Garmin Forerunner 255, GPS Running Smartwatch, Advanced Insights, Long-Lasting Battery, Slate Gray

Long-Lasting Battery
Train longer with up to 14 days of battery life in smartwatch mode and up to 30 hours in GPS mode, giving you a complete view of your sleep, stress, and training load without frequent charging.

Morning Report
Wake up to a helpful summary including your sleep insights, HRV status, and personalized daily workout suggestions—all in one place. (Metrics are intended as estimates.)

Race-Ready Training Tools
Prepare confidently for your next event with training tips, personalized daily workouts, and predicted completion times based on course details, weather, and current performance.

Adaptive Daily Workouts
View your entire week of recommended workouts. Each session automatically adjusts based on your performance, recovery, and changes in your training readiness.

HRV Status Tracking
HRV Status measures your heart rate variability while you sleep, helping you better understand your recovery, stress levels, and overall wellness. (Metrics are intended as estimates.)

Garmin Coach Training Plans
Access free adaptive training plans for 5K, 10K, and half‑marathon distances from Garmin Coach—or create custom workouts directly in the Garmin Connect app.

Training Status and Recovery Insights
Know whether you’re training efficiently. Forerunner 255 evaluates your current training load and indicates whether you’re undertraining or overreaching, while also providing detailed recovery time after workouts.

Advanced Running Dynamics and Power (With Compatible Accessories)
Pair with a Running Dynamics Pod or HRM‑Pro™ monitor (sold separately) to access continuous running power data and advanced metrics like ground contact time balance, stride length, vertical ratio, and more—directly from your wrist.