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Garmin

Garmin Forerunner® 255, GPS Running Smartwatch, 46mm, Slate Gray

  • Based on 1,595 reviews
Condition: Used - Like New
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Availability: Only 6 left in stock, order soon!
Fulfilled by Amazon
Arrives Oct 8 – Oct 16
Order within 18 hours and 58 minutes
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Color: Slate Gray


Size: 46 MM


Style: Non-Music


Pattern Name: Smartwatch


Features

  • Built with a slim design and an always-on, full-color display thats light on the wrist and easy to read even in direct sunlight with available sizes of 46 mm and 41 mm
  • Forerunner 255 provides up to 14 days of battery life in smartwatch mode and up to 30 hours in GPS mode for a full picture of your health from sleep to training
  • Morning report summarizes your sleep, HRV status and daily workout suggestion in one place as soon as you wake up (This device is intended to give an estimate of your activity and metrics)
  • Get ready for your next race with training tips, personalized daily suggested workouts and completion time predictions based on course details, weather and performance
  • View your entire week of daily suggested workouts, which adapt after every run to match your performance and recovery
  • HRV status tracks your heart rate variability while you sleep, giving you greater insight into your overall wellness, recovery and training performance (This device is intended to give an estimate of your activity and metrics)
  • Get free adaptive training plans from Garmin Coach for a 5K, 10K and half-marathon, or create your own custom workouts in the Garmin Connect smartphone app
  • Evaluates your current training status to indicate if youre undertraining or overdoing it; offers additional performance monitoring features, including recovery time after your workouts
  • When using a Running Dynamics Pod or HRM-Pro monitor (sold separately), get a continuous measurement on your wrist of how much power youre applying to the road as you run, so you can manage your effort
  • When using a Running Dynamics Pod or HRM-Pro monitor (sold separately), get advanced running dynamics, including ground contact time balance, stride length, vertical ratio and more

Description

Run at a higher level with the Forerunner® 255 smartwatch. These running smartwatches help you train and recover smarter with training status, running power, multi-band GPS and daily suggested workouts that adapt to your performance and goals. Plus, other new features — such as race widget — help you plan your race-day strategy, and morning report with HRV status reveals your overall health alongside the day ahead. And with Garmin Pay™ contactless payments with a supported card, it’s never been easier to buy that post- workout coffee — no matter how you work out — with more than 30 activity profiles, including triathlon, cycling, swimming and more. With Forerunner 255, you can get a continuous picture of your health, from training and recovery to sleep quality and overall wellness — and with up to 14 days of battery life in smartwatch mode and up to 30 hours in GPS mode.

Operating System: Garmin OS


Memory Storage Capacity: 4 GB


Special Feature: Built-in Sports Apps, Daily Suggested Workouts, HRV Status, Morning Report, Race Adaptive Training Plans See more


Battery Capacity: 223 milliamp_hours


Connectivity Technology: Bluetooth, USB


Wireless Communication Standard: Bluetooth


Battery Cell Composition: Lithium Ion


GPS: GPS Enabled


Shape: Heart


Screen Size: 1.3 inches


Operating System: Garmin OS


Additional Features: Built-in Sports Apps, Daily Suggested Workouts, HRV Status, Morning Report, Race Adaptive Training Plans


GPS Geotagging Functionality: GPS Enabled


Band Material Type: Silicone


Case Material Type: Resin


Water Resistance Level: Water Resistant


Sport Type: Exercise & Fitness, Outdoor Lifestyle, Running, Track & Field, Training


Human Interface Input: Buttons


Supported Application: GPS


Supported Satellite Navigation System: GPS


Controller Type: Touchscreen, other


Metrics Measured: Heart Rate,Step Count,Calorie Tracker,Sleep Monitor,Blood Oxygen SpO2


Shape: Heart


Style Name: Non-Music


Color: Slate Gray


Band Color: Slate Gray


Battery Capacity: 223 milliamp_hours


Battery Cell Type: Lithium Ion


Battery Average Life: 14 days


Screen Size: 1.3 inches


Display Type: Sunlight-Visible, Transflective Memory-in-Pixel (MIP)


