Welcome to the Mt. Tamalpais Interpretive Association (MTIA), a cooperative organization run wholly by volunteers to help you enjoy Mt Tamalpais State Park, just north of San Francisco. 

For more background on the park, visit the state park website.

The MTIA offers:

Guided hikes, from easy strolls to rigorous multi-milers as well as moonlight and moonrise hikes.

Astronomy nights May through October, with lectures followed by telescope viewing. Astronomy events take place at the Rock Spring parking area and the Cushing Memorial Amphitheater, more commonly known as the Mountain Theater. 

A Visitor Center at East Peak that is open weekend days, as is the recently opened Gravity Car Barn. Learn about the history, geology, flora, and fauna of Mt. Tam.  You can also get trail advice and find maps and gifts.

You can get to Mt. Tam by public transportation – for the bus schedule, visit the West Marin Stage Coach website or call 415.526.3236.

Every spring, a professional theater group stages a musical at the Mountain Theater. Thousands of people make the Mountain Play a hike destination and occasion for a picnic with friends and family.

The MTIA is always looking for more Tam enthusiasts to lead hikes, assist at astronomy nights, staff the Visitor Center, staff the Gravity Car Barn, and help maintain the trails.  Please join us!

Check for other information in the FAQ. If you can’t find the answer to your questions there, contact information can be found here.

The site map can be found here.