3 events in Santa Rosa, California

From big races to Saturday morning group runs—find half marathon events and connect with the local endurance sports community.

• Annadel Half Marathon [annadelhalfmarathon.com] [Register at raceroster.com]
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  Sat, Apr 18, 2026 at 9:00 AM

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  Annadel Half Marathon/10K/5K

  The Annadel Half Marathon, 10K, and 5K

  The Annadel Half Marathon is a non-profit fundraising event that, over the past 15 years, has raised significant funds to help make...

  Annadel Half Marathon/10K/5K

  The Annadel Half Marathon, 10K, and 5K

  The Annadel Half Marathon is a non-profit fundraising event that, over the past 15 years, has raised significant funds to help make Trione-Annadel State Park a more beautiful place for everyone to enjoy. Thanks to the incredible support of our sponsors, participants, and volunteers, this race has become one of Sonoma County’s premier running traditions — and we’re excited to return in 2026!

  The Half Marathon, 10K, and 5K are among the biggest running events in Sonoma County, drawing runners of all levels to the scenic trails of Annadel State Park.

  • Half Marathon: 4-hour cut-off time

  • 10K & 5K: Great options for walkers and first-time participants

  Each participant receives a race medal, a event shirt, and post-race beverages and snacks.

  Join us for a day of running, community, and supporting the park we all love!

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  Protect the Place You Race

  In honor of Earth Day (April 22), we’re proud to host a low-waste event with cup-free aid stations, refill options, and a focus on park stewardship — because every mile should leave Annadel better than we found it.

  A portion of event proceeds is donated to Trione-Annadel State Park and the Sonoma County Parks Foundation.

  Please note that all race registrations are final and non-refundable. We encourage participants to consider purchasing race protection insurance during registration for added peace of mind.

  5k 10k 21k Half Marathon Run Trail Walk

  Canyon Trail, Santa Rosa, California, 95409, United States
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• Santa Rosa Marathon [finishers.com] - Facebook - Instagram
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  Sat, Aug 22, 2026

  Description

  Ready to push your limits and live an unforgettable experience?🤩 Come join the Santa Rosa Marathon! If you're passionate about running, whether you are a sprint enthusiast or an experienced marathoner, there's a distance for every runner: from the 5K to the marathon.🏃‍♂️

  5k 10k Half Marathon Marathon Run

  Santa Rosa, California, United States
  OpenStreetMap Google Maps
• Santa Rosa Marathon [santarosarun.com]
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  Sun, Aug 23, 2026

  5k 10k Half Marathon Marathon Run

  Unnamed Road, Santa Rosa, California, 95402, United States
  OpenStreetMap Google Maps

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