Field Trips

CNPS- Yerba Buena Natural History Walks:

Please note: Statewide CNPS is requiring signed waivers from event participants.

When noted, field trips require participants to sign online or paper waivers

And special thanks to our dedicated field trip leaders!

Upcoming Field Trips 2024


April 13 & April 20th, Saturdays, 10 AM -12:30 PM 

Delight in the Wildflowers of Mount Davidson! 

Leaders: Jake Sigg and Ruth Gravanis 

In the 1880’s, Adolf Sutro imposed a tree plantation on the wildflower fields on Mt Davidson, among other places.  For some reason—perhaps a property line—he stopped abruptly, so the eastern half of the mountain is grassland, and some of the native grassland species have survived so far, with the energetic help of the RecPark Natural Resources Division, and we will delight in these survivors, which are going berserk with all the rain.  We’ll see all these when we circumnavigate the mountain.

 This will be a moderately challenging hike, entirely on trail, which has a couple of rough spots .  We’re circumambulating the mountain, so after the initial gentle climb will be essentially near level, a mile/mile and a half. We are likely to see blue dips, checkerbloom, sticky monkey, yellow violets, shooting stars, barberry and many more.  

Trip will be limited to ten people because we are confined to a single-track trail.  To reserve your space, please email Jake Sigg and he will notify you of the meeting place.  

Participants should sign this waiver


April 13, SATURDAY 10am- 2pm

San Bruno Mountain: Summit Trail

Leader: Doug Allshouse

The Summit Trail is a very popular and spectacular 3-mile loop that stretches over the northern portion of the Mountain and is the most species-rich trail. It passes through a logged eucalyptus forest and descends past active seeps until it reaches April Brook. We’ll see horsetails, fringe cups, iris, coast rock cress, a club-rush, and at least five ferns. From there we head up to Bitter Cherry Ridge with rocky outcrops covered with fog lichens and views of the ocean and the Colma Canyon dunes.

If we have time, we’ll descend to the parking lot through Cable Ravine. Otherwise, we’ll bail out at Battery Road 59 and descend Radio Road. There is a $6 entrance fee (cash, credit/debit card) payable at the pay station. Bring a lunch and layers of clothing because, due to the marine influence, you never know what to expect. This field trip will be limited to 15 persons. Heavy rain cancels.

Contact Doug at to sign up and get meeting instructions.

Participants should sign this waiver


APRIL 28TH, 2024 SUNDAY 1-3pm

Urban Natives in the Bernal Cut

Leader: Sophie Constantinou

Come explore the hidden treasure trove of urban open spaces filled with natives and a super bloom this Spring. We will travel along the Bernal Cut. Skirting along Arlington Street to San Jose Ave we will see both the impact of transportation on the landscape and the local efforts to build a corridor of biodiversity. Habitat stops along the Natick Triangle sanctuary, the Arlington Path and its hidden seeps, the bridges of Richland and Highland Aves, two murals with San Francisco history and the Bernal Cut path. Support citizen stewardship and the native nurturing that is transforming the most unexpected corners of the city while testing your plant identification and local history knowledge.

Meet up at the Glen Park BART station where there is ample bike and car parking on Bosworth and street parking is free on Sundays. Sign this waiver in advance