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Coming Events

(Observatory is open to the public
ONLY for scheduled events).

Star Party

Saturday, May 20

Solar: 11am-3pm
Star Party begins 8 pm


Night Sky Classes


May 22, Jun. 19, Jun. 26,
Jul. 17, Jul. 24, Aug. 14

Learn about the seasonal sky, with telescope
observing after class. Details

What's Up?
A ticketed star party limited to 50 visitors.

May 25, 7pm

JUPITER will be our main focus. It is undergoing a relatively rare double-shadow event: the moons Io and Europa cross in front of Jupiter, and you'll be able to see their shadows cast upon Jupiter's face.

Other highlighted objects will include the Whirlpool Galaxy, currently colliding with another galaxy, other beautiful galaxies in the Coma-Leo-Virgo cluster and
Ursa Major, and astounding globular clusters in
Coma Berenices and Hercules.

Brown Paper Tickets

$15 General, $10 Senior (62+) and Youth (under 18)

Want to help us keep our doors open?


RFO at night

Above: The Observatory at night. Photo by Mark Hillestad
Top right photo of Refractor Telescope by Jerry Telfer


Rent an

Yes, you can!
Treat your family, friends,
or group of up to 50 people
to a night with the stars!


Weather Forecast

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Sugarloaf Ridge
State Park

"Team Sugarloaf" operates Sugarloaf Ridge,
including the campground. Five nonprofit organizations formed a unique partnership that has worked tirelessly to keep our park open.  

Partners are: Sonoma Ecology Center; United Camps, Conferences and Retreats; Valley of the Moon Natural History Association; Sonoma County Trails Council; and Valley of the Moon Observatory Association.  

With expertise in campground operations, ecological restoration, astronomy, trails management, and volunteer recruiting and training, Team Sugarloaf is creating new opportunities for Sugarloaf Ridge and its visitors.  Visit sugarloafpark.org for more information.

Come to stargaze and camp at Sugarloaf Ridge!