Garmin Enduro 4 launches with 320-hour GPS and 64 GB storage

Garmin announced the Enduro 4 on Tuesday, 6 October 2026, billing it as its longest-lasting GPS smartwatch with solar charging. Orders open on Friday, 9 October, with UK pricing set at £799.99 — a £30 rise on what the Enduro 3 launched at in August 2024.

The announcement came via press release from Garmin's base in Olathe, Kansas, and positions the Enduro 4 squarely at ultra-runners, trail athletes and expedition hikers who need a watch capable of lasting through events that stretch across multiple days.

What you're actually getting

The hardware will look familiar to anyone who already owns an Enduro 3. Garmin has kept the same 51mm case, the same titanium bezel, the same Power Sapphire lens, and the same 1.4-inch colour transflective MIP touchscreen running at 280 × 280 pixels. The sensor suite — multi-band GNSS with SatIQ, optical heart rate, ECG, SpO2, barometric altimeter, compass, accelerometer, gyroscope, temperature sensor and ambient light sensor — is also unchanged, as are the Bluetooth, Wi-Fi and NFC (Garmin Pay) connectivity options. There is no cellular radio, no microphone and no speaker.

What has changed is storage and software. Garmin has doubled internal storage from 32 GB to 64 GB, added 50% more RAM, and moved the watch onto the Fenix 9 generation's processor and map engine. The company says map panning is now 30% faster, and a new perspective view gives runners and hikers more detail both close-up and further ahead on the trail.

The Enduro 4 also arrives with a new ComfortFit fabric strap and QuickFit release — a first for the Enduro line, which previously shipped with an ultra-light elastic nylon loop. The change pushes total weight from 63 grams on the Enduro 3 to 66 grams on the Enduro 4, though the watch body itself stays at 57 grams. The included medium band fits wrists from 145 to 220 mm; buyers with wrists smaller than 145 mm should note that is narrower at the small end than the Enduro 3's 127–225 mm range.

Battery: same headlines, important small print

Garmin claims up to 320 hours of GPS activity tracking with solar charging in the extended battery setting, and up to 90 days in smartwatch mode — figures that match the Enduro 3 exactly. Maximum-accuracy activity tracking reaches 60 hours, or 90 hours with solar assistance.

Those numbers come with significant conditions attached. Garmin calculates them assuming continuous exposure to 50,000 lux — the kind of bright, open-sky sunlight rarely sustained in the UK, particularly through autumn and winter. UK users should treat the solar figures as best-case ceilings rather than everyday expectations.

Software: the real story of this upgrade

The Fenix 9 software platform brings a meaningful jump in training tools. Chief among them is Garmin Epic, a new feature that stitches performance and health data from a multi-day activity — an ultra-race or a multi-day mountain expedition, for example — into one continuous view rather than splitting it by calendar day. Athletes can review and share how an entire event played out as a single data record.

Grade-adjusted tools arrive in a more complete form than before. The Enduro 4 offers grade-adjusted pace-based workout targets and real-time grade-adjusted rolling pace. New stamina zones show how remaining stamina affects an ongoing activity, while a stamina curve tracks how endurance changes over time based on training history and current fitness.

Rucking and rowing receive updates too, with adjustable pack weight metrics added to rucking and enhanced analytics for indoor rowing. It is worth noting that Garmin has confirmed Epic, Stamina Zones, and the rucking and rowing updates will roll out to the Fenix 8 series and other compatible existing watches — meaning current Garmin owners may receive some of these features without buying new hardware.

Susan Lyman, Vice President of Consumer Sales and Marketing at Garmin, said: "As interest and participation in ultra-endurance activities continue to grow, Enduro 4 is designed for athletes and adventurers who want gear they can trust to perform through every mile, every climb and every challenge. Intuitive features like comprehensive power modes make the most of the long-lasting battery life, while grade-adjusted metrics add a new dimension to preparing for hilly or mountainous terrain."

How it fits the market

Multiple reviewers have characterised the Enduro 4 as more of an "Enduro 3.5" than a clean-sheet successor — the case, display and battery headline figures are all carried over. Coverage has also noted the watch as a near-direct competitor to the Apple Watch Ultra 4 within its price bracket.

For UK buyers weighing the decision, the picture is this: if you own an Enduro 3 and the software features are not essential to your training, there is little hardware reason to upgrade. If you are buying new, the Enduro 4 costs £100 more than Garmin's current UK price for the Enduro 3, and delivers double the storage, the faster map engine and the full Fenix 9 software set from day one — along with two additional years of guaranteed security updates compared with the older model.

Price, availability and key specs at a glance

• UK price: £799.99 | US: $899.99 | EU: €899.99
• Orders open: 9 October 2026 (UK and US); Australia from 10 October at AU$1,449.00
• Case: 51mm, fibre-reinforced polymer with titanium bezel and Power Sapphire lens
• Display: 1.4-inch colour transflective MIP touchscreen, 280 × 280 px
• Storage: 64 GB
• Water rating: 10 ATM
• Weight: 66 g
• Battery (solar, extended mode): Up to 320 hours GPS activity; up to 90 days smartwatch
• Connectivity: Bluetooth, Wi-Fi, NFC (Garmin Pay) — no cellular