Garmin Forerunner 255 Smart Watch

The Garmin Forerunner 255 is a performance-focused GPS running smartwatch designed for runners, cyclists and multisport athletes who want detailed training data without a bulky design. Its sunlight-visible 1.3-inch color display remains easy to read during outdoor workouts, while built-in multi-band GNSS helps provide accurate positioning in challenging environments. The watch offers daily suggested workouts, Garmin Coach training plans, training status, training effect, VO2 Max, HRV status, recovery time, race predictor and PacePro. It also supports more than 30 sports profiles, including running, cycling, swimming and HIIT. Health and wellness features include wrist-based heart rate, Pulse Ox, sleep tracking, stress monitoring and Body Battery. With up to 14 days of smartwatch battery life and up to 30 hours in GPS-only mode, the Forerunner 255 is built for consistent training and everyday fitness tracking. It is available in Tidal Blue and Slate Gray.

Key Features

• Display: 1.3-inch sunlight-visible transflective MIP color display

• GPS: Multi-band GNSS for improved positioning accuracy in challenging environments

• Training: Daily suggested workouts, training status, training effect and recovery insights

• Garmin Coach: Adaptive training plans for running goals

• Performance Metrics: VO2 Max, training load, training effect, race predictor and PacePro

• HRV Status: Tracks heart rate variability during sleep to provide recovery and fitness insights

• Health Tracking: Wrist-based heart rate, Pulse Ox, sleep, stress and Body Battery monitoring

• Sports Profiles: More than 30 built-in sports and activity modes

• Smart Features: Garmin Pay, smart notifications, LiveTrack and incident detection

• Battery Life: Up to 14 days in smartwatch mode and up to 30 hours in GPS-only GNSS mode

• Water Resistance: 5 ATM water rating

• Color Options: Tidal Blue and Slate Gray

Product Specifications

• Brand: Garmin

• Model: Forerunner 255

• Product Type: GPS Running Smartwatch

• Display Type: Sunlight-visible, transflective memory-in-pixel (MIP)

• Display Size: 1.3 inches / 33 mm diameter

• Display Resolution: 260 x 260 pixels

• Touchscreen: No

• Lens Material: Corning Gorilla Glass 3

• Bezel Material: Fiber-reinforced polymer

• Strap Material: Silicone

• Case Size: 45.6 x 45.6 x 12.9 mm

• Wrist Circumference: 130–205 mm

• Weight: 49 g

• Band Size: 22 mm industry-standard quick-release

• Battery Type: Rechargeable built-in lithium-ion

• Smartwatch Battery Life: Up to 14 days

• GPS-Only GNSS Battery Life: Up to 30 hours

• All-Systems GNSS Battery Life: Up to 25 hours

• All-Systems GNSS With Multi-Band: Up to 16 hours

• Water Rating: 5 ATM

• Memory: 4 GB

• Charging Method: Garmin proprietary plug charger

• Available Colors: Tidal Blue and Slate Gray

Training & Performance

• Daily Suggested Workouts: Workout Guidance: Receive running or cycling workout suggestions based on training load and status

• Training Status: Performance Tracking: Understand whether your current training is productive and how your fitness is progressing

• Training Effect: Workout Analysis: See how individual workouts affect your aerobic and anaerobic fitness

• VO2 Max: Fitness Measurement: Monitor estimated aerobic fitness and changes over time

• Race Predictor: Race Planning: Estimate potential race times based on your fitness and training data

• PacePro: Pacing Strategy: Follow grade-adjusted pacing guidance for planned courses

• Recovery Time: Recovery Guidance: Get an estimate of the recovery time recommended after demanding workouts

• Running Dynamics: Advanced Metrics: Compatible accessories can provide additional running dynamics such as cadence, stride length and ground contact time

Easy Operation / Usage

• Controls: Use the physical buttons to navigate menus, activities and workout screens

• Running: Select a running profile and start the activity to record GPS-based performance data

• Training Plans: Follow daily workout suggestions or use Garmin Coach for structured training

• Activity Tracking: Choose from more than 30 built-in sports and activity profiles

• Smartphone Connection: Pair with a compatible smartphone to receive notifications and synchronize data with Garmin Connect

• Data Review: Review training, health and activity information on the watch or through Garmin Connect

• Sensor Support: Compatibility: Connect compatible heart rate monitors, running sensors, cycling accessories and other supported ANT+ or Bluetooth sensors

Why Choose This Product

• Running Focused: Purpose: Designed for runners who want detailed training and performance information

• Accurate Positioning: Multi-Band GNSS: Provides enhanced positioning accuracy in difficult environments such as dense urban areas

• Long Battery: Battery Life: Up to 14 days of smartwatch use and up to 30 hours of GPS-only tracking

• Outdoor Readability: MIP Display: The sunlight-visible display is designed for clear viewing during outdoor activities

• Multisport Support: Sports Profiles: Supports running, cycling, swimming, HIIT and many other activities

• Training Insights: Performance Data: Provides VO2 Max, training status, training effect, race prediction and recovery information

• Everyday Features: Garmin Pay: Supports compatible contactless payments along with notifications and safety features

In the Box

• Garmin Forerunner 255 smartwatch

• Silicone watch band

• Garmin charging cable

• Documentation