($250) — AMOLED display, ~19 hours of GPS, and Garmin’s free coaching plans. The most-recommended first marathon watch of 2026.
- Best for iPhone users: Apple Watch SE 3 ($249) — the cheapest way into the Apple Watch ecosystem, but Apple doesn’t publish a workout-mode battery figure, so the margin for a 5–6 hour marathon is thinner than any watch here.
- Best battery per dollar: COROS PACE 4 ($249) — a remarkable 41 hours of GPS tracking with dual-band accuracy, at the same price as the Forerunner 165.
- The golden rule: your watch should have roughly 2× your expected finish time in GPS battery. For a 4–6 hour first marathon, that means 8–12 hours of rated GPS — every watch on this list clears it except the SE 3, which needs an honest asterisk.
- You do not need a $600+ flagship for your first marathon. A $150–$250 watch with GPS, wrist heart rate, and 15+ hours of battery covers everything a beginner’s training plan demands.
Our Top Picks at a Glance
🏆 Best Overall
Garmin Forerunner 165
AMOLED, 19h GPS, Garmin Coach free plans. The default answer for a reason.
$249.99
📱 Best for iPhone Users
Apple Watch SE 3
Full Apple Watch experience at the lowest price. Watch the battery asterisk.
$249
🔋 Best Battery Value
COROS PACE 4
41 hours of GPS — nearly double anything near this price. Dual-band accuracy.
$249
💰 Best Budget
Garmin Forerunner 55
Often $149 on sale. Pure running tool, zero distractions, 20h GPS.
$199.99
Find Your Perfect Marathon Watch
Answer three quick questions and we’ll point you to the right watch. No email, no nonsense.
1. What’s your budget?
How We Evaluate: Our Testing Methodology
We don\u2019t rank watches by spec sheets alone. Every recommendation on this page is evaluated against four evidence sources:
- Manufacturer specifications \u2014 verified against official Garmin, Apple, and COROS product pages (October 2026).
- Independent reviewer consensus \u2014 we weigh the judgments of Tom\u2019s Guide, TechRadar, Wareable, the5krunner, and DC Rainmaker, and we say so when they disagree.
- Real-world battery data \u2014 rated GPS hours cross-checked against reviewer testing, not just marketing claims.
- Marathon-specific suitability \u2014 the 2\u00d7 battery rule, wrist-HR accuracy for zone training, and whether the coaching ecosystem actually helps a beginner.
Transparency: GearUpToFit earns from qualifying Amazon purchases (clearly disclosed at every product box). Commissions never influence rankings \u2014 our \u201cbest overall\u201d pick is the same one independent reviewers recommend most.
At-a-Glance Comparison
| Watch | Price | Display | GPS Battery | Weight | Best For |
|---|---|---|---|---|---|
| Garmin Forerunner 165 | $249.99 | 1.2″ AMOLED | ~19h | 39g | Best overall |
| Apple Watch SE 3 | $249 | OLED, 1000 nits | 18h total* | 26g | iPhone users |
| COROS PACE 4 | $249 | 1.2″ AMOLED | 41h | 32g | Battery + value |
| Garmin Forerunner 265 | $449.99 | 1.3″ AMOLED | 20h | 47g | Data nerds |
| Garmin Forerunner 55 | $199.99 | 1.04″ MIP | 20h | 37g | Tightest budget |
| Garmin Forerunner 965 | $599.99 | 1.4″ AMOLED | 31h | 53g | Buy-once flagship |
*Apple doesn’t publish a separate workout-mode GPS figure for the SE 3 — 18h is total battery. See the battery section below for why this matters.
1. Garmin Forerunner 165 — Best Overall
🏆 Our pick: If you buy one watch for your first marathon and stop reading here, make it this one. The Forerunner 165 is the most-recommended beginner running watch of 2026 for a simple reason: it gives you a gorgeous AMOLED display, Garmin’s genuinely useful coaching ecosystem, and ~19 hours of GPS for $250.
The 165 fixed the one thing that held back every budget Garmin before it — the washed-out display. The 1.2-inch AMOLED touchscreen is bright, sharp, and makes mid-run stats actually readable in sunlight. Underneath, you get the features that matter for marathon training: Daily Suggested Workouts that adapt to your recovery, free Garmin Coach 5K-to-marathon plans, PacePro pacing strategies, VO2 max estimates, and Body Battery energy tracking.
What you don’t get: the Training Readiness score, running power, and triathlon mode reserved for the 265 and up. For a first marathon, you won’t miss them. The single-band GPS (no multi-band) is the one spec-sheet compromise, but in independent testing it tracks road running accurately — multi-band matters more for downtown skyscrapers and dense trail switchbacks than for marathon courses.
