2025 Garmin Forerunner® 255

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.

In the Box

• Forerunner 255
• Charge/data cable
• Documentation

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 Payments ¹ .

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.

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 variabilitywhile 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 plansfor 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 metricssuch as cadence, stride length, ground contact time and more.

WRIST-BASED RUNNING POWER

See how much poweryou’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 recoverbefore 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 effectfeedback.

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.

WRIST-BASED HEART RATE

The watch constantly samples your heart rate ²with 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 ².

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 ².

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 sensor ³monitors 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 cycleor 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 rate ², heart rate variability, Pulse Ox ³, respiration and stress. Then generate a report with those stats to share via the Garmin Connect appon your compatible smartphone.

SATIQ™ TECHNOLOGY

Multi-band GNSS with SatIQ technology ensures the best positioning accuracy in any environment while also optimizing the device’s battery life.

GARMIN PAY CONTACTLESS PAYMENTS

Breeze through checkout lines with Garmin Pay contactless payments ¹through 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 features ⁴send 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 location ⁴and even view your entire preplanned course. Rest assured that your loved ones know exactly where you’re running.

GARMIN TRAILS

Access thousands of trails, and send them directly to your compatible device for offline use with a subscription to Garmin Connect+ in the Garmin Connect™ app or to Outdoor Maps+ in the Garmin Explore™ app. Available in select areas. Learn more.

GARMIN CONNECT APP

See your health and fitness information, connect and compete with friends, sign up for challenges to earn badges and more.

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.

Click for Important Safety and Product Information

¹View current supported country, payment network and issuing bank information

²Activity tracking accuracy

³This 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 not available in all countries.

⁴When paired with your compatible smartphone. For safety and tracking feature requirements and limitations, see Garmin.com/safety.

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Engineering enhancements are ongoing and may not be reflected in the pictures, videos and specifications.