The park is about 65 miles south of San Francisco. From Santa Cruz travel approx 25 miles northwest via Highways 9 and 236 to reach Park Headquarters. Park Headquarters is 9 miles north of the town of Boulder Creek on State Hwy 236. All roads into Big Basin are curvy. The Rancho Del Oso coastal unit of Big Basin is accessible on State Route 1, about 20 miles north of the city of Santa Cruz.
Winter: Cold, overcast and rainy. Big Basin receives the majority of its average 48 inches of rain. December through March average temperatures range from highs in the 50's to lows in the 20'.
Spring: Cool with showers and morning and evening fog. Average daytime highs in the 60's, lows in the 30's to 40's.
Summer: Warm with cool nights. Morning fog in early Summer. Average highs 75 to 95, lows 40's to 50's.
Fall: Warm day to cold nights. Occasional early storms with rain. Average highs 75 to 60's, lows 50's to 30. Maybe the best weather of the year!