Resolution: 260 x 260


Band Width: 22 millimeters


Item Weight: 1.7 ounces


Item Dimensions: 1.8 x 1.8 x 0.5 inches


Band Length: 22 centimeters


Item Dimensions D x W x H: 0.5"D x 1.8"W x 0.5"H


Brand: Garmin


Model Name: Forerunner 255


Target Audience: Unisex Adults


Age Range Description: Adult


Model Number: 010-02641-00


Built-In Media: Forerunner 255/255s; Charging/data Cable; documentation


Warranty Description: 1 year limited warranty


Wearable Computer Type: Smart Watch


Unit Count: 1 Count


UPC: 753759279837


Global Trade Identification Number: 37


Manufacturer: Garmin


Item Type Name: Running Smartwatch


Connectivity Technology: Bluetooth, USB


Wireless Compability: Bluetooth


Wireless Provider: du


Communication Feature: Email, Notification, Text Message


Sim Card Size: eSIM


Compatible Devices: Smartphone


Memory Storage Capacity: 4 GB


Warranty Type: Limited


Waterproof Rating: IP67


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Oct 8 – Oct 16

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Excellent Upgrade from the Forerunner 745
Color: Slate Gray Size: 46 MM Style: Non-Music Pattern Name: Smartwatch
I’ve been a Garmin user for over 10 years, and I upgraded from the Forerunner 745 to the Forerunner 255. This is an excellent upgrade and immediately feels like a more refined and capable watch. The 255 is lighter and more comfortable to wear all day, and the battery life is noticeably better than the 745. I’m also seeing improved GPS accuracy and more consistent tracking overall. The updated metrics, including HRV status and the newer training insights, provide more useful data to support training and recovery. Performance is smooth, reliable, and exactly what I expect from Garmin. It keeps everything I liked about the 745 while improving the areas that matter most, especially battery life, comfort, and tracking accuracy. If you’re coming from the 745, the Forerunner 255 is absolutely a worthwhile upgrade. Highly recommended. ... show more
Reviewed in the United States on February 16, 2026 by Cesar Rengifo
    • This thing is next level!
Color: Slate Gray Size: 46 MM Style: Non-Music Pattern Name: Smartwatch
Review Image by Marcos
Review Image by Marcos
Review Image by Marcos
I really am enjoying this watch. I'll start off by saying it I used to have an Apple watch but no longer have an iPhone so I was looking for an alternative. I've used Fitbit and apple watches and feel they are accurate at tracking things like heart rate and GPS. This watch feels the most accurate out of both of those. The Garmin app isn't as pretty and easy to use as Fitbit but the quality and information is so much better. Also the customization of this watch is insane. From multiple backgrounds to the way you can set up what information you want to see during any given workout is awesome. As you can tell by my watch face there is a great amount of information just by looking at the first screen and more if you scroll around. This is the 46mm case size and I really think it's the perfect balance between being able to see the information and not being too bulky. Obviously the tranflective display is not as pleasing as an AMOLED display like and apple watch, galaxy watch, pixel watch, or Garmins own venu or epix watches but it honestly is not that bad. Also I've heard of bad backlight reviews on the Garmin watches where the screen looks washed out and blue when the backlight is on and I think I got a good one. It's almost been two weeks and I'm still at 67% battery life. I have yet to swim with the watch but it feels like good quality and the gps has been accurate on my runs. I was thinking of getting a Fenix 6 since they are much cheaper now but the features and less bulkiness of this Garmin Forerunner 255 sold me. The gray color is okay but I might end up going with a different band style and color in the future. The video taken with the backlight on is with the brightness at 20%. Take your fitness goals to the next level and get this watch! ... show more
Reviewed in the United States on December 16, 2022 by Marcos
    • Very satisfied with purchase and battery life.
Color: Tidal Blue Size: 46 MM Style: Non-Music Pattern Name: Smartwatch
I previously had a Garmin 235 that I had bought used, and it died. I finally bought myself a new Garmin. This thing is great, very basic, but solid and very accurate with the GPS. Battery life is awesome at 14+ days when not using GPS. It dips faster when you use it for running/volleyball, etc, but still gets like over a week when I'm working out 6-7 days before needing a charge. Holds battery way better than Apple watches, etc. Text, and messenger notifications come through great on the watch as well. ... show more
Reviewed in the United States on June 9, 2026 by James
    • Uninterrupted Performance, Highly Reliable & Very Comfortable!
