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4worldlovers: North Sonoma Mountain Regional Park and Open Space Preserve is an 820-acre park located about 5 miles southeast of Santa Rosa. The park includes a 4-mile section of the Bay Area Ridge Trail, which connects to adjacent Jack London State Historic Park.

The North Sonoma Mountain Ridge Trail is approximately 4 miles and climbs to nearly 2,000 feet, connecting to the western boundary of Jack London State Historic Park. This trail appeals to hikers seeking a moderate to the strenuous outing. Hikers wanting an easier walk can return at any point before reaching Jack London.

The trail begins near a grove of coast redwoods and a footbridge over the south fork of Matanzas Creek. It crosses open fields, and through gradual switchbacks, climbs the mountain's north slope through stands of oaks and bay laurels and fields of native bunchgrass.

Most of the trail is forested though some sections open to stunning views of the Santa Rosa Plain, Bennett Valley and Sonoma Valley. At points, hikers are treated to 180-degree views of Taylor and Bennett mountains, Mount Saint Helena, Hood Mountain, Sugarloaf Ridge and other North Bay peaks. Winter and spring hikers will see vernal pools and colorful wildflowers. At the connection with Jack London, hikers can continue into the state park and explore its 26-mile trail network.

The trail is a piece of the larger Bay Area Ridge Trail, an evolving effort to create 550 miles of continuous public trail ringing San Francisco Bay. Segments of the Bay Area Ridge Trail also are located within Jack London. With the opening of North Sonoma Mountain, there are now about 9 miles of Bay Area Ridge Trail on the mountain.

The Umbrella Tree Trail is a steady climb of about 1 mile to a giant California bay tree cluster and gorgeous views. The trail begins near the accessible parking area above the ranger residence and follows a former ranch road through forests of oaks and bays. Most of the climb is shaded, but the last section opens to expansive grasslands.

Hikers will find the Umbrella Tree standing sentinel at the edge of the mountain, at an elevation of about 1,500 feet. To the west are uninterrupted views of Santa Rosa, to the north are sweeping views of Bennett Valley, and adjacent to the tree is a lone picnic table perfect for taking in the sights.

Trail Notes: Bring your own water. Water is not available in the park. Trails are open to hikers, bikers, and equestrians, though bikes on the Ridge Trail are limited to the first 2 miles. We recommend equestrians first visit without their horses to acquaint themselves with the park entrance and trailer access.

North Sonoma Mountain Regional Park and Preserve stretches from south of Bennett Valley to the western boundary of Jack London State Historic Park in Glen Ellen. The park entrance is about 5 miles southeast of Santa Rosa.

With its peak rising nearly 2,300 feet, Sonoma Mountain is a defining feature of central Sonoma County. This park, which opened in 2015, provides the first regular public access to the mountain's north slope.

Sonoma Mountain is about equal distance from Santa Rosa, Rohnert Park, Petaluma, and Sonoma. It is one of several high points in the range known as the Sonoma Mountains, with the others being Taylor Mountain, Bennett Peak, the east ridge of Tolay Lake Regional Park, and Cougar Mountain. The east side of Sonoma Mountain is the backdrop for Sonoma Valley, and the west side rises along Highway 101 between Santa Rosa and Petaluma.

The park includes the headwaters to two branches of Matanzas Creek, the only remaining coast redwood groves on the mountain's north side, large areas of continuous oak woodlands, and a vernal pool with a rare buttercup plant species.

The park supports the Sonoma Valley wildlife corridor, providing habitat for mountain lions, bobcats, golden eagles, western pond turtles and other animals.

The park entrance is along Sonoma Mountain Road just east of Pressley Road.

4worldlovers: 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.

MARIN, SONOMA AND MENDOCINO COUNTY PARTNER TO CREATE A CLEANER COAST Teaching Leave No Trace Practices to Growing Visitor Audiences in Coastal Communities.

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

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.

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.

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.