





Garmin Forerunner® 255

Features
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Specifications
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In The Box
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Accessories
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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.

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
Train for an event, achieve a milestone, or improve your fitness with Garmin Coach training plans for running, cycling or strength. Just set it up in the Garmin Connect™ app, then let Garmin Coach create personalized daily workouts to help you reach your goals. This includes Garmin Run and Cycling Coach, which creates training plans that adapt based on your performance, recovery and health metrics. If you’re trying to build muscle or simply increase your fitness level, the strength training plans are tailored to help you optimize your body’s performance and endurance.
TRIATHLON AND MULTISPORT PROFILES
Switch between sports automatically by using built-in profiles for triathlons, duathlons, brick workouts and swimruns – so you can focus on the race and let your watch take care of recording splits. You can also create your own custom multisport profiles.

WRIST-BASED RUNNING DYNAMICS
This smartwatch measures crucial running metrics such as cadence, stride length, ground contact time and more.

WRIST-BASED RUNNING POWER
See how much power you’re applying to the trail or the road so you can manage your effort and fine-tune your training. No accessory required.

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.

GRADE-ADJUSTED PACE
Don’t run out of steam before the activity is over. Understand how to adjust your pace over varying terrain to perform according to your plan.

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.

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.

TRACK RUNNING
Record accurate lap distances and see your distances in meters – even on a track you’ve never run before with a database with more than 10,000 tracks (400 meters) from all over the world.

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. Download free HIIT, strength, cardio, yoga and Pilates workouts to your watch from the Garmin Connect app.

TARGETED ADAPTIVE COACHING FOR CYCLING
View your entire week of daily suggested cycling workouts directly on your smartwatch — which adapt to match your performance and the demands of upcoming events in your Garmin Connect™ smartphone app calendar.
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
See your energy levels throughout the day so you’ll know when your body is charged up and ready for activity or drained and needing to recharge with restful sleep. And get even more details and personal insights on how sleep, naps, daily activities and high stress specifically impact your energy.

SLEEP COACH
Get a sleep score and personalized coaching for how much sleep you need and how you can improve. Keep track of different sleep stages and naps — and see key metrics such as HRV status to better understand your health.

NAP DETECTION
Automatically track or log your naps to see how they benefit your body and to check the recommended time and duration they should be.

