Friends of Trione-Annadel is the nonprofit dedicated to protecting the health of our treasured local state park, Trione-Annadel. Through donations from our community, we support the maintenance and development of its trails, structures, and open spaces - ensuring a healthy environment for wildlife and continued accessibility for the public.

We want to offer one more BIG THANK YOU to everyone who joined and supported the Friends of Trione-Annadel 3rd Annual Fundraising ‘Virtual’ Event!  The fundraiser was a success by all accounts, and we credit our amazing community for stepping up and showing how much Trione-Annadel State Park is loved!

Our social media channels and community newsletters will be buzzing in the coming days as we have many exciting projects on the horizon - starting with the launch of our new Community Benefits program!

SIGN UP TODAY and be among the first to join this BRAND NEW initiative designed to create year-round support for Trione-Annadel State Park! 

We're just getting started, 2022 is going to be a banner year for Friends of Trione-Annadel!


Friends of Trione-Annadel was created in September 2017 in response to increasing maintenance needs of a highly used recreational.

Trione-Annadel State Park has over 45 miles of official trails and hosts 12-13,000 people per month of all types - hikers, mountain bikers, runners, equestrians, and more.

To support the preservation and maintenance of this unique natural resource, Friends of Trione-Annadel was formed with the intent to protect park resources and deliver a high-quality visitor experience. Read more


With support from many generous donors, Friends of Trione-Annadel has funded numerous projects benefiting the park. Recent projects included the installation of 17 new Kiosks (donated by the Trione family) throughout the park and the completion of repairs to the dam at Lake Ilsanjo.

Our goals for 2022 include supporting completion of approved trail work on Channel, Two Quarry, and Lawndale trails and educational opportunities for grammar school programs throughout Sonoma County.

Read more


Trione-Annadel State Park is situated at the northern edge of Sonoma Valley and is adjacent to Spring Lake Regional Park in the City of Santa Rosa. Within its 5,200 acres and 40+ miles of hiking, biking and equestrian trails, it offers many recreational and wildlife viewing activities.

Trione-Annadel State Park's interconnected trail system includes an 8.5 mile section of the Bay Area Ridge Trail. The park’s trails are a popular destination for runners, hikers, mountain bikers and equestrians. Read more

Powered by Wild Apricot Membership Software