Field Trips

CNPS- Yerba Buena Natural History Walks:

We have a bountiful bevy of entertaining and informative walks coming in 2018!

All are welcome (some trips you need to register for but most you don't). We're out there...get out there with us!


Sunday, SEPTEMBER 9, 10AM - noon

FIELD TRIP -Presidio Coastal Bluffs

Leader: Michael Chasse'

The Presidio's coastal bluffs are one of the largest natural areas in San Francisco. Its serpentine soils host several rare and endangered plants, including two extremely rare manzanitas: the Raven's manzanita (Arctostaphylos montana ssp. ravenii) and the Franciscan manzanita (Arctostaphylos franciscana). This hike will explore the Presidio's serpentine bluffs, with a focus on recent efforts to restore rare vegetation communities.

We will meet at the Langdon Ct. Parking Lot. Expect a moderately strenuous 2-hour hike, which will follow the Batteries-to-Bluffs trail southward and loop back to Langdon Ct. along the Coastal Trail.

The hike will be led by Michael Chasse, a biologist for the National Park Service. Michael has been involved with ecological restoration in San Francisco for over 20 years and currently coordinatesnatural areas stewardship and rare plant monitoring for the Golden Gate National Recreation Area.

If there are any questions regarding the hike please contact Hannah at


Saturday, OCTOBER 20,  10am to 1pm

FIELD TRIP - San Bruno Mountain: Dairy Ravine-Cable Ravine

Leader: Doug Allshouse

These two north-facing ravines form most of the area above the parking lot opposite the park entrance. Their names allude to dairy ranching and to cables that descend from the communication towers on the summit. The two ravines share similar plant communities that are dotted with eucalyptus plantings threatening endangered butterfly habitat. To explore both ravines we’ll walk the Eucalyptus Loop to the Dairy Ravine and Summit Trails ascending to the mountain’s summit. Then it’s on to Kamchatka Point to see four species in Ericaceae, the Heather family featuring three species that are endemic to San Bruno Mountain. The first two are San Bruno Mountain manzanita (Arctostaphylos imbricata) and a pretty form of bearberry manzanita (A. uva-ursi forma suborbiculata). We’ll see California huckleberry (Vaccinium ovatum), and a pending new endemic species.

There is a $6 entry fee payable at the pay station. Meet at the parking lot on the other side of Guadalupe Canyon Parkway. Turn right at the stop sign just past the kiosk and follow the road under the parkway.

Due to the marine influence the mountain offers box-of-chocolates weather so bring layers. Heavy rain cancels.

Contact Doug at, call or text 415-269-9967 if you have questions.