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Run at A Higher Level
You’re making strides. Now, let’s take the next step. Get the training and recovery insights you’ll need to notch your best time yet.
Ready for The Long Run
Get an uninterrupted picture of your daily health and nightly sleep with up to 12 days of battery life in smartwatch mode and up to 26 hours in GPS mode.
As Light as A Feather
With its sleek design and 39g weight, you’ll almost forget you’re wearing Forerunner 255S — even when you’re asleep.
Featuring easy-to-use buttons and a silicone band, this watch is ready to wear — and tear — with durable Corning Gorilla Glass 3.
Receive an overview of your sleep, recovery, and training outlook as soon as you wake up — alongside HRV status and weather. You can even customize your report to show you what you want to see.
Gain a deeper understanding of your overall health, recovery, and training performance through heart rate variability while you sleep, based on technology developed by our Firstbeat Analytics team.
Built-In Sports Apps
Tap into 30+ built-in activities, including the triathlon and open-water swimming profiles — new to the Forerunner 255 series. For races and brick workouts, transition to the next activity with a single button press.
Get ready for your next race with training tips, personalized daily suggested workouts, and completion time predictions based on course details, weather, and performance.
Daily Suggested Workouts
View your entire week of daily suggested workouts, which adapt after every run to match your performance and recovery as well as the races coming up in your Garmin Connect smartphone app calendar.
Free adaptive training plans include 5K, 10K, and half-marathon programs, featuring guidance from expert coaches that adapt to you and your goals.
When using a Running Dynamics Pod or HRM-Pro monitor, get a continuous measurement on your wrist of how much power you’re applying to the road as you run, so you can manage your effort.
Know how long to recover before your next high-effort workout based on your latest training as well as overall stress, sleep, and daily activities outside of workouts.
Pace Pro Feature
To help you plan your race day strategy, this feature offers GPS-based pace guidance for a selected course or distance, so you can tailor your efforts to what’s ahead.
Using new indicators such as HRV status, your recent exercise history, and performance, get easy insight into your overall effort — and whether you’re training productively, peaking, or strained.
See your training history, and compare the intensity of your recent workouts to the optimal range to help improve your fitness.
See how your workouts influence your endurance, speed, and power with aerobic and anaerobic training effect feedback.
While you run, get an analysis of your pace and heart rate for a real-time assessment of your current ability to perform.
When using a Running Dynamics Pod or HRM-Pro monitor, the Forerunner 255S watch measures crucial running metrics such as cadence, stride length, ground contact time and balance, and more — while comparing to others in the Garmin Connect app.
Create or find existing courses in the Garmin Connect app, so you’ll never run out of places to run. Or plan one on other platforms such as Strava and Komoot, then automatically sync them to your Forerunner.
Visual Race Predictor
Based on your running history and overall fitness level, get an estimate of what your pace could be for a 5K, 10K — or even a marathon. Plus, trend data highlights your training’s impact over time.
Mix up your training with different types of workouts. Free HIIT, strength, cardio, yoga, and Pilates workouts come preloaded on the watch, and you can download more from the Garmin Connect app.
Wrist-Based Heart Rate
The watch constantly samples your heart rate1 with our latest-generation heart rate sensor and will alert you if it stays too high or too low while you’re at rest. It also helps gauge how hard you work during activities — even while swimming.
Body Battery Energy Monitoring
Track your body’s energy levels so you can find the best times for activity and rest1.
Sleep Score and Advanced Sleep Monitoring
Get a score for your sleep quality and insights on how you can do better. Even keep track of the different sleep stages as well as heart rate, stress, Pulse Ox2, and respiration.
Pulse OX Sensor
This wrist-based Pulse Ox sensor2 monitors blood oxygen saturation levels to support advanced sleep monitoring and altitude acclimation.
Women’s Health Tracking
Use the Garmin Connect app to track your menstrual cycle or pregnancy. Log symptoms, get exercise and nutrition education, and more. Even see and log details on your wrist with the Women’s Health Tracking app.
Our intensity minutes feature tells you when during the day you earned them and during what activity.
