Sonoma Fall Classic
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Sonoma Fall Classic
The Sonoma Fall Classic is a multi distance trail running event at Lake Sonoma near Geyserville, California, held October 17-18, 2026. The event includes solo and team options on established Lake Sonoma trails and facilities.
Distances offered
- 100 Mile (100.5 miles, 36 hour time limit, +25,058 ft elevation gain)
- 50 Mile (51.5 miles, 16 hour time limit, +10,612 ft elevation gain)
- Marathon (26.6 miles, 11 hour time limit, +5,903 ft elevation gain)
- Relays (100 or 50 miles for four runner teams)
Courses use long sections of singletrack, substantial elevation change, water crossings on some routes, and views of Lake Sonoma and surrounding wine country. The 100 mile uses a two lap format of a 50 mile loop that begins with a steep climb at Pritchett Peaks and includes multiple aid stations and turnarounds. The marathon follows a Lake Sonoma loop with a fast downhill finish from Little Flat.
Logistics include designated aid stations with crew access at Start/Finish, Warm Springs, Liberty Glen and Lone Rock, portable toilets at several locations, and drop bag transportation to select stations. Pacers are allowed on the 100 mile after mile 50 or after dark with requirements; pacers are not allowed in the 50 mile or marathon. Free on site camping is available for registered participants on a first come, first served basis. Registration for the 2026 event opens January 1, 2026 and closes October 12, 2026; shirts are guaranteed if ordered by September 15. Visit the organization's website for the most recent information.
