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Trione-Annadel State Park: A Wild Paradise

Explore Trione-Annadel State Park on the eastern edge of Santa Rosa.

Get away from it all in Trione-Annadel State Park, which boasts 5,092 pristine and largely undeveloped acres on the eastern edge of Santa Rosa, in the heart of Sonoma County.

And — thanks to more than 40 miles of multi-use trails geared to hikers, mountain bikers, and horseback riders — you can explore much of this wonderful place on your own. There's lots to see.

Trione-Annadel's hilly terrain supports seasonal streams, meadows, redwoods, grasslands, a 26-acre lake, dense chaparral, volcanic rock formations, and what many biologists consider to be a prime example of undisturbed northern oak woodlands.

This wide variety of ecosystems creates welcoming habitat for lots of wildlife, including the commonly seen black-tailed deer, western gray squirrel, skunk, opossum, coyote and raccoon, as well as the more rarely-seen bobcat and mountain lion.

Man-made Lake Ilsanjo holds bluegill, black bass, and largemouth bass. And in the park's Ledson marsh, you might glimpse a red-legged frog, which is a threatened species.

Birds commonly sighted in Annadel include the western scrub jay, Steller’s jay, wild turkey, wood duck, acorn and pileated woodpeckers, pygmy owls, black phoebe, and dark-eyed junco.

Wildflowers bloom as early as January and run into September, but the really magnificent displays tend to occur in spring — particularly in April and May. You’ll find lupines, blue-eyed grass, popcorn flower, poppies, buttercups, bluedicks, shooting stars, iris, zigadene, hound’s tongue, linanthus, and more. Maybe you’ll even spot a fairy slipper orchid.

Plan your hiking visit by downloading the Trione-Annadel brochure with trail map. Most of the trails connect, allowing you to design a hike to your liking. The elevation low-to-high chart can help you hone that hike to perfection.

Channel Trail, which only rises from 344 to 390 feet, is relatively flat — perfect for a hiking newbie or a low-energy day. Lawndale, rising to 1,236 feet from a mere 482, will provide a challenge for more experienced hikers.

Other ways to enjoy Trione-Annadel:

  • Bring a picnic. Tables are scattered about the Park, offering a range of lovely views (some tables are arranged around the lake).
  • Go fishing at Lake Ilsanjo. Anglers more than 16 years old must carry a California fishing license.
  • Check out Wymore Quarry. Follow Cobblestone Trail to Wymore Quarry where, at one time, cobblestones were taken away on a gravity-powered, narrow-gauge railway. In the late 19th century and into the early 1920s, cobblestones were quarried here for construction projects in San Francisco, both before and after the 1906 earthquake.
  • Use accessible tables. The quarry lot also contains an accessible portable restroom and one parking spot designated as accessible. 

Trione-Annadel State Park, 6201 Channel Drive, Santa Rosa, CA 95409. Open daily, 8 a.m.-Sunset.

Find more info about parks, things to do, and hotels & lodging in Sonoma County.

Written by Sonoma Insider Suzie Rodriguez. Updated by Patricia Lynn Henley.