Annadel Half Marathon, 10K & 5K
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Annadel Half Marathon - Spring Lake Regional Park
The Annadel Half Marathon is a nonprofit fundraising event held at Spring Lake Regional Park in Santa Rosa, California on April 17, 2027. A portion of event proceeds is donated to Trione-Annadel State Park and the Sonoma County Parks Foundation. The event has operated for many years to support improvements and stewardship of the park.
The event offers these distances:
- Half Marathon with a four-hour cut-off time
- 10K
- 5K
The courses use the scenic trails and surroundings of Annadel State Park. The event emphasizes low-waste practices in honor of Earth Day, including cup-free aid stations, refill options, and a focus on park stewardship. Each participant receives a race medal, an event shirt, and post-race beverages and snacks.
Registrations are final and non-refundable; race protection insurance is offered as an option during registration. The event notes that the Half Marathon, 10K, and 5K draw participants from across Sonoma County and the surrounding area and serve as a community fundraising effort to help maintain the park. Visit the organization's website for the most recent information.
