Garmin Forerunner 265 Review: Strong Runner, Flawed HRV

What It Is

The Garmin Forerunner 265 is a mid-range running watch aimed squarely at dedicated recreational runners and triathletes who want serious training metrics without paying Fenix 8 or epix Pro money. It sits in the $449 launch price bracket, though by late 2025 it was regularly discounted by around 33% during sales events, making it genuinely competitive in the $300 range. The pitch is straightforward: AMOLED display, comprehensive running dynamics, and Garmin's full training ecosystem in a package lighter than the premium tier.

Key Specs

• GPS chipset: Multi-band GNSS (GPS, GLONASS, Galileo, BeiDou)
• Battery life: Approximately 13 hours in GPS mode with multi-band active; up to 24 hours in standard GPS mode; smartwatch mode reaches around 15 days
• Sensors: Wrist optical PPG-based heart rate and HRV, pulse oximetry (SpO2), skin temperature, barometric altimeter
• Display: AMOLED touchscreen, always-on capable
• Weight: 47g (standard size)
• Water resistance: 5 ATM

Performance in the Real World

The multi-band GPS on the 265 is one of its stronger selling points. In practice, it holds a clean track in urban canyons and under tree cover where single-band watches struggle. Lap splits are reliable, and distance accuracy is competitive with the Coros Pace 3 at similar price points. This is not a watch that will gaslight you about how far you ran.

Heart rate accuracy during steady-state efforts is solid. The wrist optical sensor uses PPG to detect blood volume changes through LED light, and during zone 2 runs or tempo work it tracks well against chest strap references. Where it loses ground, predictably, is at high intensity with rapid cadence changes. If you are doing interval sessions and want beat-for-beat accuracy, pair it with a Garmin HRM-Pro chest strap, which captures the heart's electrical impulses directly via ECG principle and will not be fooled by wrist motion artifacts.

The HRV situation deserves direct attention. An academic study published and discussed by The5kRunner compared the Forerunner 265's Health Snapshot feature against an ECG reference. The conclusion was a clean split: resting heart rate came out accurately, but the HRV data was judged unsuitable for research purposes and for monitoring athletes or patients. This is a meaningful caveat. If you are a coach or an athlete who makes training decisions based on HRV readiness scores, you should treat the 265's HRV output as directional at best and not as a precise physiological measurement. The Polar H10 chest strap remains the gold standard for HRV capture because it measures beat-to-beat timing from true electrical impulse detection. The 265's PPG-derived HRV simply cannot match that resolution.

Sleep tracking is functional and captures the basics: sleep stages, resting heart rate overnight, and SpO2 dips. The barometric altimeter tracks elevation accurately during trail runs rather than relying on GPS elevation data, which can be noisy. Training load, recovery time, and daily suggested workouts are all present and genuinely useful for runners following a structured plan, though there was a reported training load bug flagged as of mid-2026 that Garmin had not fully resolved at time of writing.

The AMOLED display is bright and readable in sunlight, which was not always the case for OLED watches a few years ago. Battery life does take a hit compared to transflective MIP displays. If you are running ultras regularly, the 265's 13-hour multi-band limit is a problem. For marathon and below, it is fine.

The Garmin Connect app ecosystem remains the most comprehensive in the consumer running space. Garmin Coach plans, Connect IQ apps, course navigation, live tracking, and incident detection are all here. The course import feature had a regression bug flagged in mid-2026, so if you are importing GPX files for navigation, double-check your routes before heading out.

Who It Is For / Who Should Skip It

The 265 is the right watch for runners logging 30 to 70 miles per week who want accurate GPS, a great display, and the full Garmin software stack without spending Fenix money. It is good for half marathon and marathon training blocks. If you race the occasional trail 50k, the battery is manageable with some discipline around GPS modes.

Skip it if HRV accuracy is central to your training methodology. The academic evidence is clear enough that you should not pay for that feature here if you intend to rely on it. Also skip it if you are an ultra-runner needing 20-plus hours of multi-band GPS, or if you want a titanium bezel and sapphire glass. The Fenix 8 or epix Pro 2 serve those needs. And if you are a casual fitness tracker who does not run, the 265 is overkill. A Garmin Venu 3 or even a Fitbit Charge 6 will do the job cheaper.

Verdict

The Forerunner 265 is a genuinely capable running watch let down by PPG-derived HRV that an academic study found unreliable for serious use. Buy it for the GPS accuracy, the AMOLED display, and the Garmin ecosystem. Do not buy it expecting precise HRV data without a chest strap doing the real work alongside it.