Garmin Forerunner 265 Review: Strong Runner, Shaky HRV

What it is

The Garmin Forerunner 265 is a mid-range running watch aimed squarely at serious recreational runners and triathletes who want Garmin's training ecosystem without paying fenix or Epix Pro prices. It sits in the $449 bracket at launch, though by late 2025 it was regularly appearing at around 33% off during sales events, bringing it closer to $300. That pricing makes it one of the more compelling options in the crowded mid-tier running watch segment, competing directly with the Polar Pacer Pro and other mid-range GPS watches in its class.

Key specs

• GPS chipset: Multi-band GNSS (GPS, GLONASS, Galileo, BeiDou)
• Battery life: Approximately 20 hours with GPS and music, up to 24 hours in standard GPS mode, and up to 49 hours in battery saver GPS mode
• Sensors: Wrist-based PPG optical heart rate, HRV via PPG beat-to-beat intervals, SpO2 optical blood oxygen, barometric altimeter for pressure-based altitude tracking
• Display: AMOLED color touchscreen, always-on capable
• Weight: Approximately 47g (standard size)
• Water resistance: 5 ATM

Performance in the real world

The Forerunner 265 gets a lot right. Multi-band GNSS delivers GPS tracks that are tight and reliable in most conditions, urban canyons included. Pace data during tempo efforts and interval sessions is responsive and consistent. Garmin's running dynamics, training load, and recovery advisor features are genuinely useful if you put in the time to understand what the numbers mean. The AMOLED display is a real upgrade from older Forerunner LCD panels: bright, readable in sunlight, smooth to scroll through.

Resting heart rate from the wrist PPG sensor is solid. An academic study referenced by The5kRunner directly compared the Forerunner 265's Health Snapshot feature against an ECG reference and concluded that resting heart rate accuracy is good. That is genuinely useful to know, since many reviewers just eyeball comparison charts without any rigorous baseline.

Here is where things get uncomfortable: that same study found the HRV data from the Forerunner 265 unsuitable for research purposes and unsuitable for monitoring athletes or patients. This is not a small asterisk. HRV is one of the headline wellness metrics Garmin markets heavily, and it feeds into recovery scores, Body Battery, and training readiness numbers. The PPG sensor measures blood volume changes via LED light reflected from your wrist, and deriving accurate beat-to-beat intervals from that signal is genuinely hard, especially during movement or with poor skin contact. Chest straps like the Polar H10 detect electrical impulses directly from the heart and produce far cleaner HRV data. The Forerunner 265 cannot match that accuracy at the wrist. If you are making training decisions based on Garmin's HRV-derived recovery scores, you should apply some skepticism to those numbers.

Sleep tracking is functional and gives you a reasonable broad picture: time asleep, sleep stages, overnight SpO2 trends. It is not a clinical tool and should not be treated as one. The SpO2 sensor uses optical measurement of blood oxygen saturation and works well enough to flag obvious anomalies, but the data variability is typical of wrist-based optical sensors across all brands.

The barometric altimeter handles elevation tracking better than GPS-only altitude calculations, which is important for trail runners and cyclists doing hilly routes. GPS elevation is notoriously noisy; the pressure-based approach gives you smoother, more credible ascent and descent numbers.

Garmin Connect remains the strongest training app ecosystem in this segment. Structured workouts, race predictor, performance condition, and integration with third-party platforms like Strava and TrainingPeaks all work reliably. Compared to the Polar Pacer Pro, Garmin simply has more depth in its analytics. If running-specific metrics and battery life are your priorities, the Forerunner 265 is a strong choice in the mid-range GPS watch category.

Who it's for / who should skip it

Buy this watch if you are a runner or multisport athlete who wants reliable GPS, a great display, and access to Garmin's full training ecosystem at a mid-range price point. It is particularly good value when you catch it at 30% or more off retail, which happened consistently through late 2025.

Skip it if your primary reason for buying a fitness watch is HRV-based recovery monitoring. The academic data is clear: the HRV numbers from this watch are not reliable enough to guide serious training decisions. If HRV accuracy matters to you, pair any watch with a Polar H10 chest strap during workouts, or look at devices that are more transparent about optical HRV limitations. Also skip it if you want a full smartwatch experience with rich third-party apps; the Forerunner 265 is a runner's tool first.

Verdict

The Forerunner 265 is a very good running watch held back by overpromising on HRV accuracy, a weakness now backed by independent academic research rather than just reviewer suspicion. Buy it for the GPS, the AMOLED screen, and the training tools. Ignore the Body Battery and HRV recovery scores, or at least treat them as rough indicators rather than reliable data.