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Garmin Forerunner 255 Running Smartwatch

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Garmin Forerunner 255 Running Smartwatch

The Garmin Forerunner 255 is a multisport triathlon watch that can now swim, bike, and run, thanks to Garmin's high-end multi-band/dual-frequency GPS chipset.

The Forerunner 255 is as light as a feather, with a streamlined design and a weight of only 1.7 g oz. The Garmin Forerunner 255 will be offered in two sizes, the Forerunner 255 and the Forerunner 255S Music for women and people with slim wrists, and will be available in a variety of colors, including tidal blue and light pink. It has a battery life of 14 days in smartwatch mode and up to 30 hours in GPS mode. The Forerunner 255 music edition has a storage capacity of 500 songs and can connect to Deezer, Spotify, and Amazon Music.

Garmin Forerunner 255S

Garmin Forerunner 255

Case diameter

41 mm; 1.61"

45.6 mm; 1.78"

Case height

12.4 mm; 0.49"

12.9 mm; 0.51"

Strap width

22 mm; 0.89"

22 mm; 0.89"

Display size




218 x 218 px

260 x 260 px


39 g

49 g


With over 30+ in-built sports and activity profiles, from running to swimming, the Forerunner 255 is a great gift to yourself for monitoring your health and fitness level. With a single click of a button, you can switch from one activity to the next.

Every day, get an overview of your workout and sleep statistics, plan your approach efficiently with suggested workouts, prepare for the race with training suggestions, and use the Garmin coach for free training plans.

Continuous measurement of your running power using aRunning Dynamics Pod orHRM-Pro™ monitor, your recovery time before your next workout, training status and measurement records, feedback of your training, and performance condition of your heart, are all available on your wrists.

The Forerunner 255 watch measures important running metrics including cadence, stride length, ground contact time and balance, and more, and compares them to others in the Garmin Connect app when using a Running Dynamics Pod or HRM-Pro monitor. You'll never run out of places to run if you use the Garmin Connect app to create or find existing courses. Alternatively, you may plan one on other sites like Strava and Komoot and have it automatically synced to your Forerunner.

Monitor your wellness with Forerunner 255, which constantly records your heart rate, body energy, sleep quality, blood oxygen saturation levels, menstrual cycle, and stress tracking. Then, using the Health SnapshotTM feature in your Garmin Connect app on your compatible smartphone, create a report with those stats to share.

Stay connected at every step with the multi-band GNSS support, receive texts, and notifications directly on your wrist, and can even respond to texts if you have an Android phone. Safety and tracking features notify emergency contacts of your whereabouts. Friends and relatives may track your real-time whereabouts and even see your whole pre-planned route with the Livetrack feature. To get even more benefits, connect with the Garmin Connect app and the Connect IQ store, and use the GarminPay

The Garmin Forerunner 255 is a full-fledged multisport watch with a boatload of functions that fits on your wrist!

  • Two case diameters- 45.6 mm and 41 mm
  • Music edition can store more than 500 songs and can connect to Deezer, Spotify, and Amazon Music
  • Silicone band and Corning Gorilla Glass 3 for durability
  • Lightweight- 1.7 oz weight
  • Battery life of up to 14 days in smartwatch mode and up to 30 hours in GPS mode
  • New heart rate sensor and multi-frequency GPS receiver
  • Morning reports of sleep summary, training status, HRV
  • Recommended training programs
  • Barometer and gyroscope
  • 30+ Activity profiles- Running to swimming
  • Race widget and Garmin coach
  • Running power and recovery time measurement
  • PaceproTM feature helps plan race strategy
  • Training status and workout intensity indicator
  • Performance condition and courses on Garmin Connect
  • Running Dynamics Pod orHRM-Pro monitor measures crucialrunning metrics 
  • Visual race predictor and cross-training preloaded programs
  • Monitor all health parameters including sleep quality and stress
  • Stay connected with Multi-band GNSS support and smart notifications of texts and e-mails
  • Safety and tracking features, Livetrack feature, and Garmin Connect app
  • GarminPay for contactless payment



Lens material:Corning® Gorilla® Glass 3

Bezel material: Fiber-reinforced Polymer

Quick Release Bands: yes (22 mm, Industry standard)

Strap Material:Silicone

Physical size:45.6 x 45.6 x 12.9 (mm); fits wrists with a circumference of 130-205 mm

Color Display: Yes

Display Size:1.3" (33 mm) diameter

Display Resolution:260 x 260 pixels

Display Type:Sunlight-visible, Transflective Memory-in-Pixel (MIP)

Weight:49 g

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

Water Rating: 5 ATM

Memory/History:4 GB

Clock Features:

Time/Date: Yes

GPS Time Sync: Yes

Automatic Daylight Saving Time: Yes

Alarm clock: Yes

Timer: Yes

Stopwatch: Yes

Sunrise/ Sunset Times: Yes

Health Monitoring:

