Event

Public Astronomy Program 

Sunset to Moonrise 

Arrive by 7:00 to safely view the Sun through telescopes. Then enjoy the 7:40 pm sunset and coming darkness, topped off with the rising of the almost full moon at 8:20 pm.


 

Date: Saturday, August 29, 2026

Time: 7 p.m. - 11 p.m. Pacific

Location: Mount Diablo - Lower Summit Parking Lot
Summit Rd
Clayton, CA 94517

Information for Visitors

Location Details

Mount Diablo - Lower Summit Parking Lot

Lower Summit Parking Lot off Summit Road - almost to the top of Mount Diablo

Notes:

Click here for the full schedule of Public Astronomy Nights.

The park gates close around sunset, so be certain to arrive in plenty of time.
The temperature on the mountain can drop considerably during the evening, so dress warmly. Keep in mind that this is a state park and, as such, park rules apply, including any gate fees.

Two or three times during the session, visitors will be escorted off the mountain in groups. Departure will be by way of the North Gate (this becomes Oak Grove Road in Walnut Creek once you are outside the confines of the park.)

Events are only canceled due to rain or fire hazard. Don't be put off by somewhat overcast skies. Often, when it is overcast in the late afternoon, by the time night arrives on the mountain viewing is fine.

If you would like advice on current conditions, you can usually reach a person in the South Gate kiosk until sunset at (925) 837-0904. For more information, call the Mt. Diablo "Hotline": (925) 837-2525

UPCOMING EVENTS

Thu 6/11/2026
11 a.m. - 1 p.m. Pacific
Concord Library Exploration Stations Concord Library
2900 Salvio
Concord, CA
Tue 6/16/2026
11 a.m. - 1 p.m. Pacific
Pleasant Hill Library Exploration Stations Pleasant Hill Library
2 Monticello Ave
Pleasant Hill, CA
Sat 6/20/2026
8 p.m. - 11 p.m. Pacific
Public Astronomy Program: The Moon - Earth's Lost Rock! Mount Diablo - Lower Summit Parking Lot
Summit Rd
Clayton, CA
Tue 6/23/2026
7:15 p.m. - 9 p.m. Pacific
General Meeting Lindsay Wildlife Experience
1931 First Avenue
Walnut Creek, CA