Healdsburg, CA

Come experience one of the most RELENTLESS and beautiful ultras on the West Coast, with two newly designed new courses that navigate miles upon miles of single track with majestic views of Lake Sonoma, nestled in the beauty of wine country during harvest season. The new fall date will make the LS100 perfect for runners who are looking for a late season challenge, prefer cooler weather, or want to have one last chance to snag a qualifier for the Western States Endurance Run.

The Lake Sonoma Race Series is legendary for its wine country hospitality, and the new race weekend will be no exception. The LS100K-55K weekend will be a lively scene for athletes, complete with on-site camping, live music and of course the best local food, wine and beer Sonoma County has to offer! As always, the Lake Sonoma Race Series is a community event, with proceeds from all races supporting the Children of Vineyard Workers Scholarship Fund.

Upcoming Races

Oct 19 2024
55 KM
7,060 7,060 ft.
Single Loop Course
4 Elevation Rating
Very hilly, ~7500-12,500 feet in 50 miles
2 Surface Rating
Mostly groomed trail or dirt roads
Oct 19 2024
100 KM
13,848 13,848 ft.
Out and Back Course
4 Elevation Rating
Very hilly, ~7500-12,500 feet in 50 miles
2 Surface Rating
Mostly groomed trail or dirt roads

Results

100 KM New course starting 2023

View course top times
Date Finishers Top Result (M) Top Result (F)
10/21/23 239 9:35:26 12:11:04

55 KM New course starting 2023

View course top times
Date Finishers Top Result (M) Top Result (F)
10/21/23 106 5:19:32 5:20:25
Date Finishers Top Result (M) Top Result (F)
05/28/22 70 8:59:58 11:24:48
09/05/21 46 12:15:29 13:22:58
Date Finishers Top Result (M) Top Result (F)
05/28/22 58 6:01:59 6:05:12