Become a Certified California Naturalist


The California Naturalist (CalNat) program, developed by UC Agriculture and Natural Resources, is a science-based certification designed to turn nature enthusiasts into environmental stewards. Through a mix of classroom learning and field experience, you’ll master the ecology, geology, and wildlife of the Berryessa Snow Mountain region and join a statewide network of conservationists. The program is open to all interested adults - no prior science or naturalist experience necessary!


Photo by: Caty Franco

Register Now
California Naturalist Program Logo
UC Environmental Stewards
Tuleyome Logo

About the Program

  • Why Get Certified?

    The California Naturalist (CalNat) program is more than just a class: it’s a gateway to environmental leadership. Since 2018, Tuleyome has trained over 200 naturalists to serve as the "voice" of our local landscapes.

    • Expert Guidance: Learn from a team of scientists and conservationists. 
    • Hands-On Learning: Combine classroom theory with immersive field trips. 
    • Meaningful Impact: Gain the skills to become a docent, writer, or community advocate. 
    • UC Academic Credit: Eligible participants can earn credits through UC Davis Extension. 
  • What You'll Learn

    Our curriculum focuses on the unique ecology of the Berryessa Snow Mountain National Monument region and western Sacramento Valley:

    • Geology & Hydrology: Understand the foundation of our landscapes. 
    • Flora & Fauna: Identify native plants and local wildlife. 
    • Stewardship: Learn participatory science and community service techniques. 
    • Capstone Project: Complete a personal project that contributes to local conservation. 
  • Teaching Modules

    Teaching Modules Include:

    • A “Nature Table” for sharing field journals and photos of specimens found in the region 
    • An overview of textbook chapters, along with more targeted information about our region with a focus on vocabulary 
    • Guest lecturers 
    • Guided field trips 
    • Hands-on learning experiences 
    • And our very popular “Species Identification Modules” during which we will go over various common species found in the region and tell you some fun facts about them
"I highly recommend this course to anyone looking to connect with nature and learn from passionate experts. Each speaker is knowledgeable, enthusiastic, and eager to share with students."
Recent Graduate

Course Options

Next Session: TBA

Schedule: Class meets every Friday, 12 pm to 4 pm. Field trips take place at various locations on Saturdays.


Class Location: 622 Main St, Woodland, CA 95695 - students will be provided specific directions.


Textbook: All students will be expected to purchase the required textbook for the course. You can order the textbook directly from the University of California or through other book outlets.


Standard Registration: $525 plus credit card processing fees (about $16)


NOTE: Once the registration fee has been paid it will NOT be refunded in whole or in part (except in the unlikely event that the entire course is canceled by Tuleyome).

AT WILBUR HOT SPRINGS RESORT


DATES: TBA


Class meets everyday Sunday to Friday. Students stay at the resort as there are many early morning and evening field trips. This course covers the same material as the multi-week program but in a more condensed time frame.


Students will be expected to purchase the required textbook for the course. You can order the textbook directly from the University of California or through other book outlets.


Please contact Nate for registration information.


NOTE: Once the registration fee has been paid it will NOT be refunded in whole or in part (except in the unlikely event that the entire course is canceled by Tuleyome).

Testimonials

I highly recommend this course to anyone looking to connect with nature and learn from passionate experts. Each speaker is knowledgeable, enthusiastic, and eager to share with students.

Tuleyome's CalNat course was a transformative experience for me. Not only did I gain a deeper understanding of the natural world, but I also formed lasting connections with beautiful landscapes in my backyard!

The hands-on field trips and learning opportunities from guided trips to self-guided adventures and intentional projects sparked joy and curiosity within me and others in the course.

The regionally specific presentations about flora and fauna of the Inner Coast Range and Sacramento Valley were specifically quite helpful in fostering discussion.

The instructors were excellent, knowledgeable and inspiring! The class was fun and engaging!

Thank you to the folks at Tuleyome for providing a supportive space for personal growth and development, for people from all walks of life.