Find out if you’re having a calm, balanced or stressful day. Relax reminders will even prompt you to do a short breathing activity when the watch detects that you’re feeling stressed.
Health Snapshot Feature
Log a 2-minute session to record key stats, including heart rate1, heart rate variability, Pulse Ox2, respiration, and stress. Then generate a report with those stats to share via the Garmin Connect app on your compatible smartphone.
Multi-Band GNSS Support
Access multiple global navigation satellite systems, and get access to multiple frequencies sent by navigation satellites for improved accuracy in areas where GNSS signals are reflected, weak, or typically don't penetrate — giving you superior accuracy for how far and how fast you’ve run — even in challenging environments.
Receive emails, texts, and alerts right on your watch when paired with your Apple or Android smartphone. You can even respond to texts if you have an Android phone.
Safety and Tracking Features
If you feel unsafe or if your watch senses that an incident occurred, the Assistance and incident detection features3 send your location to emergency contacts. Incident detection is enabled by default for select activity profiles only.
Live track Feature
Use LiveTrack to let friends and family follow your real-time location3 and even view your entire preplanned course. Rest assured that your loved ones know exactly where you’re running.
Garmin Connect App
See your health and fitness information, connect and compete with friends, sign up for challenges to earn badges, and more — all in one free, zero-subscription app.
Connect IQ Store
Download custom watch faces, add data fields, and get apps and widgets from the Connect IQ Store app downloaded on your compatible smartphone.
|Lens Material||Corning Gorilla Glass 3|
|Bezel Material||fiber-reinforced polymer|
|Quick Release bands||(18 mm, Industry standard)|
|Physical size||41 x 41 x 12.4 (mm)
Fits wrists with a circumference of 110-175 mm
|Display Size||1.1" (27.5mm) Diameter|
|Display resolution||218 x 218 pixels|
|Display Type||sunlight-visible, transflective memory-in-pixel (MIP)|
|Battery life||Smartwatch mode: Up to 12 days
GPS-only GNSS mode: Up to 26 hours
All-Systems GNSS mode: Up to 20 hours
All-Systems GNSS mode plus Multi-Band: Up to 13 hours
|Water rating||5 ATM|
|GPS Time Sync||✓|
|Automatic daylight saving time||✓|
|Wrist-based Heart Rate (constant, every second)||✓|
|Daily Resting Heart Rate||✓|
|Abnormal Heart Rate Alerts||(high and low)|
|Respiration rate (24/7)||✓|
|Pulse Ox Blood Oxygen Saturation||(spot-check, and optional all-day acclimation and sleep)|
|Body Battery Energy Monitor||✓|
|Relaxation breathing timer||✓|
|Sleep score and insights||✓|
|Hydration||(in Garmin Connect and optional Connect IQ widget)|
|Women's Health||(in Garmin Connect and optional Connect IQ widget)|
|Garmin Elevate wrist heart rate monitor||✓|
|Pulse Ox Blood Oxygen Saturation Monitor||✓|
Daily Smart Features
|Connectivity||Bluetooth, ANT+, Wi-Fi|
|Connect IQ (downloadable watch faces, data fields, widgets, and apps)||✓|
|On-device Connect IQ Store||✓|
|Text response/reject phone call with text (Android only)||✓|
|Realtime settings sync with Garmin Connect mobile||✓|
|Battery saver (customizable low-power watch)||✓|
|Controls smartphone music||✓|
|Find My Phone||✓|
|Find My Watch||✓|
|Smartphone compatibility||iPhone and Android|
|Pairs with Garmin Connect Mobile||✓|
Safety and Tracking Features
|Live Event Sharing||Android Only|
|Incident Detection during select activities||✓|
Activity Tracking Features
|Move bar (displays on the device after a period of inactivity; walk for a couple of minutes to reset it)||✓|
|Auto goal (learns your activity level and assigns a daily step goal)||✓|
