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Organization Title

Trione-Annadel State Park

Phone Number

(707) 539-3911

Park Hours

8AM to Sunset.

Driving Directions to Trione-Annadel SP

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

Online reservations are not available for this park.

Upcoming Park Events

No events scheduled at this moment.


Updated: February 17, 2018

Pursuant to Superintendent's Closure Order 660-18-003, the area southeast of WP Richardson Fire Road/Canyon Fire Road will remain closed except Two Quarry Trail and the portion of Marsh Trail from Two Quarry intersection to Canyon Trail. Two Quarry and this portion of Marsh Trail were re-opened on Saturday, February 17, 2018.
This section of trail is open to all trail users.

Annadel State Park is now called Trione-Annadel State Park
Blue Flower ImageOn July 22, 2016 the California Parks and Recreation Commission (Commission) voted to rename Annadel State Park to Trione-Annadel State Park to honor Henry Trione, a Sonoma County philanthropist.

Over 60 documents exist in California State Park’s acquisition files that mention Henry Trione’s involvement in the acquisition of the Annadel property. Mr. Trione was a founding member of the Annadel Park Foundation, involved with starting the California State Parks Foundation and assisted financially with keeping Annadel open to the public in 2012.

Mr. Trione passed away in February 2015. On April 7, 2015 the Santa Rosa City Council unanimously authorized the mayor to sign letters of support renaming the park to Henry F. Trione-Annadel State Park. The Sonoma County Board of Supervisors, on May 19, 2015 unanimously supported letters to their state legislative delegation supporting the renaming to Trione’s-Annadel State Park. A request was made through Senate Concurrent Resolution No. 79 (Sept. 18, 2015) to the Commission and California State Parks to rename the state park to Trione-Annadel State Park.

New signs and literature will be produced when the department receives donations to cover the costs pursuant to SCR 79.

Park Information:

The park, 60 miles north of San Francisco on the eastern edge of Santa Rosa offers miles of trails for hiking, mountain biking, and trail riding.

For wildflower lovers, Trione-Annadel State Park offers a great variety of flowers from early Spring until early Summer, especially on a hike around Lake Ilsanjo. 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. 

  • 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.

Fishing Lake Ilsanjo offers excellent fishing for black bass and bluegill. Black bass weighing nine pounds and more have been caught here. A purple plastic worm is a favored bait for the bass, while the bluegill favor garden worms, small crayfish, and grubs. If you are 16 years of age or older, you must have a California fishing license. Ledson Marsh dries up by late August or early September and so no fish are found there.

Location - 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.

Facilities and Activities

Canyon WR trail junction

There is no camping in the park. Fires, campstoves, and barbecues are not allowed.

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.

Horses and bicycles are allowed only on designated trails. Off-trail riding is not permitted.

Drinking water should be carried on the trails. The water in Hunter Springs is suitable for horses only.

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.

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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Available Activities and Facilities at Trione-Annadel State Park

Bike Trails
Hiking Trails
Horseback Riding
Picnic Areas
Env. Learning/Visitor Center
Exhibits and Programs
Guided Tours
Interpretive Exhibits
Vista Point
Nature & Wildlife Viewing
Drinking Water Available