3 events in Santa Rosa, California

From big races to Saturday morning group runs—find trail running 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
  OpenStreetMap Google Maps
• Tri to Inspire [inspirationsports.org] [Register at runsignup.com]
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  Sun, Sep 27, 2026 at 9:00 AM

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  Tri to Inspire, formerly the DJFE Triathlon Race Series, was created to introduce the sport of triathlon to the Sonoma County community in a welcoming, inclusive way. This short-distance event is...

  Tri to Inspire, formerly the DJFE Triathlon Race Series, was created to introduce the sport of triathlon to the Sonoma County community in a welcoming, inclusive way. This short-distance event is open to all abilities and is ideal for first-time triathletes and families looking to experience a fun, supportive race environment together.

  Athletes may choose between two distance options. The Mini Sprint includes a 100-yard pool swim, a 3-mile bike, and a 1-mile run. The Sprint distance features a 400-yard pool swim, a 9-mile bike, and a 3.1-mile run. Tri to Inspire is a non-competitive, untimed event designed to help participants complete their first triathlon—or simply enjoy the experience without pressure. More experienced athletes are also encouraged to participate and will find a positive, community-focused atmosphere. The race begins with a pool swim at the Finley Aquatic Center, followed by a flat, family- and beginner-friendly bike and run course along the Santa Rosa Creek Trail.

  Each athlete’s registration includes a custom finisher medal, swim cap, and athlete goody bag. Proceeds benefit Inspiration Sports Foundation, a local 501(c)(3) nonprofit supporting youth in Sonoma County through sports camps and fitness-based programs.

  4.1 Miles 12.3 Miles Run Swim Trail Triathlon

  2060 W. College Avenue, Santa Rosa, California, 95401, United States
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• Beer City Half™ Santa Rosa [runsignup.com]
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  Sat, Feb 20, 2027 at 8:30 AM

  Description

  Wind down FeBREWary in Santa Rosa with Beer City Half™! See the sights, run the trails, and drink the brews that have made Santa Rosa famous world-round. Beer City Festival is a full day on a full weekend. Drink local and dig it! (ProTip: Capacity is limited and this event sells out.)

  1 Miles 5k 10k 13.1 Miles Run Trail

  Santa Rosa, California, 95401, United States
  OpenStreetMap Google Maps

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