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.
(ALMOST) AS LIGHT AS A FEATHER
With its sleek design and 1.4 oz weight, you’ll almost forget you’re wearing Forerunner 255S — even when you’re asleep.
SWEAT-READY MATERIALS
Featuring easy-to-use buttons and a silicone band, this watch is ready to wear — and tear — with durable Corning® Gorilla® Glass 3.
Light on the wrist. Not on features.
MORNING REPORT
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.
HRV STATUS
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.
RACE WIDGET
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.
GARMIN COACH
Free adaptive training plans include 5K, 10K and half-marathon programs, featuring guidance from expert coaches that adapt to you and your goals.
RUNNING POWER
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.
RECOVERY TIME
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.
PACEPRO™ 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.
TRAINING STATUS
Using new indicators such as HRV status, your recent exercise history and performance, get an easy insight into your overall effort — and whether you’re training productively, peaking or strained.
ACUTE LOAD
See your training history, and compare the intensity of your recent workouts to the optimal range to help improve your fitness.
TRAINING EFFECT
See how your workouts influence your endurance, speed and power with aerobic and anaerobic training effect feedback.
PERFORMANCE CONDITION
While you run, get an analysis of your pace and heart rate for a real-time assessment of your current ability to perform.
RUNNING DYNAMICS
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.
COURSES
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.
CROSS-TRAINING
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.
A depth of wellness insights.
WRIST-BASED HEART RATE
The watch constantly samples your heart rate2 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 rest2.
IMPROVED SLEEP MONITORING AND SLEEP SCORE
Understand how your body is recovering — and get ready for training — with our improved sleep monitoring feature. After waking up, you’ll receive a sleep score, as well as breakdown of your sleep stages, Pulse Ox3 and respiration, alongside detailed insights for improved sleep quality.
PULSE OX SENSOR
This wrist-based Pulse Ox sensor3 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.
INTENSITY MINUTES
Our intensity minutes feature tells you when during the day you earned them and during what activity.
STRESS TRACKING
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 rate2, heart rate variability, Pulse Ox3, respiration and stress. Then generate a report with those stats to share via the Garmin Connect app on your compatible smartphone.
Stay connected at every step.
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.
GARMIN PAY CONTACTLESS PAYMENTS
Breeze through checkout lines with Garmin Pay contactless payments1 through participating providers.
SMART NOTIFICATIONS
Receive emails, texts and alerts right on your watch when paired with your Apple® 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 features4 send your location to emergency contacts. Incident detection is enabled by default for select activity profiles only.
LIVETRACK FEATURE
Use LiveTrack to let friends and family follow your real-time location4 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.
General
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LENS MATERIAL |
Corning® Gorilla® Glass 3
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BEZEL MATERIAL |
fiber-reinforced polymer
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QUICK RELEASE BANDS |
yes (22 mm, Industry standard) |
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STRAP MATERIAL |
silicone
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PHYSICAL SIZE |
45.6 x 45.6 x 12.9 (mm)
Fits wrists with a circumference of 130-205 mm
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COLOR DISPLAY |
yes |
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DISPLAY SIZE |
1.3" (33 mm) diameter |
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DISPLAY RESOLUTION |
260 x 260 pixels |
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DISPLAY TYPE |
sunlight-visible, transflective memory-in-pixel (MIP) |
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WEIGHT |
49 g
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BATTERY LIFE |
Smartwatch mode: Up to 14 days
GPS-Only GNSS mode: Up to 30 hours
All-Systems GNSS mode: Up to 25 hours
All-Systems GNSS mode plus Multi-Band: Up to 16 hours
See Details
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WATER RATING |
5 ATM |
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MEMORY/HISTORY |
4 GB |
Clock Features
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TIME/DATE |
yes |
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GPS TIME SYNC |
yes |
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AUTOMATIC DAYLIGHT SAVING TIME |
yes |
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ALARM CLOCK |
yes |
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TIMER |
yes |
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STOPWATCH |
yes |
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SUNRISE/SUNSET TIMES |
yes |
Health Monitoring