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.
What You'll Love |
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Sleep score and insights | |
Battery life (smartwatch mode) | Up to 14 days |
Pulse Ox blood oxygen | yes (spot-check, and optional all-day acclimation and in sleep) |
Garmin Pay™ | |
Multi-band GPS | |
Training status | yes (improved) |
Display type | Sunlight-visible, transflective memory-in-pixel (MIP) |
Water rating | 5 ATM |
General |
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Strap material | silicone |
Lens Material | Corning® Gorilla® Glass 3 |
Bezel Material | fiber-reinforced polymer |
Quick Release bands | yes (22 mm, Industry standard) |
Physical size | 45.6 x 45.6 x 12.9 (mm) Fits wrists with a circumference of 130-205 mm |
Weight | 49 g |
Display Size | 1.3 (33 mm) diameter |
Display resolution | 260 x 260 pixels |
Color display | |
Large font option | |
Battery type | 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 |
Charging method | Garmin proprietary plug charger |
Memory/History | 4 GB |
Clock Features |
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Time/date | |
GPS Time Sync | |
Automatic daylight saving time | |
Alarm clock | |
Timer | |
Stopwatch | |
Sunrise/sunset times |
Health & Wellness Monitoring |
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Wrist-based heart rate (constant, every second) | |
Resting heart rate | |
Abnormal heart rate alerts | yes (high and low) |
Respiration rate | |
Fitness age | |
Body Battery™ energy monitor | |
All-day stress | |
Relaxation reminders | |
Relaxation breathing timer | |
Sleep | yes (advanced) |
Sleep coach | |
Breathing variations | |
Nap detection | |
Hydration | yes (in Garmin Connect™ and optional Connect IQ™ widget) |
Women's health | yes (in Garmin Connect™ and optional Connect IQ™ widget) |
Health snapshot | |
Jet lag adviser |
Sensors |
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GPS | |
GLONASS | |
Galileo | |
QZSS | |
BeiDou | |
SatIQ™ Technology | |
Garmin Elevate™ wrist heart rate monitor | |
Pulse Ox Blood Oxygen Saturation Monitor | |
Barometric altimeter | |
Compass | |
Gyroscope | |
Accelerometer | |
Thermometer |
Daily Smart Features |
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Connectivity | Bluetooth®, ANT+® |
Connect IQ™ (downloadable watch faces, data fields, widgets and apps) | |
On-device Connect IQ™ Store | |
Smart Notifications | |
Text response/reject phone call with text (Android™ only) | |
View images from notifications on watch (Android™ only) | |
Morning report | |
Calendar | |
Weather forecasts | |
Realtime settings sync with Garmin Connect™ mobile | |
Battery saver (customizable low power watch) | |
Controls smartphone music | |
Find My Phone | |
Find My Watch | |
Find My Phone during GPS activity | |
Compatible with Garmin Messenger app | |
VIRB® Remote | |
Smart trainer control | |
Pairs with Garmin Connect™ Mobile | |
Smartphone compatibility | iPhone® and Android™ |
Stocks | yes (optional Connect IQ app) |
Garmin Share | |
Passcode |
Workout and Training Plans |
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Daily Suggested Workout - Running | |
Daily Suggested Workout - Cycling | |
Garmin Running Coach | |
Garmin Running Coach Experts | |
Garmin Cycling Coach | |
Garmin Coach - Prebuilt Cycling Plans | |
Garmin Coach - Strength | |
Strength workouts | |
HIIT workouts | |
Yoga workouts | |
Pilates workouts | |
On-screen workout animations | |
On-screen workout muscle maps |
Activity Profiles |
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Gym | Strength, HIIT, Cardio, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Jump Roping |
Multisport | Triathlon |
Wellness | Walking, Pilates, Yoga, Indoor Walking |
Indoor running | Treadmill Running, Indoor Track Running, Virtual Running |
Outdoor running | Running, Outdoor Track Running, Trail Running, Ultra Running |
Outdoor recreation | Hiking, Bouldering, Archery |
Cycling | Biking, Mountain Biking, eBiking, eMountain Biking, Indoor Biking |
Swim | Pool Swimming, Open Water Swimming |
On the Water | Stand Up Paddleboarding, Rowing |
Racket sports | Tennis, Pickleball, Badminton, Squash, Table Tennis, Padel, Platform Tennis, Racquetball |
Snow & winter | Skiing, Snowboarding, XC Classic Skiing |
Team sports | Basketball, Volleyball, Field Hockey, Ice Hockey, Football/Soccer, American Football, Lacrosse, Rugby, Ultimate Disc, Cricket, Softball, Baseball |
In the ring | Boxing, Mixed Martial Arts |
Other activity profiles | Inline skating |
Safety and Tracking Features |
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Incident Detection during select activities | |
Incident detection alert on phone for wearables | |
Assistance | |
LiveTrack | |
Live Event Sharing | Android™ Only |
Activity Tracking Features |
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Step counter | |
Auto goal (learns your activity level and assigns a daily step goal) | |
Calories burned | |
Floors climbed | |
Distance traveled | |
Intensity minutes | |
TrueUp™ | |
Move IQ™ | |
Garmin Connect™ Challenges app | yes (optional Connect IQ app) |
Automatic rep counting |
Training, Planning and Analysis Features |
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Customizable data pages | |
Downloadable training plans | |
Course guidance | |
HR zones | |
HR alerts | |
HR calories | |
% HR max | |
% HRR | |
Recovery time | |
Auto max HR | |
Race glance/widget | |
HRV status | |
HR broadcast (broadcasts HR data over ANT+® to paired devices) | |
Respiration rate (during exercise) | |
Distance traveled | yes (with compatible accessory) |
GPS speed and distance | |
Customizable activity profiles | |
Auto Pause® automatic timer halt | |
Interval training | |
Improved interval (includes open repeats, intervals data page, rest screen and auto detection) | |
Advanced workouts | |
HRM running pace and distance | |
Auto Lap® interval tracking feature | |
Manual lap | |
Rest timer | |
Configurable lap alerts | |
VO2 Max (Run) | |
VO2 Max (Trail Run) | |
Load ratio | |
Training load | |
Training load focus | |
Training effect | |
Training effect (anaerobic) | |
Primary benefit (Training Effect labels) | |
Improved recovery time | |
Custom alerts | |
Voice alerts | |
Multisport auto transition | |
Finish time | |
Virtual Partner | |
Race an Activity | |
Auto multisport activities | |
Manual multisport activities | |
Touch and/or button lock | |
Auto scroll | |
Activity history on watch | |
Physio TrueUp | |
Unified training status |
Running Features |
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GPS-based distance, time and pace | |
Running dynamics | |
Vertical oscillation and ratio | |
Ground contact time and balance | |
Stride length (real time) | |
Cadence (provides real-time number of steps per minute) | |
Running power | |
Grade-adjusted pace | |
Performance condition | |
Lactate threshold | |
PacePro™ Pacing Strategies | |
Run workouts | |
Trail run auto climb | |
Race predictor | |
Course- and weather-specific race predictor | |
Foot pod capable | |
Run/Walk/Stand detection |
Outdoor Recreation |
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Point-to-point navigation | |
Bread crumb trail in real time | |
Back to start | |
TracBack® | |
UltraTrac mode | |
Up Ahead | |
Elevation profile | |
Distance to destination | |
Barometric trend indicator with Storm Alert | |
Vertical speed | |
Total ascent/descent | |
Auto rest | |
Future elevation plot | |
Projected waypoint | |
Sun and moon information |
Cycling Features |
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Courses | |
Bike lap and lap maximum power (with power sensor) | |
Race an activity | |
Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories) | |
Compatible with Vector™ and Rally™ (power meters) | |
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) | |
Power meter compatible |
Swimming Features |
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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) | yes (with HRM-Swim, HRM-Pro or HRM-Pro Plus) |
Kid Activity Tracking Features |
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Toe-to-Toe™ Challenges app | yes (optional Connect IQ Toe-to-Toe™ Challenges app) |