Ultra Running Hub Osses, France · Saturday, September 19, 2026
Lazken Trail
We hold no course length for this race — a timed or backyard event is measured by the clock, not the kilometre — so there is no Grit score to give you.
What the course asks
DUV results for the 2024 edition (25h) — ranked runners only. Starters are not published, so the field was at least this big and no finish rate can be given.
Typical conditions, September
Regional 2001-2020 average for September — NASA POWER, grid elevation 621 m. Not a forecast.
The Aid Station
Course-specific beta from the community
With trail terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for this trail race with 230 m of ascent.
- Trail Running ShoesCushioning on trail that is still there in the last quarter.
- Race NutritionSelf-supported fuelling between aid stations.
- Hydration VestsFlask capacity without the bounce.
- HeadlampsA 25 h limit puts you out there after dark.
- GPS WatchesBattery life first — an ultra outlasts most full-GPS modes.
Course Notes
course de trail d'une distance illimitée de type Backyard, sur une boucle de 6.25km, au cœur du pays basque sur les sentiers des crêtes surplombant les villages d'Irissarry et d'Ossès, avec une vue imprenable sur les massifs du Baigura et du Jara.
Similar races
Other trail ultras of the same format.