The Garmin Forerunner® 255S has truly become my absolute favorite smartwatch and has been a key tool through my fitness journey, here's why I love it: Adapting to My Workouts: Although labeled as a running smartwatch, it effortlessly fits into my diverse workout routine. Whether I'm hitting the gym, practicing yoga, or going for a nature walk, it tracks my progress with accuracy. Feels Like Nothing: The lightweight design is a game-changer. During workouts and even during sleep, I barely notice it's there, allowing me to focus solely on my routines. Accurate Insight: From heart rate monitoring to sleep tracking, it offers insights that help me tailor my workouts effectively and monitor my health data reliably and easily. Knowing I can rely on its data keeps me motivated. Part of My Day: Its sleek profile and customizable faces make it not just a workout companion, but an everyday accessory that reflects my style. No Worries About Charging: One thing I appreciate is its impressive battery life. It's a relief knowing I can wear it all day without needing to recharge constantly. For my use, it lasts 11 days before needing a charge. When It does need charging, it charges FAST! In short, the Garmin Forerunner® 255S is more than a gadget; it's a personal fitness partner. It adapts to my routine, offers accurate insights, and feels like a natural extension of my active lifestyle. Whether I'm lifting weights or running errands, it's a constant companion that helps me stay on track and motivated. I highly recommend this watch! ... show more
Reviewed in the United States on August 12, 2023 by AMTZ22
    • Get this watch
Color: Slate Gray Size: 46 MM Style: Non-Music Pattern Name: Smartwatch
I’ve been using the Garmin Forerunner 255 for a few months now, and I’m genuinely impressed. It strikes a great balance between advanced performance features and everyday usability. The GPS accuracy is top-notch, thanks to the dual-frequency support, and I’ve had no issues with tracking even in areas with spotty reception like wooded trails or city streets. Battery life is a huge plus—it easily lasts close to two weeks in smartwatch mode and over a day with continuous GPS. The design is lightweight and comfortable for all-day wear, including during sleep tracking, and the five-button interface is simple and responsive (though I do sometimes miss having a touchscreen). Training features are where this watch really shines. It supports multiple sports modes, heart rate variability, stress tracking, and Garmin’s “Body Battery” to gauge overall energy levels. The race predictor, morning report, and recovery time estimates are surprisingly useful. Sleep tracking is detailed and generally accurate, and syncing with the Garmin Connect app is smooth. My only minor complaint is that you need the Music version if you want onboard music storage; otherwise, you're just controlling your phone’s playback. Also, no touchscreen might be a con for some, but the physical buttons work great in sweaty or wet conditions. ... show more
Reviewed in the United States on April 28, 2025 by Mariana
    • Absolutely love this watch as an activity and wellness tool
Review Image by Kelly MTD
I am not a runner but I have been considering a Garmin watch for a long time because I am usually an active hiker. I haven't been as active for a while and I feel like the wellness tracking this device offers is helping me back on track. This has been one of those purchases that I wish I had pulled the trigger on sooner now that I have it. Combined with the web app I really love the amount of detail that I can get and the variety of things I can easily track. I've found the GPS tracking on my longer walks to be very accurate so far. I also enjoy the variety of customization options both native to the watch and through Connect IQ score. I know that the sleep, stress, body battery, etc, are not the most accurate, but they are still a great tool for getting a rough idea of where I can improve. For me, being called out by something as neutral as data is very helpful and I appreciate being able to see trends and make note of things that I could change for the better. I do have to take some of the body measurements with a grain of salt because of medications that I take, like the HRV-based stress readings (always high for me), so you should take that into consideration if you are prescribed any kind of medication that either stimulates or sedates. I am so glad I went with the smaller model, I am a petite person and it feels like the perfect size for my wrist. I don't find it to be obtrusive at all. I don't love the silicone band and went with an alternative that looks better at the office and doesn't bother my skin as much. ... show more
Reviewed in the United States on September 4, 2023 by Kelly MTD
    • Great running metrics.
Color: Slate Gray Size: 46 MM Style: Non-Music Pattern Name: Smartwatch
Great watch for runners. Sleep tracking not as accurate as other watches. Running metrics such as pace, stride length, hr, power are helpful info for improvement.
Reviewed in the United States on July 10, 2026 by M. Quinn
    • Ironman Watch!
Color: Slate Gray Size: 46 MM Style: Non-Music Pattern Name: Smartwatch
I just completed my first Ironman 140.6 with the Garmin Forerunner 255. This watch is SOLID! Long workouts. Ironman 70.3 races. Ironman 140.6 races. This watch never hiccups or runs out of battery. It does the job.
Reviewed in the United States on June 24, 2026 by S. Cross

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