Muir Woods National Monument - General Park Information

Muir Woods National Monument is a unit of the National Park Service in Marin County, California, 12 miles (19 km) north of San Francisco. It protects 554 acres (2.24 km²) of forested area populated by Coast Redwood (Sequoia sempervirens), one of the last remaining stands in the immediate San Francisco Bay Area.

Ecosystem
The Monument is an old-growth coastal redwood forest. Due to its proximity to the Pacific Ocean, the forest is regularly shrouded in coastal fogs, contributing to a wet environment that encourages vigorous plant growth. The fog is also vital for the growth of the redwoods as they use moisture from the fog during the dry summer months.

Climate
The Monument is cool and moist year round with average daytime temperatures between 40 and 70 degrees Fahrenheit (4 to 21 °C). Rainfall is heavy during the winter and summers are almost completely dry with the exception of fog drip caused by the fog passing through the trees.

The park is open from 8 am to sunset, including holidays.
Approximate closing times for the year: Last Sunday of January, park closes at 6 pm; 2nd Sunday of March, park closes at 7 pm; 1st Sunday of April, park closes at 8 pm; 2nd Sunday of September, park closes at 7 pm; Third Sunday of October, park closes at 5 pm.