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Forerunner 255S
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Forerunner 255S

Part Number 010-02641-02

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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.

Get an overview of your sleep, HRV status and daily workout with morning report.

Charge less, train more with up to 12 days of battery life in smartwatch mode and up to 26 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.

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.

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.

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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.

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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.

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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 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’s 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.

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.

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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.

 

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.

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 features3 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 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.

2 This is not a medical device and is not intended for use in the diagnosis or monitoring of any medical condition; see Garmin.com/ataccuracy. Pulse Ox is not available in all countries.
3 When paired with your compatible smartphone. For safety and tracking feature requirements and limitations, see Garmin.com/safety.
FirstBeat Analytics
Apple is a trademark of Apple Inc., registered in the U.S. and other countries. Android is a trademark of Google LLC.

General

Lens Material Corning Gorilla Glass 3
Bezel Material fiber-reinforced polymer
Quick Release bands (18 mm, Industry standard)
Strap material silicone
Physical size 41 x 41 x 12.4 (mm)
Fits wrists with a circumference of 110-175 mm
Color display  
Display Size 1.1" (27.5mm) Diameter
Display resolution 218 x 218 pixels
Display Type sunlight-visible, transflective memory-in-pixel (MIP)
Weight 39 g
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
Memory/History 4 GB

Clock Features

Time/date  
GPS Time Sync  
Automatic daylight saving time  
Alarm clock  
Timer  
Stopwatch  
Sunrise/sunset times  

Health Monitoring

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 in sleep)
Fitness Age  
Body Battery Energy Monitor  
All-day Stress  
Relaxation breathing timer  
Sleep (advanced)
Sleep score and insights  
Hydration (in Garmin Connect and optional Connect IQ widget)
Women's Health (in Garmin Connect and optional Connect IQ widget)
Health snapshot  

Sensors

GPS  
GLONASS  
Galileo  
Multi-frequency Positioning  
Garmin Elevate wrist heart rate monitor  
Barometric altimeter  
Compass  
Gyroscope  
Accelerometer  
Thermometer  
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  
Smart Notifications  
Text response/reject phone call with text (Android only)  
Calendar  
Weather  
Realtime settings sync with Garmin Connect mobile  
Battery saver (customizable low power watch)  
Controls smartphone music  
Find My Phone  
Find My Watch  
VIRB Remote  
Smartphone compatibility iPhone and Android
Pairs with Garmin Connect Mobile  

Safety and Tracking Features

LiveTrack  
Live Event Sharing Android Only
Incident Detection during select activities  
Assistance  

Activity Tracking Features

Step counter  
Move 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 burned  
Floors climbed  
Distance traveled  
Intensity minutes  
TrueUp  
Move IQ  
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
Strength workouts  
HIIT workouts  
Yoga workouts  
Pilates workouts  
On-screen workout animations  
On-screen workout muscle maps  

Training, Planning and Analysis Features

HR zones  
HR alerts  
HR calories  
% HR max  
% HRR  
Recovery time  
Auto max HR  
Morning report  
Race glance/widget  
HRV status  
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  
Auto Pause  
Interval training  
Improved interval (includes open repeats, intervals data page, rest screen and auto detection)  
Advanced workouts  
Downloadable training plans  
Auto Lap  
Manual lap  
Rest timer  
Configurable lap alerts  
VO2 Max (Run)  
VO2 Max (Trail Run)  
Training Status improved
Training Load  
Training load focus  
Training Effect  
Training Effect (anaerobic)  
Primary benefit (Training Effect labels)  
Improved recovery time  
Daily suggested workouts (7 days)
Custom alerts  
Audio prompts  
Finish time  
Virtual Partner  
Race an Activity  
Auto multisport activities  
Manual multisport activities  
Course guidance  
Touch and/or button lock  
Auto scroll  
Activity history on watch  
Physio TrueUp  

Running Features

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 real-time number of steps per minute)  
Running power (with compatible accessory)
Performance condition  
Lactate threshold (with compatible accessory)
PacePro Pacing Strategies  
Run workouts  
Race predictor  
Course- and weather-specific race predictor  
Foot pod capable  

Outdoor Recreation

Available outdoor recreation profiles Hiking, Skiing, Snowboarding, XC Classic Skiing, Stand Up Paddleboarding, Rowing
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  
Trail run auto climb  
Vertical speed  
Total ascent/descent  
Future elevation plot  
Projected waypoint  
Sun and moon information  

Cycling Features

Available cycling profiles Biking, Indoor Biking, Mountain Biking, eBiking, eMountain Biking
Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories)  
Courses  
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)  

Swimming Features

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)

Connectivity

Smart trainer control  
  • Forerunner 255S
  • Charge/data cable
  • Documentation

 


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