RECENT NEWS

By Shai Demus September 10, 2026
 Yosemite National Park belongs to the people. It should not be carved up to benefit a private developer. The National Park Service is working on a new proposal to give up a quarter-mile strip of land inside Yosemite National Park in exchange for property elsewhere in California. What's the goal? To provide a private developer with a new road and direct access from his 83-acre planned real estate development abutting the park to one of Yosemite’s central roads. This proposal deserves the public’s attention. The property is owned by Kingsbarn Realty Capitol, whose CEO wants to build a road connecting the private property to Yosemite. Previous efforts to establish this private access were rejected, including in federal court. The National Park Service has repeatedly refused similar requests for more than two decades. Our National Parks should not be carved up for private profit. National Parks were established in this country to protect America’s most interesting and iconic places for everyone to access, not to provide special access or development opportunities for private interests. Your action is especially timely because the Park Service has acknowledged that no final decision has been made, meaning there is still an opportunity for public scrutiny and opposition. Any eventual land exchange should be subject to federal laws, environmental review, and public notification requirements. Tell the National Park Service: Keep Yosemite public We can’t allow a national park to be reshaped around the interests of a private developer. Yosemite is a national treasure. Its lands, wildlife, cultural resources, and landscapes belong to the American people, and they should remain protected for generations to come. We have seen this kind of proposal before, and the public and the courts rejected it. We must make sure it does not come back through the back door. Yosemite is worth protecting. Speak up and keep it public. TAKE ACTION: Tell Interior Secretary Burgum to Keep Yosemite Public! Here’s How: Call your elected officials. Here is a sample script: “Hi, my name is [NAME] and I'm a constituent from [CITY/ZIP]. I'm calling to urge [Representative/Senator NAME] to publicly oppose the National Park Service's proposed land exchange inside Yosemite National Park, which would give a billionaire private developer, Kingsbarn Realty Capital, new road access through park land. I'm also asking [him/her/them] to call on Interior Secretary Doug Burgum to reject any further privatization or sell-off of our public lands. Yosemite belongs to the public, not private developers. Thank you.” Send a letter or email. You can use this template: Dear [Representative/Senator NAME], I’m writing as your constituent to urge you to oppose the National Park Service’s proposed land exchange inside Yosemite National Park. This proposal would trade a strip of park land to provide Kingsbarn Realty Capital, a billionaire private developer, with new road access from an 83-acre private property to one of Yosemite’s central roads. This is not the first attempt to establish this private access – previous efforts were rejected, including in federal court, and the Park Service has denied similar requests for more than two decades. Our public lands exist to serve the public, not to create development opportunities for billionaires. I ask that you publicly oppose this proposal and call on Interior Secretary Doug Burgum to keep Yosemite, and all our national parks, fully public and protected for future generations. Thank you for representing our community on this issue. Sincerely, [NAME] [ADDRESS/ZIP] Not sure who represents you? Find your U.S. Representative and Senators here .
By Nate Lillge September 10, 2026
I first learned of Tuleyome in 2015 when the Berryessa Snow Mountain National Monument was created and it was in the news. I thought then of what a marvelous and impressive, important effort this was by so many people, including Tuleyome. Importantly it was so inclusive, involving people of so many different backgrounds and interests, getting the buy-in from the community at large. Once I learned about Tuleyome (and the meaning of the name - deep home place) and some of its conservation efforts, I decided that I wanted to contribute, at least in a small way. I come from a farming and research background, and newly retired, wanted to be more involved in conservation efforts and Tuleyome was local and ideal! I think the aspect of Tuleyome’s work that most resonated with me is the focus on educational programs for young people and adults. As an older person, I know that experiences we have in childhood have life-long impacts. Let them be positive and enriching experiences and let them include conservation and the natural world! Young people have many demands on their time and attention and most have limited exposure to nature. Regardless of our career paths, an appreciation of nature is vital for the well-being of us all. As a docent helper this past spring I was touched by three students who said this was the first time they had been out in nature. In 2024 I had the opportunity to participate in the Certified California Naturalist Program (CalNat) and was inspired by the lead instructors Geoff Benn and Nate Lillge, and invited speakers. And, I love the new manual about the Berryessa Snow Mountain National Monument , especially the geology section. My donations can be used toward any need but I particularly want to support the educational efforts for young people. The National monument is a treasure in our backyards. Its creation and subsequent enlargement in 2024, reminded me of the adage “think globally, act locally”. The multi-pronged conservation efforts of Tuleyome and its commitment to a diverse regional community are such important and positive actions. I see Tuleyome as a small but powerful inspiring organization.
By Kristie Ehrhardt September 10, 2026
Public Lands Day is a national one-day party to celebrate the largest volunteer effort to benefit the wellbeing of our public lands. Because it’s so fun though, lots of organizations celebrate all week long with events beginning on Monday, September 21st. There are lots of activities to participate in such as trail building and maintenance (something Tuleyome doesn’t save up for one designated day, with your help we do it all year long!), planting native trees and vegetation, repairing and restoring habitat and structures, endangered species monitoring, cleaning up trash and removing invasive plants and much much more. If you can’t participate in person, there are virtual talks and even hikes that you can join without having to change out of your pajamas. Last year alone there were over 55,000 volunteers at more than 900 events across the country getting dirty with their community to spiff up those public lands that are near and dear to our hearts. The theme for National Public Lands Day (NPLD) this year is “Caring for Our Shared America” and because it is America’s 250th birthday, we think the turnout will be even more Monumental (ahhh, snuck that one in!). National Public Lands Day began in 1994 and occurs annually on the third Saturday in September. The yearly event is organized by the National Environmental Education Foundation (NEEF) in partnership with the National Park Service and other agencies. NEEF is a non-partisan, non-profit organization sanctioned by Congress in 1990 through the National Environmental Education Act. NEEF focuses on improving and maintaining public access to the environment for enrichment in our daily lives. Public Lands include forests, national monuments, wildlife refuges, grasslands, marine sanctuaries, lakes and waterways, city, county and state parks and beyond - spaces managed by public agencies and non-profits that provide places for public recreation and connection to each other and the environment. While planned events focus on improving the environment and opportunities for education, recreation, and the betterment of physical and mental health, a beneficial side effect is the kinship that naturally develops between those coming together for a common purpose. Some interesting events in the Cosumnes River Preserve include invasive plant removal by canoe, maintenance on their fabulous boardwalk and a family-friendly guided nature walk. Visit NEEF's website to find other events throughout the nation. If you’re interested in planning your own National Public Lands Day event, NEEF can help you with that too. To volunteer in your own community, contact local conservation groups, regional, state and federal agencies. National Public Lands day provides an opportunity for all nature lovers from seasoned hikers with callouses and stories to go with them to those just breaking in their first pair of hiking boots, a chance to work side by side to show appreciation for our shared public lands. If you aren’t able to volunteer you can still help better our public lands by following and practicing the Leave No Trace principles while recreating: Plan ahead and prepare Travel and camp on durable surfaces Dispose of waste properly Leave what you find Minimize campfire impacts Respect wildlife Be considerate of others Practicing these ideas minimizes our impact on the environment, wildlife and others. These principles are as important in our local neighborhood parks as they are in our national parks and monuments. Join Tuleyome in celebrating Public Lands and an enduring commitment to conservation - not only on September 26 but everyday. Now, go take a hike!