Garmin

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

433+ bought in the past month

$257.80$349.99

About this item

  • Built with a slim design and an always-on, full-color display that’s 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 you’re 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 you’re 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
$257.80
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Product details

Operating SystemGarmin OS
Memory Storage Capacity4 GB
Special FeatureBuilt-in Sports Apps, Daily Suggested Workouts, HRV Status, Morning Report, Race Adaptive Training Plans See more
Battery Capacity223 Milliamp Hours
Connectivity TechnologyBluetooth, USB
Wireless Communication StandardBluetooth
Battery Cell CompositionLithium Ion
GPSGPS Enabled
ShapeHeart
Screen Size1.3 Inches

Technical specifications

product_dimensions1.8 x 1.8 x 0.5 inches
item_weight1.7 Ounces
item_model_number010-02641-00
batteries1 Lithium Ion batteries required. (included)
best_sellers_rank#2,971 in Electronics ( See Top 100 in Electronics ) #94 in Smartwatches
date_first_availableJune 1, 2022
departmentmens
manufacturerGarmin
standing_screen_display_size1.3 Inches
memory_storage_capacity4 GB

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Customer reviews

4.73,850 ratings

Customers say

Customers find this smartwatch to be an excellent fitness tool that accurately tracks workouts, particularly for triathlons and high school runners, with outstanding battery life.

★★★★★

Great watch!

Brent JonesNovember 14, 2025

This is a great watch. I've had it for over two years now and just getting around to writing a review because I wanted to see if it stood the test of time. It does. Pros: it's not too big, all the features work flawlessly (music, gps, etc), and most importantly the battery life is spectacular and has not degraded in the years I have owned it. I wear this watch every day and I only charge it maybe once a month. The GPS is accurate, but I did not use it as much as I thought I might (I am a geology student and have to take coordinates regularly, real coordinates, not something on a navigation app). The thing is my iPhone is just as accurate (using specialized geology apps) and much easier to use. I don't use any of my real GSP units either. Guess that is the state of the art of GPS. Cons: I think the rubber band they ship it with leave much to be desired. I bought an aftermarket band with a velcro closure and problem is solved. And, It really does take a while to figure out how to use everything. It is not exactly intuitive and I still get lost in the menus. I'd buy it again. Read more

★★★★★

Well Worth the Money

TraceJuly 31, 2025

I LOVE this watch. I've been debating buying a running watch for so many years now and finally decided to do it. I have been doing marathon training and this watch has aided me plentifully. It has cool features when you record runs where it'll tell you every time you finish a "lap" which you can set the distance for - so during a long 10 mile run I have it set to tell me every time I finish 1 mile and what pace I finished it at. It also has cool badges you unlock when you run certain distances, and it will notify you every time you recorded a new personal best mile, 5k, 10k, half marathon, etc. during any long run. It displays a very accurate heartrate as well which I've tested multiple times and it's always within 5 of what I measure manually. You have to download Garmin Connect and Garmin Connect IQ on your phone which can then be used to download your favorite music app right to your watch (I use Spotify). From there, you can download your music/playlists/podcasts/audiobooks right to your watch. You can leave your phone at home then for long runs and just have your watch and your headphones with you; which is a lifesaver personally lol. The second you get back home from a run, it'll connect back to your phone and send the data over immediately. On your phone you can then see all your runs, as well as the pace, average heartrate, calories burned, and a few other cool measures. It can also record your sleep and give feedback on the quality of it, length, etc. but I have yet to use this feature. I sleep like a rock and can easily tell how well I slept when I wake up haha. I highly recommend this product. If you are on the fence as I was for so long, GET IT Read more

★★★★★

Great watch!!

CustomerDecember 12, 2025

Great watch, great battery. The heart rate sensor is accurate, lightweight. Read more

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★★★★★

Absolutely love this watch as an activity and wellness tool

Kelly MTDSeptember 4, 2023

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. Read more

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★★★★★

Superior over Apple Watch

MrGoodmorningAugust 12, 2025

I would like to say I came over from using a Apple Watch Series 6, and wow the difference in incredible. The display you can see at any time of the day, and the quality is amazing. The battery life lasts up to 10 days for me at a time, and I can barley tell I'm even wearing it sometimes from how light it is. Before the weight of my apple watch prevented me from comfortably sleeping with it, whereas the weight of the garmin makes it so easy to have it on without realizing you have it on. The OS is also very fast and it looks great when paired with any athletic outfit. Great value for money especially in comparison with all the competitors on the market. Read more

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