|Garmin Connect Challenges app||(optional Connect IQ app)|
Gym & Fitness Equipment
|Available gym activity profiles||Strength, HIIT, Cardio, and Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Pilates, Yoga|
|On-screen workout animations||✓|
|On-screen workout muscle maps||✓|
Training, Planning, and Analysis Features
|% HR max||✓|
|Auto max HR||✓|
|HR Broadcast (broadcasts HR data over ANT+ to paired devices)||✓|
|Respiration rate (during exercise)||(with compatible accessory)|
|GPS speed and distance||✓|
|Customizable data pages||✓|
|Customizable activity profiles||✓|
|Improved interval (includes open repeats, intervals data page, rest screen and auto-detection)||✓|
|Downloadable training plans||✓|
|Configurable lap alerts||✓|
|VO2 Max (Run)||✓|
|VO2 Max (Trail Run)||✓|
|Training load focus||✓|
|Training Effect (anaerobic)||✓|
|Primary benefit (Training Effect labels)||✓|
|Improved recovery time||✓|
|Daily suggested workouts||(7 days)|
|Race an Activity||✓|
|Auto multisport activities||✓|
|Manual multisport activities||✓|
|Touch and/or button lock||✓|
|Activity history on the watch||✓|
|Available run profiles||Running, Outdoor Track Running, Treadmill Running, Indoor Track Running, Trail Running, Virtual Running, Ultra Running|
|GPS-based distance, time, and pace||✓|
|Running dynamics||(with compatible accessory)|
|Vertical oscillation and ratio||(with compatible accessory)|
|Ground contact time and balance||(with compatible accessory)|
|Stride length (real-time)||(with compatible accessory)|
|Cadence (provides a real-time number of steps per minute)||✓|
|Running power||(with compatible accessory)|
|Lactate threshold||(with compatible accessory)|
|Pace Pro Pacing Strategies||✓|
|Course- and weather-specific race predictor||✓|
|Foot pod capable||✓|
|Available outdoor recreation profiles||Hiking, Skiing, Snowboarding, XC Classic Skiing, Stand Up Paddleboarding, Rowing|
|Breadcrumb trail in real time||✓|
|Back to start||✓|
|Distance to destination||✓|
|Barometric trend indicator with Storm Alert||✓|
|Trail run auto climb||✓|
|Future elevation plot||✓|
|Sun and moon information||✓|
|Available cycling profiles||Biking, Indoor Biking, Mountain Biking, ebiking, eMountain Biking|
|Alerts (triggers an alarm when you reach goals including time, distance, heart rate, or calories)||✓|
|Bike lap and lap maximum power (with power sensor)||✓|
|Race an activity||✓|
|FTP (Functional Threshold Power)||(with compatible accessory)|
|Compatible with Vector and Rally (power meters)||✓|
|Power meter compatible||✓|
|Compatible with Varia Vision (head-mounted display)||✓|
|Compatible with Varia radar (rear-facing radar)||✓|
|Compatible with Varia lights||✓|
|Speed and cadence sensor support (w/sensor)||✓|
|Available swim profiles||Pool Swimming, Open Water Swimming|
|Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, swim efficiency (SWOLF), calories)||✓|
|Pool swim metrics (lengths, distance, pace, stroke count, swim efficiency (SWOLF), calories)||✓|
|Stroke type detection (freestyle, backstroke, breaststroke, butterfly) (pool swim only)||✓|
|Drill logging (pool swim only)||✓|
|Basic rest timer (up from 0) (pool swim only)||✓|
|"Repeat on" rest timer (pool swim only)||✓|
|Auto rest (pool swim only)||✓|
|Time and distance alerts||✓|
|Pacing alerts (pool swim only)||✓|
|Countdown start (pool swim only)||✓|
|Pool swim workouts||✓|
|Critical swim speed||✓|
|Underwater wrist-based heart rate||✓|
|Heart rate from external HRM (real-time during rests, interval and session stats during rests, and automatic heart rate download post-swim)||(with HRM-Swim or HRM-Pro)|
Kid Activity Tracking Features
|Toe-to-Toe Challenges app||(optional Connect IQ Toe-to-Toe Challenges app)|
|Smart trainer control||✓|
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