At 39 grams it’s light enough to forget, and the 11-day smartwatch battery means you’re charging roughly once a week in normal training — not every night like an Apple Watch.
Training with it: Set up Garmin Coach on day one with your marathon date. The Daily Suggested Workouts will build your week around the plan — easy runs genuinely easy (the watch buzzes if your heart rate drifts too high), workouts with clear interval guidance on screen. After 4–6 weeks, the race predictor gives you a surprisingly honest finish-time estimate to calibrate your goal.
Skip it if: you’re an iPhone user who wants cellular calls and full smartwatch features on your wrist — that’s the SE 3. Or if you know you’ll obsess over training metrics — the 265’s Readiness score will call to you.
✅ Strengths
- AMOLED display at a $250 price
- ~19h GPS — 3–4× a first marathon
- Free Garmin Coach marathon plans
- 39g — disappears on the wrist
- Music edition adds offline Spotify
❌ Weaknesses
- No multi-band GPS
- No Training Readiness score
- No triathlon mode
- 4GB storage (Music ed. only)
2. Apple Watch SE 3 — Best for iPhone Users
📱 Our pick for iPhone users: The SE 3 is the cheapest ticket into the Apple Watch world — notifications, safety features, Apple Pay, and solid run tracking. But read the battery asterisk below before race day.
Let’s correct something first: the SE 3 launched in September 2025, not 2026 — it runs the S10 chip (same as the 2025 Series 11), while the 2026 Series 12 moved to the S11 with its new Health Sensing System. That matters because the SE 3 lacks ECG, blood oxygen sensing, sleep apnea detection, and the always-on background heart-rate tracking of the Series 12.
For marathon training, what counts is this: GPS, wrist heart rate with alerts, an always-on OLED display, and 18 hours of rated battery (32 hours in Low Power Mode). The Workout app tracks runs well, and third-party apps like Nike Run Club and Strava fill any gaps. At 26 grams (40mm), it’s the lightest watch on this list.
The honest asterisk: Apple doesn’t publish a separate workout-mode GPS battery figure for the SE 3. The 18-hour rating covers mixed use. A 4-hour marathon is almost certainly fine; a 6-hour first marathon with music streaming and cellular is the scenario where we’d want more margin. If your expected finish is over 5:30, the Garmin and COROS options on this list give you far more headroom for the same money.
Training with it: The Workout app covers the basics well — custom intervals, pace alerts, heart-rate zones. Pair it with Nike Run Club or Strava for guided runs and social accountability. Enable Low Power Mode for long runs to stretch battery, and download offline music/playlists the night before. Pro tip: start the race with a full charge and cellular off (unless you need safety features) — that’s the biggest battery lever you have.
Skip it if: you’re on Android (it won’t pair), or your expected finish is 5:30+ and you don’t want to think about battery. The Forerunner 165 gives you triple the GPS headroom for the same price.
✅ Strengths
- Full Apple Watch experience for $249
- Best smartwatch features of any pick
- Lightest watch here (26g)
- Crash Detection, fall detection
- Huge third-party app library
❌ Weaknesses
- No published workout GPS battery figure
- Thinnest race-day margin on this list
- No ECG, no blood oxygen sensor
- iPhone required
- Daily charging in normal use
3. COROS PACE 4 — Best Battery Value
🔋 Our pick for battery anxiety: 41 hours of GPS. Dual-band accuracy. $249. Nothing else under $300 comes close — the Pace 4 has the best GPS-battery-per-dollar of any watch we’ve ever listed.
The Pace 4 is the current 2026 model (COROS launched it in late 2025 and is phasing out the Pace 3 and Pace Pro in its favor — don’t confuse it with the premium Pace 4 Pro at $449). At 32 grams with the nylon band, it’s the second-lightest watch here, and the 1.2-inch AMOLED display matches the Forerunner 165.
Where it pulls ahead of the Garmin: dual-frequency multi-band GPS (the 165 is single-band) and that absurd 41-hour GPS battery — 31 hours even in dual-band mode. For a beginner, that means charging every two to three weeks in normal training and never once thinking about battery on race day, warmup, cooldown, and all.
The tradeoffs are real: no NFC payments, no offline maps, no Spotify (MP3 sideload only), and no third-party app store. If you want a smartwatch that happens to run, buy the SE 3. If you want a running watch that happens to tell time brilliantly for weeks, buy this.
Training with it: COROS’s training plans are structured and effective, and the dual-band GPS means your track intervals actually measure correctly — no more 380-meter “400s.” The breadcrumb navigation is a nice bonus for exploring new long-run routes. Sideload a few MP3 playlists if you run with music; there’s no Spotify, so plan ahead.
