Sonoma Fall Classic
Healdsburg, United States • 17-18 Oct 2026
Sonoma Fall Classic
The Sonoma Fall Classic is a multi distance trail running event at Lake Sonoma in Geyserville, California. It is presented by Aravaipa Running in partnership with local organizations and combines established Lake Sonoma courses with new race options.
Distances offered
- 100 Mile
- 50 Mile
- Marathon
- 100 Mile Relay (4 person)
- 50 Mile Relay (4 person)
The 100 Mile course is 100.5 miles with a 36 hour time limit and an estimated +25,058 feet of elevation gain. The Lake Sonoma 50 covers 51.5 miles with a 16 hour limit and about +10,612 feet of gain. The trail marathon is 26.6 miles with an 11 hour limit and roughly +5,903 feet of gain. Relay teams run the same loop segments with specified exchange locations.
Course terrain includes extended singletrack and lake views set in wine country during harvest season. Aid stations, portable toilets, and drop bag transport are provided at designated locations including Start/Finish, Warm Springs, and Lone Rock. Pacers are allowed for the 100 Mile after mile 50 or after dark subject to bib and waiver requirements. Free on site camping is available for participants on a first come, first served basis. Crews should note that some access roads are winding and there are no gas stations near the course. Visit the organization's website for the most recent information.