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Description
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.
Get an overview of your sleep, HRV status and daily workout with morning report.
Charge less, train more with up to 14 days of battery life in smartwatch mode and up to 30 hours in GPS mode.
Push your limits with a built-in triathlon feature and 30+ activity profiles.
Plan your strategy with daily suggested workouts, course details and more on the race widget.
Utilize a full suite of advanced metrics and training tools to reach your goals.
Pay for your post-workout coffee with Garmin Pay™ contactless payments1.
READY FOR THE LONG RUN
Get an uninterrupted picture of your daily health and nightly sleep with up to 14 days of battery life in smartwatch mode and up to 30 hours in GPS mode.
(ALMOST) AS LIGHT AS A FEATHER
With its sleek design and 1.7 oz weight, you’ll almost forget you’re wearing Forerunner 255 — 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 255 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® 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 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.
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.
See your stats, and track your goals in our Garmin Connect™ online community.
General
Lens MaterialCorning® Gorilla® Glass 3Bezel Materialfiber-reinforced polymerQuick Release bandsyes (22 mm, Industry standard)Strap materialsiliconePhysical size45.6 x 45.6 x 12.9 (mm)
Fits wrists with a circumference of 130-205 mmColor displayDisplay Size1.3" (33 mm) diameterDisplay resolution260 x 260 pixelsDisplay Typesunlight-visible, transflective memory-in-pixel (MIP)Weight49 gBattery lifeSmartwatch 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 DetailsWater rating5 ATMMemory/History4 GB
Clock Features
Time/dateGPS Time SyncAutomatic daylight saving timeAlarm clockTimerStopwatchSunrise/sunset times
Health Monitoring
Wrist-based Heart Rate (constant, every second)Daily Resting Heart RateAbnormal Heart Rate Alertsyes (high and low)Respiration rate (24x7)Pulse Ox Blood Oxygen Saturationyes (spot-check, and optional all-day acclimation and in sleep)Fitness AgeBody Battery™ Energy MonitorAll-day StressRelaxation breathing timerSleepyes (advanced)Sleep score and insightsHydrationyes (in Garmin Connect™ and optional Connect IQ™ widget)Women's Healthyes (in Garmin Connect™ and optional Connect IQ™ widget)Health snapshot
Sensors
GPSGLONASSGalileoMulti-frequency PositioningGarmin Elevate™ wrist heart rate monitorBarometric altimeterCompassGyroscopeAccelerometerThermometerPulse Ox Blood Oxygen Saturation Monitor
Daily Smart Features
ConnectivityBluetooth®, ANT+®Connect IQ™ (downloadable watch faces, data fields, widgets and apps)On-device Connect IQ™ StoreSmart NotificationsText response/reject phone call with text (Android™ only) CalendarWeatherRealtime settings sync with Garmin Connect™ mobileBattery saver (customizable low power watch)Controls smartphone musicFind My PhoneFind My WatchVIRB® RemoteSmartphone compatibilityiPhone® and Android™Pairs with Garmin Connect™ MobileGarmin Pay™
Safety and Tracking Features
LiveTrackLive Event SharingAndroid™ OnlyIncident Detection during select activitiesAssistance
Activity Tracking Features
Step counterMove bar (displays on 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)Calories burnedFloors climbedDistance traveledIntensity minutesTrueUp™Move IQ™Garmin Connect™ Challenges appyes (optional Connect IQ app)
Gym & Fitness Equipment
Available gym activity profilesStrength, HIIT, Cardio and Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Pilates, YogaCardio workoutsStrength workoutsHIIT workoutsYoga workoutsPilates workoutsOn-screen workout animationsOn-screen workout muscle mapsAutomatic rep counting
Training, Planning and Analysis Features
HR zonesHR alertsHR calories% HR max% HRRRecovery timeAuto max HRMorning reportRace glance/widgetHRV statusHR Broadcast (broadcasts HR data over ANT+™ to paired devices)Respiration rate (during exercise)yes (with compatible accessory)GPS speed and distanceCustomizable data pagesCustomizable activity profilesAuto Pause®Interval trainingImproved interval (includes open repeats, intervals data page, rest screen and auto detection)Advanced workoutsDownloadable training plansAuto Lap®Manual lapRest timerConfigurable lap alertsVO2 Max (Run)VO2 Max (Trail Run)Training StatusimprovedTraining LoadTraining load focusTraining EffectTraining Effect (anaerobic)Primary benefit (Training Effect labels)Improved recovery timeDaily suggested workoutsyes (7 days)Custom alertsAudio promptsFinish timeVirtual PartnerRace an ActivityAuto multisport activitiesManual multisport activitiesCourse guidanceTouch and/or button lockAuto scrollActivity history on watchPhysio TrueUp
Running Features
Available run profilesRunning, Outdoor Track Running, Treadmill Running, Indoor Track Running, Trail Running, Virtual Running, Ultra RunningGPS-based distance, time and paceRunning dynamicsyes (with compatible accessory)Vertical oscillation and ratioyes (with compatible accessory)Ground contact time and balanceyes (with compatible accessory)Stride length (real time)yes (with compatible accessory)Cadence (provides real-time number of steps per minute)Running poweryes (with compatible accessory)Performance conditionLactate thresholdyes (with compatible accessory)PacePro™ Pacing StrategiesRun workoutsTrail run auto climbRace predictorCourse- and weather-specific race predictorFoot pod capable
Outdoor Recreation
Available outdoor recreation profilesHiking, Skiing, Snowboarding, XC Classic Skiing, Stand Up Paddleboarding, RowingPoint-to-point navigationBread crumb trail in real timeBack to startTracBack®UltraTrac modeUp AheadElevation profile Distance to destinationBarometric trend indicator with Storm AlertVertical speedTotal ascent/descentFuture elevation plotProjected waypointSun and moon information
Cycling Features
Available cycling profilesBiking, Indoor Biking, Mountain Biking, eBiking, eMountain BikingAlerts (triggers alarm when you reach goals including time, distance, heart rate or calories)CoursesBike lap and lap maximum power (with power sensor)Race an activityFTP (Functional Threshold Power)yes (with compatible accessory)Compatible with Vector™ and Rally™ (power meters)Power meter compatibleCompatible with Varia Vision™ (head-mounted display)Compatible with Varia™ radar (rear-facing radar)Compatible with Varia™ lightsSpeed and cadence sensor support (w/sensor)
Swimming Features
Available swim profilesPool Swimming, Open Water SwimmingOpen-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 alertsPacing alerts (pool swim only) Countdown start (pool swim only)Pool swim workoutsCritical swim speedUnderwater wrist-based heart rateHeart 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
Toe-to-Toe™ Challenges appyes (optional Connect IQ Toe-to-Toe™ Challenges app)