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Trione-Annadel SP - Burn Bioblitz with 2019 City Nature Challenge

Time: 9 AM Hike Departure to about Noon
Location: Warren Richardson Trailhead Parking Lot (end of Channel Drive)
Trails: Warren Richardson and Two Quarry Trails

RSVP REQUIRED includes lunch:

But you can BioBlitz all weekend on your own too: April 26-29, 2019 iNaturalist project page: Trione-Annadel Bioblitz 2019

Use your smartphone to monitor nature's recovery after the October 2017 Nuns Fire, which burned approximately 60% of Trione-Annadel State Park. Using the iNaturalist app, we will photograph as many living things as we can find in an area that burned. Please be prepared for a moderate hike of up to 4 miles for this event.

Bioblitzes are gatherings of scientists, citizen scientists, land managers, and more, all working together to find and identify as many different species as possible. Bioblitzes not only help land managers build a species list and atlas for their park and provide invaluable data for researchers, they also highlight the incredible biodiversity in these Bay Area oases.

Join California State Park staff, docents and volunteers, as we hike up Warren P. Richardson Trail and Two-Quarry trail.  Total distance may be dependent on how much we stop and photograph (typically 3/4 to 1 and a half miles). We might see wildflowers that only bloom after a fire, or have not bloomed here for many years, or are blooming more profusely as a result of the fire.

Wear hiking shoes, layers appropriate for weather; bring water and a snack. Some trails are rocky and uneven. It is a minimum one-mile hike up Warren-Richardson to the burn area on a moderately sloped dirt fire road. HEAVY RAIN CANCELS. There is a day use fee $7 per car ($6 for seniors). Please pay at STOP sign on Channel Drive. Dogs not allowed. There are restrooms and water at the parking area.

Directions: from Montgomery Drive, turn onto Channel Drive and follow the road in approximately 3/4-mile to the STOP sign. Pay fee or display State Park Pass. Drive 1 mile to the large parking lot. California State Parks supports equal access. Prior to arrival, visitors with disabilities who need assistance should contact Bill Miller at 707-769-5652. 711, TTY, Relay Service

Read more about bioblitzes here:

Please see the Trione-Annadel State Park website for more details about the park (, click “Park Events”)

Trione-Annadel SP

Event Dates