Skip it if: you pay for everything with your watch, live in Spotify, or want a big third-party app ecosystem. The Forerunner 165 is the fuller-featured alternative at the same price.
✅ Strengths
- 41h GPS — best in class under $500
- Dual-band GPS at $249
- Full triathlon/multisport mode
- 32g — barely there
- Barometer + breadcrumb navigation
❌ Weaknesses
- No NFC payments
- No Spotify/offline streaming apps
- No third-party app store
- Smaller ecosystem than Garmin
4. Garmin Forerunner 265 — Best for Training Data
📊 Our pick for data-driven beginners: If you know you’ll fall in love with the numbers — readiness scores, HRV trends, running power — the 265 is the cheapest Garmin that gives you the full analytics suite.
The 265 is essentially the 165’s smarter sibling: same beautiful AMOLED philosophy, but with multi-band GPS with SatIQ, the Training Readiness score (Garmin’s morning “should I train hard today?” number), HRV Status, wrist-based running power, and full triathlon mode. It’s the watch TechRadar calls “the best running watch for most people” — not beginner-specific, but beginners who train with structure for years grow into it rather than out of it.
At $450 it’s nearly double the 165, so be honest with yourself: if you’ll check your stats after every run and geek out over training load charts, it’s worth it. If you just want to follow a plan and finish, the 165 does that for $200 less. Battery is 13 days / 20 hours GPS — plenty for any marathon.
Training with it: This is where the 265 earns its premium. The morning Training Readiness score synthesizes your sleep, HRV, training history, and recovery into one number — beginners love it because it answers “should I push today?” without requiring sports-science knowledge. HRV Status tracks your autonomic balance over weeks, catching overtraining before you feel it. Wrist running power gives you a wind-independent effort metric for hilly courses.
Skip it if: you are honest that you won\u2019t look at readiness scores or HRV trends. The 165 tracks the same runs for $200 less. Also skip if you need maps — that\u2019s the 965\u2019s territory.
✅ Strengths
- Full Garmin analytics (Readiness, HRV, power)
- Multi-band GPS with SatIQ
- Triathlon mode for future goals
- Offline Spotify/Deezer/Amazon Music
- 8GB storage, Garmin Pay
❌ Weaknesses
- $200 more than the 165
- No built-in maps (that’s the 965)
- Overkill if you just want to finish
- 47g — heaviest non-premium pick
5. Garmin Forerunner 55 — Best Budget
💰 Our budget pick: Frequently on sale around $149, the Forerunner 55 is the “gold standard for first-time marathoners” (Half Marathon Training Plan) — a pure running tool with zero distractions and a 20-hour GPS battery.
The 55 is refreshingly honest about what it is: a running watch, not a smartwatch. The 1.04-inch MIP display is button-only (no touchscreen), basic but perfectly readable in direct sunlight — the display tech that still rules the ultrarunning world. You get Garmin Coach’s free training plans (5K through half marathon, adaptable toward marathon), Daily Suggested Workouts, PacePro, race predictor, and VO2 max.
What’s missing: music storage, altimeter, NFC payments, touchscreen. None of it matters for finishing a marathon. At 37 grams it’s among the lightest here, and 14 days of smartwatch battery / 20 hours GPS means it will outlast your longest training run several times over.
One buying note: at $200 MSRP it’s close enough to the 165’s $250 that the AMOLED upgrade is worth stretching for if you can. But at its frequent $149 sale price, the 55 is simply the best value in running watches, full stop.
Training with it: The 55 is the ultimate “shut up and run” watch. Garmin Coach walks you through your plan with simple on-screen prompts — no metrics rabbit holes to fall into. The button interface works with sweaty hands and gloves, and the MIP display is actually more readable than AMOLED in harsh midday sun. It does the fundamentals (distance, pace, HR zones, suggested workouts) as well as watches triple its price.
Skip it if: you want a touchscreen, music, or anything resembling a smartwatch. And if it is selling at full $200 MSRP, seriously consider stretching to the 165.
✅ Strengths
- Often $149 — unbeatable value
- 20h GPS, 14-day battery
- Free Garmin Coach plans included
- 37g, sunlight-readable display
- Zero distractions — pure running
❌ Weaknesses
- Button-only, basic display
- No music, no altimeter, no NFC
- Single-band GPS
- At $200, the 165 is a big step up
6. Garmin Forerunner 965 — Best Premium “Buy Once”
👑 Our premium pick: Overkill for a first marathon? Honestly, yes. But if you want one watch for the next five years — with full color maps, 31-hour GPS, and every metric Garmin makes — the 965 (now ~$499 street) is the value king of the premium tier since the $750 Forerunner 970 launched.
