San Rafael, California · Trail
The Big Alta 2027
Distances
100K
- Distance
- 62.5 mi (101 km)
- Vert gain
- 12,750 ft (3,900 m)
- Start
- 6:00 AM GMT-7
- Cutoff
- 17 hr
Saturday. Mass start at Fort Baker, no waves and no announcements, point to point to Marinwood Park; the finish closes at 11:00 p.m.
50K
- Distance
- 31 mi (50 km)
- Vert gain
- 6,700 ft (2,000 m)
- Start
- 7:00 AM GMT-7
- Cutoff
- 9 hr
Friday. Single mass start at Marinwood Park, no waves; the finish closes at 4:00 p.m. On-course cutoffs 11:00 a.m. at mile 14.3 and 1:30 p.m. at 23.2, with a soft one at 9:25 a.m. at 9.4
| Distance | Vert gain | Start | Cutoff | Notes |
|---|---|---|---|---|
| 62.5 mi (101 km) | 12,750 ft (3,900 m) | 6:00 AM GMT-7 | 17 hr | Saturday. Mass start at Fort Baker, no waves and no announcements, point to point to Marinwood Park; the finish closes at 11:00 p.m. |
| 31 mi (50 km) | 6,700 ft (2,000 m) | 7:00 AM GMT-7 | 9 hr | Friday. Single mass start at Marinwood Park, no waves; the finish closes at 4:00 p.m. On-course cutoffs 11:00 a.m. at mile 14.3 and 1:30 p.m. at 23.2, with a soft one at 9:25 a.m. at 9.4 |
Every year
- 2027March 19, 2027 · upcoming
- 2026March 20, 2026 · completed100K: Kellen Blumberg 8:18:28 · Robyn Lesh 9:45:34; 50K: David Norris 3:43:07 · Klaire Rhodes 4:12:41