Memberships and Donations

Sugarloaf Ridge State Park is operated by Sonoma Ecology Center, a nonprofit organization under section 501(c)(3). Federal EIN #94-3136500. Sugarloaf Ridge State Park does not receive state funding and depends on visitor and membership fees to operate.

Become a Member or make a contribution to show your support for Sugarloaf!

Together we are the caretakers of this incredible Sonoma County gem. Your membership fees or donation provides the funding needed to ensure Sugarloaf Ridge State Park can flourish today, tomorrow and well into the future!


Membership fees over $100 are tax-deductible.

Annual Pass – $49

Oak Membership – $100

Big Leaf Maple Membership – $250

Sequoia Membership – $500

Total Amount: $0.00

Annual Pass

Buy a Sugarloaf Annual Pass and enjoy the benefits of Sonoma County’s natural beauty all year long! At only $49 the Annual Pass is a great value and it is valid for a passenger vehicle or motorcycle entry at Sugarloaf Ridge State Park and Jack London State Park.

The pass is not valid for camping, extra vehicle fees, other supplemental fees. Park admittance is subject to available space. No commercial use. Also, pass holders get $10 off non-reservation camping during off-peak times.

We will mail your pass and until you receive it, you may use your email receipt as proof of purchase.


Become a part of the special people who are Sugarloaf Members.

Oak Membership – $100

Receive an Annual Pass plus 50% off organized hikes (Excluding Fireworks Hike, Brunch on Bald, and Headwaters to Headwaters Hike)

Big Leaf Maple Membership – $250

Oak level benefits plus free 2-night Glamping Package which includes a campsite, free tent rental, and tent set up
(Choice of 4 or 6 person Marmot tent) and a S’mores kit (firewood and all the S’mores fixings).
Note: Glamping package available Sunday – Thursday nights during busy season and any day of the week Nov. – Feb. Holidays excluded.

Sequoia Membership – $500

Big Leaf Maple level benefits plus an invitation to a special appreciation event.

NOTE: You may use your email receipt to get into the park until your annual pass arrives in the mail.

Camp Butler Sunset


Sustaining your park requires a team effort and donations support park operations, including projects to maintain Sugarloaf’s beauty, accessibility, and park amenities.


Where the need is greatest

We will use your generous donation to address any immediate items requiring attention.

North Bay Black Bear Collaborative

Since 2015, Sonoma County has seen an increase in reports and sightings of black bears (Ursus americanus). Sightings of these large charismatic mega-fauna elicits feelings of excitement, curiosity, fear, and wonder. Many questions arise as well; why are we seeing a rise in bears? Are we even experiencing a rise in bears, or do we just have more wildlife cameras? Where are the bears coming from? And perhaps most importantly how can we build a community that keeps both the bears and the humans safe?  For nearly 100 years, Sonoma County has lived virtually bear free since the eradication of the California grizzly (Ursus arctos californicus) in the early 1920’s. But it is helpful to remember that California, including Sonoma Co unty, was once home to what was thought to be the densest population of grizzly bears on the North American continent. At least 10,000 grizzlies, at any given time, lived in coastal California. Black bears also lived in

California during this time, but according to the book California
Grizzly by Storer and Tevis, their numbers were sparse in comparison. “There are few early remarks about the scarcity or absence of black bears where grizzlies held sway.” While their habitats rarely overlapped, Sonoma County was one place that hosted both black and grizzly bears. The black bear’s range stretching from Oregon along the coast and south into Bodega, Sonoma County.

But the black bear scarcity of 100 years ago has been steadily changing. Black bear populations have been growing, as if filling in a vacuum left by the demise of grizzlies. California Department of Fish and Wildlife reports that the black bear population in California has expanded to over 30,000 individuals. Southern Humboldt County and Mendocino County now boast the highest density of black bears in the state. So, while there have always been accounts of black bears in Sonoma County, perhaps it is not surprising that there seems to be an escalation of sightings in the past several years. These sightings give rise to many questions:

  • Have these bears always been here, under our radar, or is this a new phenomenon?
  • is this is a new phenomenon, are we seeing an increase in bears due to dispersal behaviors from Mendocino County?
  • Does Sonoma County have a residential and reproducing black bear population?
  • Most importantly is this increase in sightings and bear/human interactions has led to the need for updated and improved black bear public awareness and management.