The 965’s headline feature is full TopoActive color maps on a 1.4-inch AMOLED display — the one thing the 265 can’t do. For road marathoners that’s a luxury; for anyone eyeing trail ultras after their first marathon, it’s the future-proofing that matters. You also get everything in the 265 (Training Readiness, HRV Status, running power, triathlon mode) plus a titanium bezel, 32GB storage, and multi-band GPS with 31 hours of battery (22h in full multi-band).
Versus the newer 970 ($749): you lose the flashlight, mic/speaker, ECG, and the Gen 5 heart-rate sensor. For $250 less, that’s a trade most beginners should happily make. This is the “buy once, cry once” option — and with street prices around $499, it undercuts its own launch price significantly.
Training with it: The 965 is the only watch here with real maps — follow a course line on your wrist instead of memorizing turns, huge for destination marathons and trail ultras later. Everything else is the full Garmin flagship experience: Training Readiness, HRV, running power, 32GB for music, titanium bezel. If your five-year plan includes triathlons or 50Ks, this is the last watch you will need to buy.
Skip it if: this is genuinely your first and possibly only marathon. The 165 or Pace 4 will serve you just as well on race day for half the price — put the savings toward a proper training plan and good shoes.
✅ Strengths
- Full color maps — unique on this list
- 31h GPS battery
- Every Garmin metric available
- Titanium bezel, premium build
- ~$499 street — $250 less than the 970
❌ Weaknesses
- Overkill for a first marathon
- 53g — heaviest on this list
- 47mm only — big wrists preferred
- No flashlight/mic (see 970)
Will It Survive YOUR Marathon? — Battery Check
Enter your expected finish time. We’ll check every watch on this list against the golden rule: rated GPS battery should be ~2× your finish time (covering warmup, cooldown, and battery degradation).
5.0h
*Apple doesn’t publish a workout-mode GPS figure for the SE 3, so we use its 18h total rating with a caution flag — real workout drain is higher than mixed use.
How to Choose: What Actually Matters for Your First Marathon
1. GPS battery: the 2× rule
Your watch must outlast your race comfortably. A 5-hour finisher needs ~10 hours of rated GPS once you add the warmup jog, the walk to the start corral, and the fact that batteries degrade. Every dedicated running watch here (19–41h) clears that bar with room to spare. The Apple Watch SE 3 is the only question mark — fine for most, tight if you’re targeting 5:30+.
2. Wrist heart rate: non-negotiable
Every watch on this list has it. Marathon training lives in heart-rate zones — easy runs easy, workouts hard — and you can’t do that with pace alone on hilly courses or hot days. Don’t buy any watch without it in 2026.
3. A training plan built in
Garmin Coach (free on all four Garmins here) and COROS training plans turn the watch from a tracker into a coach. For a first marathon, this feature is worth more than any sensor upgrade.
4. What you can skip
Multi-band GPS (nice, not necessary for road marathons), offline maps, ECG, blood oxygen, titanium. The $150–$250 tier covers 100% of a beginner’s needs. Spend the savings on shoes.
5. iPhone vs Android changes the answer
Only Apple Watches pair fully with iPhones — Garmins and COROS work with both but can’t answer calls or reply to texts on iOS the way an Apple Watch can. If you’re deep in Apple’s ecosystem and want one device for everything, the SE 3’s compromises may be worth it. If running comes first, Garmin/COROS win.
What the Experts Say
“The best running watch for most beginners in 2026.”
— on the Garmin Forerunner 165
“The gold standard for first-time marathoners.”
— on the Garmin Forerunner 55
“The best running watch for most people” — with the full Garmin analytics suite.
— TechRadar, on the Forerunner 265
Video: Choosing Your First Running Watch
Prefer to watch? This breakdown covers exactly what to look for in a first running watch:
Frequently Asked Questions
What is the best running watch for a first marathon?
The Garmin Forerunner 165 ($250) is the most-recommended pick for 2026: AMOLED display, ~19 hours of GPS, and free Garmin Coach marathon plans. If battery matters most, the COROS PACE 4 ($249) offers 41 hours of GPS at the same price. On the tightest budget, the Forerunner 55 (often $149 on sale) is the classic purist pick.
Do I need GPS for marathon training?
Yes — GPS is the single most important feature. Marathon plans are built on distance and pace (long runs of 18–20 miles, tempo workouts at goal pace), and you can’t follow them accurately without GPS. Every watch on this list has it.
How much GPS battery do I need for a marathon?
