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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

Astronomy Nights Announced

Dave Stanley’s Astronomy Nights:

At the Overlook

May 5th –  8:00 PM start time

June 2nd – 8:30 PM start time

July 7th – 8:30 PM start time

August 4th – 8:00 PM start time

August 11th – (moon night) – 8:00 PM start time

September 1st – 7:30 PM start time

September 29th – 6:30 PM start time

October 27th – (Halloween!!) – 6:30 PM start time

Nancy Muleady Mecham’s Astronomy Nights:

The Night Sky 8:30 p.m.:  At the Overlook  Saturday May 28, 2016 AND

Saturday August 27 at 8:00 p.m.

 Join in learning the stars, constellations, science and lore behind the night sky at Calaveras Big Trees State Park.

Join Dr. Nancy E. Muleady-Mecham for a night of awesome viewing.  Dress warmly.


Special Workshop

Sunday, May 22, 2016            1:30 pm – 3:30 pm   Jack Knight Hall

“Lyme and Tick-Borne Diseases – a Growing Problem in the Western U.S. and What You Need to Know

Presented by Jo Ellis, Director of Education Outreach at the Bay Area Lyme Foundation

Please join us to learn about this important topic.  Some of the areas to be covered are:

  • What is Lyme – overview of the infectious disease, transmission, symptoms, challenges
  • Ticks and Lyme – how ticks get infected and become a vector for the disease
  • How to protect yourself – recommendations and protocols for your facility
  • What to do – if someone is bitten or you suspect has been bitten
  • Other tick-borne diseases – coinfections relative to Lyme and ticks
  • What we know about treating Lyme – latest statistics and data
  • Issues in the field of Lyme disease around diagnostics and treatment

This program is relevant for naturalists, outdoor educators and teachers, park rangers, outdoor sport and recreation instructors, docents, EMTs, first aid providers, firefighters, volunteers and anyone who is working in a position of responsibility for the health and safety of themselves and others while working outdoors.

Workshop is free                      $10 entrance fee into Park

2016 Spring Seminars


May 21            “Roosevelt’s Tree Army”  Presented by Sharon Giacomazzi



May 28 “Dragonflies”  Presented by Kathy Biggs

The talk will probably be followed by a short walk to look for dragonflies in the park.

Kathy worked as an educator in her hometown of Sebastopol, CA in the Gravenstein School district for 18 years before becoming an author/publisher/dragonfly/wildlife pond spokesperson.   Kathy’s love of dragonflies led her to become the author of California’s first dragonfly guide, published in 2000, Common Dragonflies of California. It sold out at over 14,000 copies and the new revision and complete update of this guide is now available – published May 2009.

June 4      “California’s Golden Geology ”   Presented by Nancy Muleady Mecham

The geology of California with a special look at the Mother Lode and gold mining.  Join Doc Nancy for an in-depth look at the fascinating element, gold.  What are its unique properties, what is the geology behind the Mother Lode Story, and how did we get our hands on it throughout time.  Doc Nancy is an Adjunct Professor of Biology at Northern Arizona University as well as a Visiting Lecturer for the University of Virginia Semester At Sea Program where she taught biology around the world.  She also teaches part time at Columbia College.  She was selected by the United States as a Fulbright Scholar and traveled to the Russian Federation teach at Gorno-Altaisk State University in southwest Siberia and to conduct research in remote protected areas.

Nancy is a retired United States National Park Ranger and lives in the Sierra Nevada with her family.  When not working on her research on Giant Sequoias she loves to backpack.  She has completed solo hikes of the John Muir and High Sierra Trails through the Sierra Nevada, hiked through the Alps on The Haute Route from Chamonix to Zermatt, and is a Pacific Crest Trail section hiker.  She is the author of several books.

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


May in the Park

Visitor Center

May 1 – May 6 – Daily     10:00 am – 4:00 pm

Beginning in May 7 through May 26, the Visitor Center will be open:

Monday – Friday – 10:00 am – 4:00 pm

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

Beginning Friday, May 27 – Monday September 5 the Visitor Center will be open:

Sunday – Thursday – 9:00 am – 5:00 pm

Friday and Saturday – 9:00 – 6:00 pm



Camping –  

North Grove Campground –  We are now on reservation.  Please click here to make reservations.

Rental Cabins are available.  Click Here for more information

Oak Hollow Campground – Closed  – Scheduled to open mid-May.  Please click here to make reservations.

The Dump Station – Scheduled to open about April 15

North Grove Guided Tours – Guided walks of the North Grove are held on Saturday at 1 pm.   The walk is 1.5 to 2 hours.  Meet in front of the Visitor Center.  Bring water and your comfortable shoes.




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 your 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.

S.H.A.R.E.S.  is changing

Starting on April 1, Save Mart S.H.A.R.E.S. will become Shares powered by eScrip.  Your exisiting SHARES card will no longer be accepted at Lucky, Save Mart or FoodMaxx stores.

If you already are registered with eScrip (which you are if you have the eScrip Community Card used at Sierra Hills or Angels Food Market, you need only register your phone number by clicking here.

If you are new to eScrip, please click here and follow the instructions to register.  Please choose Calaveras Big Trees Association as the non-profit you wish to support.

S.H.A.R.E.S is an acronym for Supporting Humanities, Arts, Recreation,  Education and Sports and is Save Mart’s way of giving back to the community.  By using the Shares program, you can contribute up to 3% of your qualified purchases at Lucky, Save Mart or FoodMaxx stores.

Please call the office at 209-795-1196 if you have any questions or problems.


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  be 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.

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.