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