Skyrace · Spain
Expected Sun, 16 May 2027 · Zegama, Basque Country
The cathedral of mountain running. A brutal 42 km loop through the Basque mountains with 5,400 m of combined elevation change. Where the sport's legends are made.
2027 date is estimated
The organizer has not announced the next date yet. This estimate keeps planning useful without presenting it as official.
The mapped GPX is carried forward from 2026 until the new course is verified. Use it for course research, then re-check before race day.
Date sourceEntry · 42K · 2027 edition
The entry facts on file are for the 2026 edition (by draw (lottery)), checked 27 Sep 2026. Dates, method and places for 2027 can differ.
From the organizer's page, checked 27 Sep 2026. TrailSplits does not know whether you have a place; the organizer is the final word.
Zegama-Aizkorri is a skyrace expected around Sun, 16 May 2027 in Zegama, Basque Country, Spain. TrailSplits currently includes one mapped course for this event, with course maps, elevation profiles, weather context, and pacing tools for the uploaded GPX data.
How to get a place: 500 places: 150 held by the organisers and 125 for returning runners and the fastest recent times; the other 225 go by public draw. For 2026: pre-registration 12–23 January on Kronoak, draw on 20 February, fee 75 €. The 2027 dates are not published yet. Organizer's page, checked Sunday 27 September 2026.
TrailSplits is a free, independent route & pacing companion — not the official race. Visit the official Zegama-Aizkorri site →
Racing more than once next year? Add 42K to a season and see whether your races work together.
Inspect the official course track on a topographic map, through its elevation profile, or in 3D.
› running direction two lines: out and back on the same path kilometres
Selected distance
Vert-focused blueprint with route-finder links into the Planner.
Prepare and return
Keep this course, its training plan, calendar and future course updates together in your private My Races page. Saving does not publish your workouts, pace or progress.
Zegama-Aizkorri 42K — 2025 edition. 2800 finishers.
Estimated finish-time percentiles, modeled from the 2025 winning (3h 38m) and median (6h 30m) times — a guide, not official splits.
Race route lab
Open the official course in Planner, then choose a nearby start point to build a shorter loop that matches the course demand. This course averages about 62.8 m climb per km.
Expected Sun, 16 May 2027
Send to your watch
Get the official course as a clean GPX or a Garmin TCX course, with step-by-step instructions to load it onto a Garmin, COROS, Suunto, Wahoo, or Komoot — free, no account needed.
Compare your training
See how faithfully your rehearsal route matches the real race. The official course for 42K loads as Route A — upload your training route to compare distance, elevation gain, estimated time, and how much of the course you actually cover.
Course analysis
See the 42K course broken into its major climbs and descents in order — length, gain, average grade, and steepness — so you know where the crux is and how to pace and fuel it.
Race-week reminders
A free browser notification in the final week — the course crux, the weather window, and loading the GPX onto your watch. No app, no email, no account.
Zegama-Aizkorri 2027 is expected on Sun, 16 May 2027 in Zegama, Basque Country. Check the official race site for registration deadlines and final details.
42.4 km with 2,661 m climb. The longest course is 42.4 km with about 2,661 m of vertical gain — a demanding mountain course.
The 42K course has a 8-hour cut-off, an average of 11.3 min/km to finish in time. TrailSplits' cut-off pacer shows the buffer at each aid station.
Yes. TrailSplits gives you the course map, an interactive elevation profile, a 3D flyover and a downloadable GPX for every mapped distance — free and with no sign-up.
Each distance has a free, course-specific 16-week training plan built around its distance, vertical gain and cut-offs, plus a pace and cut-off calculator.
No. TrailSplits is a free, independent route and pacing companion. For registration and official rules, visit https://www.zegama-aizkorri.com.
Load the GPX directly into TrailSplits for surface analysis and terrain intel.
Install TrailSplits — a free app you add straight from your browser — and download the 42K course to your phone. Explore the route and elevation offline before race day, then follow it with no signal on the day. No app store, no account, no subscription.