Sonoma Fall Classic
Healdsburg, United States • 17-18 Oct 2026
Sonoma Fall Classic : Lake Sonoma, California
The Sonoma Fall Classic is a multi-distance trail event at Lake Sonoma offering four options: a 100 Mile, a 50 Mile, a trail Marathon, and 4-person relays. Courses run largely on singletrack with repeated lake views and sections through wine country during harvest season. Free on-site camping is available near the start/finish on a first come, first served basis for registered participants.
Key course facts:
- 100 Mile : 100.5 miles, +25,058 ft elevation gain, 36 hour time limit.
- 50 Mile : 51.5 miles, +10,612 ft elevation gain, 16 hour time limit.
- Marathon : 26.6 miles, +5,903 ft elevation gain, 11 hour time limit.
- Relays : 100 or 50 mile options for four-runner teams.
Aid stations, drop bags, and crew access are provided at designated locations. Drop bags are transported to Start/Finish, Warm Springs, and Lone Rock; there are no drop bags for the marathon. Portable toilets are located at Start/Finish, South Lake Trailhead, Warm Springs, Liberty Glen, and Lone Rock. Pacers are allowed for the 100 Mile after mile 50 or after dark with restrictions; pacers are not allowed in the 50 Mile or Marathon. Relay teams share one bib and are responsible for transport between exchange points.
There are no gas stations near the course and road access to some aid stations includes long, winding roads with limited services. Visit the organization's website for the most recent information.