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

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.

We are happy to announce that your donations are funding trail work. Working with Redwood Trails Alliance, we completed the road to trail conversion on the Lawndale Trail in 2024, and the Channel Drive upgrade in 2025. We also support several volunteer trail work days throughout the park. In addition, we continue to provide transportation for youth environmental education initiatives within the park, and are working with TASP staff to bolster and increase program capacity.

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.