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WRIST-BASED HEART RATE (CONSTANT, EVERY SECOND) |
yes |
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DAILY RESTING HEART RATE |
yes |
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ABNORMAL HEART RATE ALERTS |
yes (high and low) |
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RESPIRATION RATE (24X7) |
yes |
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PULSE OX BLOOD OXYGEN SATURATION |
yes (spot-check, and optional all-day acclimation and in sleep) |
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FITNESS AGE |
yes |
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BODY BATTERY™ ENERGY MONITOR |
yes |
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ALL-DAY STRESS |
yes |
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RELAXATION BREATHING TIMER |
yes |
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SLEEP |
yes (advanced) |
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SLEEP SCORE AND INSIGHTS |
yes |
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HYDRATION |
yes (in Garmin Connect™ and optional Connect IQ™ widget) |
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WOMEN'S HEALTH |
yes (in Garmin Connect™ and optional Connect IQ™ widget) |
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HEALTH SNAPSHOT |
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Sensors
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GPS |
yes |
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GLONASS |
yes |
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GALILEO |
yes |
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MULTI-FREQUENCY POSITIONING |
yes |
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GARMIN ELEVATE™ WRIST HEART RATE MONITOR |
yes |
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BAROMETRIC ALTIMETER |
yes |
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COMPASS |
yes |
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GYROSCOPE |
yes |
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ACCELEROMETER |
yes |
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THERMOMETER |
yes |
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PULSE OX BLOOD OXYGEN SATURATION MONITOR |
yes |
Daily Smart Features
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CONNECTIVITY |
Bluetooth®, ANT+® |
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CONNECT IQ™ (DOWNLOADABLE WATCH FACES, DATA FIELDS, WIDGETS AND APPS) |
yes |
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ON-DEVICE CONNECT IQ™ STORE |
yes |
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SMART NOTIFICATIONS |
yes |
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TEXT RESPONSE/REJECT PHONE CALL WITH TEXT (ANDROID™ ONLY) |
yes |
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CALENDAR |
yes |
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WEATHER |
yes |
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REALTIME SETTINGS SYNC WITH GARMIN CONNECT™ MOBILE |
yes |
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BATTERY SAVER (CUSTOMIZABLE LOW POWER WATCH) |
yes |
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CONTROLS SMARTPHONE MUSIC |
yes |
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FIND MY PHONE |
yes |
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FIND MY WATCH |
yes |
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VIRB® REMOTE |
yes |
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SMARTPHONE COMPATIBILITY |
iPhone® and Android™ |
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PAIRS WITH GARMIN CONNECT™ MOBILE |
yes |
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GARMIN PAY™ |
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Safety and Tracking Features
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LIVETRACK |
yes |
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LIVE EVENT SHARING |
Android™ Only |
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INCIDENT DETECTION DURING SELECT ACTIVITIES |
yes |
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ASSISTANCE |
yes |
Activity Tracking Features
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STEP COUNTER |
yes |
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MOVE BAR (DISPLAYS ON DEVICE AFTER A PERIOD OF INACTIVITY; WALK FOR A COUPLE OF MINUTES TO RESET IT) |
yes |
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AUTO GOAL (LEARNS YOUR ACTIVITY LEVEL AND ASSIGNS A DAILY STEP GOAL) |
yes |
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CALORIES BURNED |
yes |
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FLOORS CLIMBED |
yes |
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DISTANCE TRAVELED |
yes |
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INTENSITY MINUTES |
yes |
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TRUEUP™ |
yes |
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MOVE IQ™ |
yes |
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GARMIN CONNECT™ CHALLENGES APP |
yes (optional Connect IQ app) |
Gym & Fitness Equipment
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AVAILABLE GYM ACTIVITY PROFILES |
Strength, HIIT, Cardio and Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Pilates, Yoga |
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CARDIO WORKOUTS |
yes |
