Sugarloaf Ridge State Park, nestled in the Mayacamas Mountains near Kenwood, California, is a panoramic retreat. Redwood-shaded trails offer a tranquil escape. Cascading waterfalls enhance the beauty of the park. Starlit observatories blend seamlessly in a landscape that feels both wild and welcoming.
What Makes This Park Unique
Sugarloaf Ridge covers nearly 4,000 acres across Sonoma and Napa counties. It celebrates ecological richness with lush woodlands and vibrant wildflowers. The park also features oak-studded meadows, seasonal cascades, and the headwaters of Sonoma Creek. At its high point, Bald Mountain offers sweeping views that reach from the Sierra Nevada to the Pacific. These views frame the park’s natural grandeur. The onsite Robert Ferguson Observatory adds a rare celestial dimension, offering public stargazing beneath crisp dark skies—the largest community-access observatory in Northern California.
Top Activities and Amenities
Hiking, Biking & Equestrian Trails
Over 25 miles of trails traverse diverse terrain—from fern-lined creek valleys and grassy meadows to the summit of Bald Mountain. Trails suit all levels. There are short loops for casual strolls. Moderate hikes like the Vista Trail are available. Challenging paths like the 8-mile Bald Mountain loop offer rewarding panoramas.
Camping, Group Sites & Picnic Areas
The park offers approximately 47 family campsites nestled in a creekside meadow. These campsites are equipped with picnic tables and fire rings. They also have drinking water, restrooms, and coin-operated hot showers. Glamping and accessible sites are available. There is a group campground. It can host up to 50 campers. It includes shared cooking and gathering facilities.
Visitor Center & Interpretive Programs
The visitor center is open most weekends and summer Fridays. It hosts interpretive exhibits and provides free WiFi. There is a gift shop stocked with nature guides and souvenirs. Educational offerings include ranger-led hikes, astronomy programs, moonlit stargazing events, and school field trips emphasizing watershed ecology and park heritage.
Astronomy Programs at Robert Ferguson Observatory
Night skies come alive at the Robert Ferguson Observatory. Public star parties, solar-viewing events, and guided astronomy talks let visitors gaze through multiple telescopes—including the iconic 40-inch reflector. These are scheduled several times each season and often require pre-registration.
Wildlife Viewing & Photography
Spring’s wildflower bloom transforms the park into a vivid tapestry of poppies, lupines, lupine, and more amid verdant hills. Wildlife—from deer and gray foxes to bobcats—stir among the oaks. The waterfall along Sonoma Creek and sweeping views provide endless inspiration for nature photographers.
Practical Visitor Tips
- Day-use fee: $10 per vehicle; annual park passes accepted.
- Campground reservations recommended—especially for glamping or accessible sites; available via ReserveCalifornia.
- Robert Ferguson Observatory programs require a separate fee and pre-registration; check schedule in advance.
- Dogs are allowed only in campgrounds and parking areas; prohibited on trails and in natural areas.
- Layered clothing is advised—temperatures fluctuate in shade and at elevation.
- Protect flora and wildlife: collecting plants or disturbing animals is prohibited.
- Summer evenings are ideal for stargazing—clear skies and cooler air enhance the experience.
Local insight: Visit in spring to see Sonoma Creek’s 25-foot waterfall in full flow. It stands against a backdrop of wildflower meadows. You will also enjoy the fresh greenery. Plan your hike to Bald Mountain near sunset. This timing offers panoramic views that stretch from the Sierra to the Bay. The vistas are spectacular under the soft evening light. Cap your day with a stargazing session at Ferguson Observatory—where constellations and planets roll into the night, illuminated by docent-led discovery. Sugarloaf Ridge offers lush tranquility above the valleys and a rush of wonder skyward—perfect for both grounding and starry-eyed exploration.