Help us study the bears and educate the populace to keep the bears wild.

See some videos on our facebook page.  


We have a need for a new ATV so our staff can make trail improvements and more quickly respond to visitor requests for assistance.  Honda of Northern California has generously agreed to give us a discount on a 4-seat Honda Pioneer 700.  (But the price is still $12,500).  Or if you have a used one you want to donate…..

Historical Ecology Research

As a result of the New Year’s Eve Storm of 2005-2006, a paleobotanical discovery was made within Sugarloaf Ridge State Park, on the headwaters of Sonoma Creek. The discovery provides an important perspective on the forests of the Mayacamas Mountains during the Late Pleistocene. Numerous specimens of partially carbonized wood were recovered, eroding from a deeply buried deposit.  

The six pine cones that were found on Sonoma Creek are thought to have significance in a world struggling with a changing climate. Future efforts to better date the six cones and to establish their genetic history are called for.  Please support this effort – costs to date the cones, genetic research and manage the project are approximately $5,000.  More info here: Pine Project Overview

Ecology Research

Your support will be used to deploy, maintain and monitor our very popular ‘critter-cams’.  The cameras have allowed us to track plant and animal recovery from the fires.  Our 16 cameras in this volunteer-led program have provided the best data ever on the creatures that inhabit this wild and wonderful place.  We are seeking funding to support our staff, replace old equipment and hire an intern to perform further analysis.  Donate $250 to sponsor a camera!  We will send you the best photos from your camera.

Animal Research Budget
Item Cost Notes
Equipment $1,500 Replace 1/3 of cameras, plus locks, etc.
Software $200
Staff Time $5,000 manage volunteers, meet with research partners, plan data analysis
Summer Intern $5,000 10-week intern to analyze data and compile findings.
Total $11,700

ParksRx and Outreach  Fitness Programs

The Sonoma Ecology Center/Team Sugarloaf operates one of the SF Bay Area’s most successful and vibrant ParksRx program.  Our events attracting 1000s of attendees per year, the program offers a variety of hikes and programs for different needs.

How you can help

Rather than seeking money and then building a program, Team Sugarloaf built the program we now seek funding to support it.   We need about $15,000 per finance to help the program as it is at Sugarloaf Ridge State Park.  To expand to a multiagency county-wide program would require an additional $30,000.

ParkRx for health program aims to help improve the health and well-being of Sonoma County residents through regular exercise in Sonoma County parks and on Sonoma County trails. By “nature” a collaborative program between health care and park professionals, patients are “prescribed” monthly activities at local parks which introduce participants to safe, low impact walking or outdoor physical activities in nature. Our goal is to promote healthier lifestyles that result from engagement with nature and movement.

At Sugarloaf, attendees that provide a signed prescription from their medical provider receive free admittance to the program.  When a medical provider thinks that getting a patient into the outdoors for physical or mental wellness, we have a program for them.  Each Rx is valid for three months.


This year those age 70 and older may want to consider making a meaningful, tax-efficient gift to Sonoma Ecology Center using funds from their traditional or Roth IRA. With this way of giving you can:

  • Make tax-free gifts each year from your IRA withdrawals by having a portion transferred directly to SEC (up to $100,000 per year for an individual; $200,000 per couple with separate IRAs).
  • Use your Required Minimum Distribution for you gift to avoid taxes on the transfer of funds.
  • Avoid increasing your adjusted gross income and potentially subjecting your Social Security income to a higher level of taxation by giving directly from your IRA.
  • Provide a generous gift to SEC.

Please contact if we can provide more information to you or your advisors.

How to Donate Stock

Each stock gift we handle strengthens our programmatic work while providing tax benefits for supporters.

Here are step-by-step instructions to help you take advantage of this gift planning opportunity:

Give your broker the following information to transfer a gift of stock to the Sonoma Ecology Center:

  1. The Sonoma Ecology Center’s brokerage account is with Charles Schwab Co. Inc.
  2. The Sonoma Ecology Center’s account number is 5655-2785.

Either you or your broker must contact us via email at or call 707-996-0712 ext. 103 with the name of the stock and the number of shares being transferred. This ensures the gift is properly credited and acknowledged.

When SEC receives a stock gift, our policy is to sell the stock as near as possible to the date of the gift.

If you have questions or if we can assist you in making a gift of stock, please contact