Annadel Half Marathon, 10K & 5K

APR
17
2027
Annadel trail event on April 17, 2027 featuring a half marathon, 10K and 5K with over 1,500 feet of elevation gain and a cup free policy.
Sat 17 Apr 2027
Half Marathon 10 kilometers 5 kilometers

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Annadel Half Marathon, 10K & 5K

The Annadel event on April 17, 2027 is a non-profit fundraising race that has raised funds over the past 17 years to improve the park. Registration is now open.

Race distances:

  • Half Marathon (trail, hilly and technical)
  • 10K
  • 5K (out and back on a gravel fire road)

The half marathon course runs from the Spring Lake Oak Knolls picnic area, winds through Spring Lake Park, then climbs into Annadel State Park. The course is hilly and technical, with more than 1,500 feet of elevation gain over rocky and rooted terrain. Participants will pass green meadows, wildflowers, and a variety of trees.

The 5K follows a gravel fire road slightly into Annadel State Park and returns along the same route. The event is cup free; participants are asked to bring a personal bottle or reusable cup.

Proceeds benefit park improvements. The event includes sponsors and local partners. Visit the organization's website for the most recent information.

Half Marathon
Half Marathon
10 km
10k
5 km

Events nearby

A multi distance trail event at Lake Sonoma on October 17-18, 2026 featuring 100 mile, 50 mile, marathon and four person relays with aid stations and free camping.
Trail race at Bothe-Napa Valley State Park on October 24, 2026 offering marathon, half marathon, 10K, 5K and virtual options with a 300-runner field limit.
40th annual 6.45-mile trail race in Annadel State Park on November 1, 2026, with staggered head starts, awards for the top 13, and limited registration.
Trail marathon, half marathon, 10K and 5K through Bothe Napa Valley State Park on single track with streams and hills, field limited to 300 participants.
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