Weather & Seasons
Sugarloaf Ridge State Park has hot, dry summers and wet, cool winters. State Parks says summer days are often in the 90s, cooling into the 40s at night, while winter brings 30 to 40 inches of rain between November and April, daytime highs in the 50s and 60s and lows that can dip into the 20s. Spring and fall are mild. For today's conditions, the park operator links live weather stations at the Visitor Center (1,200 feet) and on Red Mountain (2,500 feet).
Weather at a Glance
Checking Today's Weather
The operator's Park Conditions page links to a weather page with two stations inside the park: one at the Visitor Center at about 1,200 feet and one high on Red Mountain at about 2,500 feet. The same Conditions page lists trail status, temporary closures and wildflower reports.
State Parks describes the weather here as changeable and recommends layered clothing.
Season by Season
Winter (December to February)
The wettest stretch of the year. Expect daytime highs in the 50s and 60s and nights that can drop into the 20s. Rain feeds the waterfall, and creek crossings on the Gray Pine and Hillside trails can run high. After storms, ask staff at the Visitor Center or kiosk about temporary trail closures.
Spring (March to May)
Mild, green and the main wildflower season, with poppies, buttercups, shooting stars and trillium on the hillsides. The falls may still be flowing early in the season. Weekends get busy and the campground books up from April.
Summer (June to August)
Hot and dry, often in the 90s by afternoon, then cooling to the 40s after dark. Most trails are largely in the sun, so hike early, wear a hat and bring plenty of water; State Parks' brochure gives the same advice. Sonoma Creek often dries up by late summer.
Fall (September to November)
Mild days return. The rains usually begin by November. The park stays open, and the campground is open year-round (camping).
Fire Season
The park becomes very dry in summer and fall. State Parks' brochure asks visitors to smoke only in developed areas and never on trails, and fires are allowed only in the fire rings provided. State Parks and the operator also carry out prescribed burns and brush-pile burns, and the operator notes that pile burns can cause temporary closures, posted on its Conditions page (about the park).
What to Wear and Bring
- Layers, because a warm afternoon can turn cold at night, especially in the campground and at the observatory.
- A hat and sun protection for open trails like Bald Mountain.
- Water. State Parks' brochure tells hikers to bring drinking water.
Weather & Seasons FAQ
What kind of weather does Sugarloaf Ridge State Park get?
Hot and dry in summer, often in the 90s by day and the 40s at night. Winters are wet and cool, with 30 to 40 inches of rain from November to April and lows that can reach the 20s.
What season is best for Sugarloaf Ridge?
Spring, for wildflowers, mild weather and a flowing waterfall. Fall is also mild. Summer is hot, so hike early.
Where can I check live weather at Sugarloaf Ridge?
The operator's Park Conditions page links to two in-park weather stations, at the Visitor Center (1,200 ft) and on Red Mountain (2,500 ft).
Facts checked against the California State Parks page for Sugarloaf Ridge State Park on October 24, 2026.