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CBTA is a non-profit educational association dedicated to the interpretation of human and natural history at Calaveras Big Trees State Park, in cooperation with the California State Park System. All contributions are tax deductible.

Save Our State Parks

The State Park Foundation does a great job of staying on top of current reports with regard to the state park closures. Please visit their site by clicking here for the latest update.

Latest News

Fall Seminars

September 20 - “Going Batty” Presented by Dr. Dave Johnston

Dave is an Associate Wildlife Ecologist at H.T. Harvey & Associates and a board member of the North American Society for Bat Research.  Dave has spent over 20 years investigating impacts to bat populations from post construction wind and solar energy projects, urbanization, and transportation issues. He is the lead author for the California Bat Mitigation Techniques, Solutions, and Effectiveness for the State of California and for many other technical reports and scientific investigations.  Dr. Johnston has on-going bat projects in Hawaii, California, Belize and Mexico.  Shortly after the lecture he will lead us into the field to mist net and to observe bats in the wild.

October 4 Seminar - “Conservation of Native Bees”  Presented by Julie Serences
Julie wants us to appreciate our native bees in their role as pollinators. Native bees are the most important group of pollinators of native plants. Julie is a professional educator with over twenty-five years of experience teaching learners from pre-school to adult.  She is currently on the Xerces staff as a volunteer consultant for Pollinator Conservation.
All Seminars will be held in Jack Knight Hall at Calaveras Big Trees State Park from 10:00 am-12 noon  There is a day-use fee to enter the Park.  The seminars are free and open to the public.  Pack a lunch, bring the family and plan on spending the day among the Giant Sequoias.  For more information call Calaveras Big Trees Association at (209)795-1196 or visit our website at
Please Click Here to download Seminar schedule

Mark Your Calendar

5th Annual Winter Wonderland – Sunday December 28, 2014 – Details coming soon!!

Programs at the Park

Camping -  Please contact Reserve America for reservations at 1-800-444-7275.  Our new dump station is open and operational.

Astronomy Programs - See the stars this summer at Calaveras Big Trees.  Come to the Scenic Overlook:  September 25 – 8 pm.

North Grove Guided Tours - Guided walks of the North Grove are held Saturday at 1 pm.   The walk is 1.5 to 2 hours.  Meet at the New Visitor Center.


Visitor Center Hours


For September

Sunday through Thursday – 10:00 am – 4:00 pm

Friday and Saturday – 9:00 am – 5:00 pm


Join CBTA !

Support from members helps the Calaveras Big Trees Association fulfill its mission of delivering high quality educational and interpretative programs at Calaveras Big Trees State Park.

Since 1974, CBTA has been able to assist in enhancing the visitor’s exploration and enjoyment of Calaveras Big Trees State Park.

Becoming a member of CBTA affords you unique benefits like seminars, workshops, trainings, special events, collaboration and so much more.  Other benefits include a 20% discount (beginning October 1st) in the Visitor Center store and the Big Tree Bulletin published three times a year.

But the greatest benefit of being a member of CBTA is knowing you are contributing to protecting Calaveras Big Trees State Park and helping others gain an understanding, awareness and appreciation of its natural, cultural and recreational resources.

CBTA was established as a 501(c)(3) non-profit corporation in 1974,  Therefore, your membership and contributions are tax deductible to the extent allowable by law.

If you would like to join, please click here to read about the different levels of membership and then to complete the application online or click here to download an application.  Thank you all for all of your support.  We couldn’t do it without you!  Please call the office at 209-795-1196 if you have any questions.

Support CBTA While you Shop

Now you can help Support Calaveras Big Trees Association as you Shop!

We now have several different programs that are easy to join that allow a percentage of your purchases to be directed to Calaveras Big Trees Association


The owners of Sierra Hills Market and Angels Food Market have generously made available the Escrip program to benefit local non-profit organizations through the use of the Escrip Community Card.  When you use of the card, CBTA has the ability to earn up to 5% of monthly purchases when you shop at either market.  How easy is that!  Just show your card or give the clerk your phone number and you help support CBTA.  Once you are enrolled, you can go online and find out about other benefits of the Escrip program.

To sign up simply down load the  form Escrip Form here, fill it out and take it with you the next time you shop at Sierra Hills or Angels Food Markets,  or you may sign up in the store.  Please indicate Calaveras Big Trees Association as your desired beneficiary.  However you choose to do it, it is a painless way to help CBTA continue its efforts to provide outstanding interpretive and educational programs at Calaveras Big Trees State Park.  Thank you for your continued support.  Please call the office with any questions at 209-795-1196.


S.H.A.R.E.S is an acronym for Supporting Humanities, Arts, Recreation, Humanities, Education and Sports and is Save imagesMart’s way of
giving back to the community.  Again, when you present this card at checkout, a percentage of your purchase is directed to CBTA.



If you shop at, you can now support CBTA by shopping at AmazonSmile.  Everything like Amazon Prime works just the same once you are

When first visiting AmazonSmile, you will  prompted to select a charitable organization from almost one million eligible organizations.  For eligible purchases at AmazonSmile, the AmazonSmile Foundation will donate 0.5% of the purchase price to the customer’s selected charitable organization.

Click Here to get started.

Thanks so much for using these ways to help support Calaveras Big Trees Association and the Park.