Wrist-based Heart Rate (constant, every second): Yes

Daily Resting Heart Rate: Yes

Abnormal Heart Rate Alerts: Yes (high and low)

Respiration Rate (24/7): Yes

Pulse Ox Blood Oxygen Saturation: Yes(spot-check, and optionally all-day and in sleep)

Fitness Age: Yes (in app)

All-day Stress: Yes

Body Battery™ Energy Monitor: Yes

Relaxation Reminders: Yes

Relaxation Breathing Timer: Yes

Sleep: Yes (advanced)

Hydration:Yes (in Garmin Connect™)

Women's health:Yes (in Garmin Connect™)

Health Snapshot: Yes


GPS: Yes



Multi-frequency Positioning: Yes

Garmin Elevate™ Wrist Heart Rate Monitor: Yes

Barometric Altimeter: Yes

Compass: Yes

Gyroscope: Yes

Accelerometer: Yes

Thermometer: Yes

Pulse ox Blood Oxygen Saturation Monitor: Yes

Daily Smart Features:

Connectivity: Bluetooth®, ANT+®

CONNECT IQ™ (Downloadable Watch Faces, Data Fields, Widgets and Apps): Yes

On-Device CONNECT IQ™ Store: Yes

Smart notifications: Yes

Text response/reject phone call with text (android™ only): Yes

Calendar: Yes

Weather: Yes

Realtime Settings Sync with Garmin CONNECT™ Mobile: Yes

Battery Saver (Customizable Low-Power Watch): Yes

Controls Smartphone Music: Yes

Find My Phone: Yes

Find My Watch: Yes


Smartphone Compatibility: iPhone®, Android™

Pairs with Garmin CONNECT™ Mobile: Yes

Garmin PAY™: Yes

Safety and Tracking Features:

Livetrack: Yes

Live Event Sharing: Android Only

Incident Detection during Select Activities: Yes

Assistance: Yes

Activity Tracking Features:

Step Counter: Yes

Move Bar (displays on device after a period of inactivity; walk for a couple of minutes to reset it): Yes

Auto Goal (learns your activity level and assigns a daily step goal): Yes

Calories Burned: Yes

Floors Climbed: Yes

Distance Traveled: Yes

Intensity Minutes: Yes


Move IQ™: Yes

Garmin CONNECTTM Challenges App: Yes

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: Yes

On-Screen Workout Muscle Maps: Yes

Automatic Rep counting: Yes

Training, Planning and Analysis Features:

HR Zones: Yes

HR Alerts: Yes

HR Calories: Yes

% HR MAX: Yes

% HRR: Yes

Recovery Time: Yes

Auto Max HR: Yes

Morning Report: Yes

Race Glance/ Widget: Yes

HRV Status: Yes

HR Broadcast(Broadcasts HR data over ANT+™ to paired devices): Yes

GPS Speed and Distance: Connected GPS only

Customizable Data Pages: Yes

Customizable Activity Profiles: Yes

Auto Pause®: Yes

Interval Training: Yes

Improved Interval (Includes Open Repeats, Intervals Data Page, Rest Screen and Auto Detection): Yes

Advanced Workouts: Yes

Downloadable Training Plans: Yes

Auto Lap®: Yes

Manual Lap: Yes

Rest Timer: Yes

Configurable Lap Alerts: Yes

VO2 Max (Run): Yes

VO2 Max (Trail Run): Yes

Training Status: Improved

Training Load: Yes

Training Load Focus: Yes

Training Effect: Yes

Training Effect (Anaerobic): Yes

Primary Benefit (Training Effect Labels): Yes

Improved Recovery Time: Yes

Daily Suggested Workouts: Yes (7 days)

Custom Alerts: Yes

Audio Prompts: Yes

Finish Time: Yes

Virtual Partner: Yes

Race an Activity: Yes

Auto Multisport Activities: Yes

Manual Multisport Activities: Yes

Course Guidance: Yes

Touch and/or Button Lock: Yes

Auto Scroll: Yes

Activity History on Watch: Yes

Physio TRUEUP: Yes

Available Running Profiles:Running, Outdoor Track Running, Treadmill Running, Indoor Track Running, Trail Running, Virtual Running, Ultra Running

Outdoor Recreation:Hiking, Skiing, Snowboarding, XC Classic Skiing, Stand Up Paddleboarding, Rowing

Cycling Features: Biking, Indoor Biking, Mountain Biking, eBiking, eMountain Biking

Swimming Features:Pool Swimming, Open Water Swimming

Toe-To-Toe™ challenges app: Yes (optional Connect IQ Toe-to-Toe™ Challenges app)

Connectivity: Smart Trainer Control


1 x Forerunner 255

1 x Charge/data cable

1 x Documentation