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STRENGTH WORKOUTS |
yes |
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HIIT WORKOUTS |
yes |
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YOGA WORKOUTS |
yes |
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PILATES WORKOUTS |
yes |
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ON-SCREEN WORKOUT ANIMATIONS |
yes |
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ON-SCREEN WORKOUT MUSCLE MAPS |
yes |
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AUTOMATIC REP COUNTING |
yes |
Training, Planning and Analysis Features
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HR ZONES |
yes |
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HR ALERTS |
yes |
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HR CALORIES |
yes |
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% HR MAX |
yes |
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% HRR |
yes |
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RECOVERY TIME |
yes |
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AUTO MAX HR |
yes |
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MORNING REPORT |
yes |
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RACE GLANCE/WIDGET |
yes |
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HRV STATUS |
yes |
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HR BROADCAST (BROADCASTS HR DATA OVER ANT+™ TO PAIRED DEVICES) |
yes |
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RESPIRATION RATE (DURING EXERCISE) |
yes (with compatible accessory) |
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GPS SPEED AND DISTANCE |
yes |
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CUSTOMIZABLE DATA PAGES |
yes |
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CUSTOMIZABLE ACTIVITY PROFILES |
yes |
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AUTO PAUSE® |
yes |
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INTERVAL TRAINING |
yes |
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IMPROVED INTERVAL (INCLUDES OPEN REPEATS, INTERVALS DATA PAGE, REST SCREEN AND AUTO DETECTION) |
yes |
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ADVANCED WORKOUTS |
yes |
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DOWNLOADABLE TRAINING PLANS |
yes |
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AUTO LAP® |
yes |
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MANUAL LAP |
yes |
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REST TIMER |
yes |
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CONFIGURABLE LAP ALERTS |
yes |
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VO2 MAX (RUN) |
yes |
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VO2 MAX (TRAIL RUN) |
yes |
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TRAINING STATUS |
improved |
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TRAINING LOAD |
yes |
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TRAINING LOAD FOCUS |
yes |
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TRAINING EFFECT |
yes |
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TRAINING EFFECT (ANAEROBIC) |
yes |
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PRIMARY BENEFIT (TRAINING EFFECT LABELS) |
yes |
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IMPROVED RECOVERY TIME |
yes |
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DAILY SUGGESTED WORKOUTS |
yes (7 days) |
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CUSTOM ALERTS |
yes |
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AUDIO PROMPTS |
yes |
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FINISH TIME |
yes |
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VIRTUAL PARTNER |
yes |
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RACE AN ACTIVITY |
yes |
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AUTO MULTISPORT ACTIVITIES |
yes |
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MANUAL MULTISPORT ACTIVITIES |
yes |
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COURSE GUIDANCE |
yes |
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TOUCH AND/OR BUTTON LOCK |
yes |
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AUTO SCROLL |
yes |
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ACTIVITY HISTORY ON WATCH |
yes |
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PHYSIO TRUEUP |
yes |
Running Features
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AVAILABLE RUN PROFILES |
Running, Outdoor Track Running, Treadmill Running, Indoor Track Running, Trail Running, Virtual Running, Ultra Running
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GPS-BASED DISTANCE, TIME AND PACE |
yes |
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RUNNING DYNAMICS |
yes (with compatible accessory) |
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VERTICAL OSCILLATION AND RATIO |
yes (with compatible accessory) |
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GROUND CONTACT TIME AND BALANCE |
yes (with compatible accessory) |
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STRIDE LENGTH (REAL TIME) |
yes (with compatible accessory) |
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CADENCE (PROVIDES REAL-TIME NUMBER OF STEPS PER MINUTE) |
yes |
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RUNNING POWER |
