Garmin Smart Watch | Forerunner 255, GPS Running & Training

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.

Tune Your Training
Add a beat to your step. Get the training and recovery insights you need to run at a higher level — plus music to motivate you along the way.

• Get an overview of your sleep, HRV status, and daily workout with a 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.

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 Music — 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-Promonitor, 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.

Pace Pro 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 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 Music watch measures crucial running metrics such as cadence, stride length, ground contact time and balance, and more — while compared 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 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.

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.

Music on Your Wrist
Download up to 500 songs plus playlists from your Spotify, Deezer, or Amazon Music accounts (subscription required).

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.

Live Track 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.

Tech Specs

In the Box

• Forerunner 255
• Charge/data cable
• Documentation.