A 104km overnight loop around Spain's Sierra de Guadarrama National Park
The Gran Trail Peñalara 104K is the flagship race of Spain's most storied mountain ultramarathon. Starting and finishing in Navacerrada under the stars at 23:30, the course circumnavigates the Sierra de Guadarrama in a 104km loop through the heart of a national park. Runners climb past La Maliciosa, descend into the Lozoya valley at Rascafría, ascend to the 2,428m summit of Peñalara, and return via La Granja and Guarramillas — accumulating 5,100m of vertical gain across mountain singletrack, forest roads, and brief stretches of tarmac. Held since 2010 and recognized as a UTMB 100K Index race awarding 6 ITRA points, the GTP is a cornerstone of Spanish ultra trail culture.
Experienced ultrarunners
Navacerrada, Madrid, SpainOctober 09, 2026
Gran Trail Peñalara 104K is a loop trail race in Navacerrada, Madrid, Spain, held on October 09, 2026. The course covers 104 km, climbs 4,882 m, and has a 24h30m cutoff.
| Location | km | Elevation | Cutoff | Crew | Drop bags |
|---|---|---|---|---|---|
Start Start | 0.0 | 1,191 m | — | ||
Finish Finish | 101.6 | 1,203 m | 24h30m12:00 AM +2 |
Aid station details for this race are still being filled in. Cutoffs and access rules come from the race’s own published information and can change — check the official race details before planning around them.
Sign in for race-day weather at every station, points of interest, segment-by-segment analysis, pacing, and to save this race to your calendar.
Course reaches 2,428m at Peñalara peak with significant time above 2,000m on exposed ridgelines
October nights above treeline can drop below freezing; thermal layers and full waterproofs are mandatory gear
Mountain weather in October changes rapidly; thunderstorms and wind are common on exposed high terrain
No required gear specified
No recommended gear specified
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