Use the 2× rule: your watch’s rated GPS battery should be roughly double your expected finish time. A 4-hour finisher needs ~8 hours; a 6-hour finisher needs ~12. This covers your warmup, the walk to the start, and battery degradation. All the dedicated running watches here (19–41h) clear this easily.
Can I train for a marathon with an Apple Watch SE 3?
Yes, with one caveat. The SE 3 tracks runs well and has all the smartwatch conveniences, but Apple doesn’t publish a workout-mode GPS battery figure — the 18-hour rating is for mixed use. For finish times under ~5 hours it’s fine; beyond 5:30, a Garmin or COROS gives you far more race-day margin for the same money.
Is the COROS PACE 4 better than the Garmin Forerunner 165?
It depends on your priorities. The PACE 4 wins on battery (41h vs 19h GPS) and has dual-band GPS at the same $249 price. The Forerunner 165 wins on ecosystem — a bigger app selection, Garmin Pay, Spotify offline (Music edition), and more third-party integrations. For pure running value, the PACE 4; for the fuller smartwatch-plus-running package, the 165.
Do I need a heart-rate chest strap too?
Not to start. Every watch here has wrist-based heart rate that’s accurate enough for zone-based beginner training. A chest strap (like the Garmin HRM series) is more precise for intervals and racing — consider one for your second marathon, not your first.
Should I buy the Forerunner 265 instead of the 165?
Only if you’ll use the extra analytics. The 265 adds Training Readiness, HRV Status, running power, and multi-band GPS for $200 more. If you love training data and plan to train with structure for years, it’s worth it. If you just want to follow a plan and finish your first marathon, the 165 does everything you need.
When should I buy my marathon watch?
At the start of your training block — ideally 16–20 weeks before race day. You want months of baseline data (resting heart rate, VO2 max estimates, training load) so the watch’s coaching features actually know you by race day. Don’t buy it the week before the marathon.
Keep Reading: Our Full Watch Reviews
Want the deep dive on any of these watches? We have reviewed the key players in detail:
- Apple Watch Series 12 Review — the flagship Apple option, if you outgrow the SE 3
- Apple Watch Ultra 4 Review — for runners who want Apple’s ultimate endurance watch
- Apple Watch Ultra 3 Review — still excellent and often discounted
- Garmin Forerunner 970 Review — Garmin’s 2026 flagship, the 965’s successor
- Garmin Forerunner 170 Music Review — the 165’s music-focused sibling
- Best Smartwatches for Runners 2026 — the full roundup beyond marathon beginners
- Apple Watch vs Garmin 2026 — the ecosystem decision, explained
What\u2019s the difference between the Forerunner 165 and 265?
About $200 and a tier of analytics. The 265 adds multi-band GPS, Training Readiness, HRV Status, running power, and triathlon mode. The 165 has the same AMOLED display, the same ~19-hour GPS battery class, and the same free Garmin Coach plans. For a first marathon, the 165 is enough \u2014 the 265 is for runners who know they\u2019ll obsess over the data.
Is COROS or Garmin better for beginners?
Garmin has the bigger ecosystem: more apps, Garmin Pay, Spotify offline, and deeper third-party integrations. COROS wins on battery life per dollar and simplicity \u2014 the interface is cleaner and the 41-hour GPS of the Pace 4 is unmatched under $300. Beginners who want a \u201cjust works\u201d running tool often prefer COROS; beginners who want the full smartwatch-plus-fitness package prefer Garmin.
Can a smartwatch replace a running watch for marathon training?
For most beginners, yes \u2014 with caveats. The Apple Watch SE 3 tracks runs accurately and has the best smartwatch features, but its battery needs daily charging and Apple doesn\u2019t publish a workout-mode GPS figure. A dedicated Garmin or COROS lasts 1\u20132 weeks per charge, has physical buttons that work with sweaty hands, and offers structured training plans. If running is the priority, buy the running watch.
References
- Garmin — Forerunner 165 official specifications (garmin.com)
- Garmin — Forerunner 265 / 265S official specifications (garmin.com)
- Garmin — Forerunner 55 official specifications (garmin.com)
- Garmin — Forerunner 965 official specifications (garmin.com)
- COROS — PACE 4 official product page (coros.com)
- Apple — Apple Watch SE 3 technical specifications (apple.com)
- Tom’s Guide — COROS PACE 4 review; “best running watch for beginners” Editor’s Choice (Forerunner 55)
- TechRadar — Forerunner 165 review; Forerunner 265 “best running watch for most people”
- Wareable — Forerunner 165 “top recommendation for beginners in 2026”
- the5krunner — COROS PACE 4 review (November 2025)