yes (with compatible accessory) |
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PERFORMANCE CONDITION |
yes |
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LACTATE THRESHOLD |
yes (with compatible accessory) |
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PACEPRO™ PACING STRATEGIES |
yes |
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RUN WORKOUTS |
yes |
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TRAIL RUN AUTO CLIMB |
yes |
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RACE PREDICTOR |
yes |
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COURSE- AND WEATHER-SPECIFIC RACE PREDICTOR |
yes |
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FOOT POD CAPABLE |
yes |
Outdoor Recreation
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AVAILABLE OUTDOOR RECREATION PROFILES |
Hiking, Skiing, Snowboarding, XC Classic Skiing, Stand Up Paddleboarding, Rowing
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POINT-TO-POINT NAVIGATION |
yes |
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BREAD CRUMB TRAIL IN REAL TIME |
yes |
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BACK TO START |
yes |
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TRACBACK® |
yes |
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ULTRATRAC MODE |
yes |
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UP AHEAD |
yes |
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ELEVATION PROFILE |
yes |
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DISTANCE TO DESTINATION |
yes |
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BAROMETRIC TREND INDICATOR WITH STORM ALERT |
yes |
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VERTICAL SPEED |
yes |
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TOTAL ASCENT/DESCENT |
yes |
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FUTURE ELEVATION PLOT |
yes |
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PROJECTED WAYPOINT |
yes |
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SUN AND MOON INFORMATION |
yes |
Cycling Features
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AVAILABLE CYCLING PROFILES |
Biking, Indoor Biking, Mountain Biking, eBiking, eMountain Biking
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ALERTS (TRIGGERS ALARM WHEN YOU REACH GOALS INCLUDING TIME, DISTANCE, HEART RATE OR CALORIES) |
yes |
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COURSES |
yes |
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BIKE LAP AND LAP MAXIMUM POWER (WITH POWER SENSOR) |
yes |
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RACE AN ACTIVITY |
yes |
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FTP (FUNCTIONAL THRESHOLD POWER) |
yes (with compatible accessory) |
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COMPATIBLE WITH VECTOR™ AND RALLY™ (POWER METERS) |
yes |
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POWER METER COMPATIBLE |
yes |
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COMPATIBLE WITH VARIA VISION™ (HEAD-MOUNTED DISPLAY) |
yes |
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COMPATIBLE WITH VARIA™ RADAR (REAR-FACING RADAR) |
yes |
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COMPATIBLE WITH VARIA™ LIGHTS |
yes |
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SPEED AND CADENCE SENSOR SUPPORT (W/SENSOR) |
yes |
Swimming Features
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AVAILABLE SWIM PROFILES |
Pool Swimming, Open Water Swimming
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OPEN-WATER SWIM METRICS (DISTANCE, PACE, STROKE COUNT/RATE, STROKE DISTANCE, SWIM EFFICIENCY (SWOLF), CALORIES) |
yes |
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POOL SWIM METRICS (LENGTHS, DISTANCE, PACE, STROKE COUNT, SWIM EFFICIENCY (SWOLF), CALORIES) |
yes |
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STROKE TYPE DETECTION (FREESTYLE, BACKSTROKE, BREASTSTROKE, BUTTERFLY) (POOL SWIM ONLY) |
yes |
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DRILL LOGGING (POOL SWIM ONLY) |
yes |
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BASIC REST TIMER (UP FROM 0) (POOL SWIM ONLY) |
yes |
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"REPEAT ON" REST TIMER (POOL SWIM ONLY) |
yes |
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AUTO REST (POOL SWIM ONLY) |
yes |
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TIME AND DISTANCE ALERTS |
yes |
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PACING ALERTS (POOL SWIM ONLY) |
yes |
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COUNTDOWN START (POOL SWIM ONLY) |
yes |
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POOL SWIM WORKOUTS |
yes |
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CRITICAL SWIM SPEED |
yes |
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UNDERWATER WRIST-BASED HEART RATE |
yes |
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HEART RATE FROM EXTERNAL HRM (REAL-TIME DURING RESTS, INTERVAL AND SESSION STATS DURING RESTS, AND AUTOMATIC HEART RATE DOWNLOAD POST-SWIM) |
yes (with HRM-Swim™ or HRM-Pro™) |
Kid Activity Tracking Features
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TOE-TO-TOE™ CHALLENGES APP |
yes (optional Connect IQ Toe-to-Toe™ Challenges app) |
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