Annadel Half Marathon, 10K & 5K
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Annadel Half Marathon
The Annadel Half Marathon is a non-profit fundraising running event held at Spring Lake Regional Park, 5585 Newanga Avenue, Santa Rosa, California, on April 17, 2027. Over the past 17 years the event has raised funds to support Trione-Annadel State Park and the Sonoma County Parks Foundation. The course uses the scenic trails of Annadel State Park and draws runners of varied experience.
- Half Marathon - 4-hour cut-off time
- 10K - option for walkers and first-time participants
- 5K - option for walkers and first-time participants
In honor of Earth Day (April 24) the event is organized as a low waste event with cup free aid stations, refill options, and an emphasis on park stewardship. Each participant receives a race medal, an event shirt, and post-race beverages and snacks. All race registrations are final and non-refundable; race protection insurance is offered during registration.
Initial registration fees shown for early registration are $111.98 for the half marathon, $73.48 for the 10K, and $67.98 for the 5K. A portion of event proceeds is donated to Trione-Annadel State Park and the Sonoma County Parks Foundation. Visit the organization's website for the most recent information.
