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Registration is closed

Registration opens

April 19, 2022 1:00 AM

Registration is open until

May 20, 2022

Saturday, May 28, 2022

November 20, 2021

from 5:15 on race morning

We are excited to announce we've handed the reins for the Lake Sonoma 100k over to The Healdsburg Running crew. Please visit https://ultrasignup.com/register.aspx?did=98833

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View the 2023 Athlete Guide

Saturday, May 28, 2022

November 20, 2021

from 5:15 on race morning

Download the 2021 Athlete Guide Here.

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We make sure to provide safe and effective racing protocols ensure your health and safety.

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