Contact Number

  • (707) 539-3911

Park Accessibility Information

Park Hours

  • 8AM to Sunset.

Park Activities

Dogs allowed only in developed areas like Channel Drive. Dogs not allowed on trails, dirt roads, or in backcountry.
Picnic Areas
Env. Learning/Visitor Center
Exhibits and Programs
Guided Tours
Interpretive Exhibits
Vista Point
Nature & Wildlife Viewing
Bike Trails
Hiking Trails
Horseback Riding

Park Facilities

Drinking Water Available

Park Directions

Get directions through Google Maps

The park is east of Santa Rosa and south of Highway 12 on Channel Drive via Montgomery Drive. 6201 Channel Drive Santa Rosa, California, 95409

House imagePark Information

Trione-Annadel State Park is situated 60 miles north of San Francisco on the eastern edge of Santa Rosa, in the beautiful Valley of the Moon. The park offers miles of trails for hiking, mountain biking, and trail riding.

A hike around Lake Ilsanjo provides great opportunities for wildflower lovers during the spring/early summer months. The best months to see the park's wildflowers are April and May, but there are some plants in bloom as early as January and as late as September. 

Cyclist at the park

  • Dogs are not allowed on trails. Dogs are allowed on a leash under your control only on Channel Drive (a paved road) within the park.
  • Model Aircraft (“drones”)/Unmanned Aircraft Systems (UAS)/Glider Use is not allowed in the park per Bay Area District Order No. 660-16-036.
  • Electric-Assist or “E-bikes” are considered motorized vehicles and are not allowed in the park.

Lake Ilsanjo offers excellent fishing for black bass and bluegill. If you are 16 years of age or older, you must have a California fishing license. Fishing is not encouraged at Ledson Marsh. 

Tri-County Partnership to Create a Cleaner Coast

MARIN, SONOMA AND MENDOCINO COUNTY PARTNER TO CREATE A CLEANER COAST Teaching Leave No Trace Practices to Growing Visitor Audiences in Coastal Communities. Learn more by reading the Tri-County Partnership Press Release (6/15/2022).

Pretty Face imageLocation-Directions

The park is east of Santa Rosa and south of Highway 12 on Channel Drive via Montgomery Drive. 6201 Channel Drive Santa Rosa, California, 95409
Latitude/Longitude: 38.4292 / -122.6236

Seasons/Climate/Recommended Clothing

  • Temperatures during the Summer are in the 80s and 90s.
  • Wintertime highs are in the 50s.
  • Rainfall averages about 30 inches a year, most of it during the winter and early spring.
  • Snow is quite rare, and there is little fog.

Tips for Recreating at Trione-Annadel and More Activities

Canyon WR trail junction

  • There is no camping in the park.
  • Fires, campstoves, and barbecues are not allowed.
  • Note that all plants and wildlife within the park are protected.  
  • Collecting or destroying anything in the park, including mushrooms, is prohibited.
  • Horses and bicycles are allowed only on designated trails.
  • Off-trail riding is not permitted.
  • Motor vehicles are allowed only on the entrance road and in the parking lot within the park.
  • Dogs are allowed only on Channel Drive and in the parking lot. They must be kept on leash at all times and are not allowed on the trails.

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  • Campsites are available at the county campground at Spring Lake and at Sugarloaf Ridge State Park, about ten miles east of Annadel via Highway 12 and Adobe Canyon Road.
  • Drinking water should be carried on the trails. The water in Hunter Springs is suitable for horses only.
  • Lock your car and take your valuables with you.
  • Don't Litter! If you bring it in, take it back out.

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