Big Rock Ridge
Source: Marin County Parks
Lucas Valley Preserve
Tuesday, September 23, 2025, 10am – 2pm
This walk will take us from Lucas Valley up Big Rock Ridge, the second highest peak in the county after Mount Tamalpais. This is a long walk but most of it isn't particularly steep as it climbs through open grassland, oak woodland, and chaparral. The views along the way are excellent; we may or may not make it to the summit, but if we do the panorama is breathtaking. Total miles: 6.5 miles. Elevation change: 1050'. Remember to bring lunch, and binoculars if you have them. No pets are allowed, except for service/companion animals. Adverse weather or poor air quality may cancel. Registration is required.
Questions: Contact Shannon Burke
Directions: Meet at the Big Rock trailhead in San Rafael. From Hwy 101 in San Rafael, take the exit for Lucas Valley Rd west approximately 5.5 miles (look for the big rock). Parking is on the south side of Lucas Valley Rd. Do not turn around at the top of the hill. Continue past the top of the hill and turn around in the large driveway on the right.
Sponsor: Parks
Accommodation Information: If you are a person with a disability and require an accommodation to participate in a County program, service, or activity, requests may be made by calling 415-473-4381 (Voice), Dial 711 for CA Relay, or by submitting a Disability Accommodation Request at least five business days in advance of the event. We will do our best to fulfill requests received with less than five business days’ notice. Copies of documents are available in alternative formats upon request.
Tuesday, September 23, 2025, 10am – 2pm
This walk will take us from Lucas Valley up Big Rock Ridge, the second highest peak in the county after Mount Tamalpais. This is a long walk but most of it isn't particularly steep as it climbs through open grassland, oak woodland, and chaparral. The views along the way are excellent; we may or may not make it to the summit, but if we do the panorama is breathtaking. Total miles: 6.5 miles. Elevation change: 1050'. Remember to bring lunch, and binoculars if you have them. No pets are allowed, except for service/companion animals. Adverse weather or poor air quality may cancel. Registration is required.
Questions: Contact Shannon Burke
Directions: Meet at the Big Rock trailhead in San Rafael. From Hwy 101 in San Rafael, take the exit for Lucas Valley Rd west approximately 5.5 miles (look for the big rock). Parking is on the south side of Lucas Valley Rd. Do not turn around at the top of the hill. Continue past the top of the hill and turn around in the large driveway on the right.
Sponsor: Parks
Accommodation Information: If you are a person with a disability and require an accommodation to participate in a County program, service, or activity, requests may be made by calling 415-473-4381 (Voice), Dial 711 for CA Relay, or by submitting a Disability Accommodation Request at least five business days in advance of the event. We will do our best to fulfill requests received with less than five business days’ notice. Copies of documents are available in alternative formats upon request.