Lake Sonoma 100K


Oct 19, 2024 at 5:00 AM

Lake Sonoma 100K

3333 Skaggs Spring Road

Geyersville CA, 95441


Entry Fee $100
(Lowest or Early Registration)

Prize Money: no


  • 100K

Series: Lake Sonoma Race Series

Type: Ultra

Starting Elevation: 200

Percent of the course on un-paved trails: 90%

First Year of the Event: 2021

Men's Record: Ruairi Moynihan, 12:15:29 (2021)

Women's Record: Susan Oh, 13:22:58 (2021)


The race in this beautiful wine country event consists of nearly 90
percent single-track trails weaving through relentless rolling hills, testing runners
with three big climbs, and traversing more than a dozen creek crossings. The race
is well-known for is known for having one of most competitive fields in the United
States according to UltraRunning magazine.

Western States qualifier and finishers will earn four (4) UTMB points


Race event photo


Past Event Dates

Held on Oct 19, 2024

Held on Oct 21, 2023

Held on May 28, 2022

Held on Sep 05, 2021

Event Results

View 2022 Results

View 2021 Results