About the Program
Join us for an exploration of California's ecology from the rocks to the habitats that thrive in our richly biodiverse state. We'll focus on the ecology of the Coast Ranges, from the geologic formation of our state to the people, plants and animals that rely on our diverse landscape. We include a variety of guest speakers, field excursions, and hands-on activities in our six Saturday classes at the Hopland Research and Extension Center.
The California Naturalist Program promotes environmental literacy and stewardship through discovery and action. To become a certified California Naturalist, enroll in our ~45 hour course with the Hopland Research and Extension Center. Upon completing certification requirements, participants are eligible for four academic credits through UC Davis Extension for an additional nominal fee.
Click here to read more about the California Naturalist statewide program.
Class details and Registration
Registration for our Spring 2026 class is open. The class runs across six Saturdays: 2/21, 3/7, 3/21, 4/11, 4/18, 5/2. Each class will include classroom and field time at the UC Hopland Research and Extension Center. Classes will run from 8:30am-4:30pm.
The syllabus covers biogeography, geology, traditional ecological knowledge, hydrology, plants and plant communities, wildlife, water and climate change. This syllabus may be subject to minor changes, registrants will be kept informed of any changes.
DRAFT 2026 California Naturalist class syllabus
Textbook: Assigned readings from the California Naturalist Handbook should be completed before each class where they appear on the syllabus. Buy the class handbook here with a 30% discount code UCPSAVE30. Click buying options and select "UC Press" from the drop-down menu.
Classes will be in the field and the classroom
Classes will be a mix of lecture, discussion, eating and outdoor exploration. Bring your lunch each day, dress appropriately for the weather and wear good walking shoes—you never know when we'll head outside!
We meet at the Hopland Research and Extension Center at 4070 University Road, Hopland. Participants may not bring pets, guests or children on any field trips. Directions will be given upon registration.
In preparation for lectures, all assigned readings from the California Naturalist Handbook should be completed before each class where they appear on the syllabus. Buy the class handbook here with 30% discount code UCPSAVE30. Click buying options and select "UC Press" from the drop-down menu.
Cost
We are committed to building an inclusive community. Our equity pricing allows us to serve the community better and to recover the costs of this class.
Registration is $490 per person (includes certification, instruction, some materials, and facility costs). If you are unable to pay this amount due to low income or extenuating circumstances, please use our income guide and sliding scale to adjust your course cost. Minimum payment is $320.
Donor funds will support the costs of those who are unable to pay the total amount.
To assist you in determining an appropriate payment amount for your circumstances, 2024 Mendocino County U.S. Department of Housing and Urban Development low income indicator data is provided as guidance.
| Mendocino County, CA, Household size | 1 person | 2 person | 3 person | 4-8 person |
| LOW INCOME | $50,650 | $57,850 | $65,100 | $72,300-$95,450 |
Early registration is recommended. This class typically sells out.
Scholarships
A limited number of need-based scholarships are available that will cover up to 50% of the registration costs. Applications for financial aid must be received by January 7. All applicants will receive notification of their scholarship status January 9. Scholarships applicants only need fill out the scholarship question on the application form, no payment is required at this stage.
Instructor - Jennifer Riddell PhD
Jen Riddell is a botanist and ecologist living and working in Mendocino County. She has worked as a professional botanist and biologist for habitat monitoring and restoration projects in California and Oregon for over 20 years. Dr. Riddell lives in Ukiah and has a passion for the rich habitats of our oak woodlands and for the plants and animals that rely on them. She's been teaching the California Naturalist Program in Mendocino County since 2014, and loves sharing her joy in nature and with the curious and dedicated people who sign up for the class.