Museum
Mount Diablo State Park Summit Museum
Contra Costa County
Daily 10 am to 4 pm
Checked September 16, 2026
View →1 attraction
Things to do in Contra Costa County
1 place to go in Contra Costa County, California. 1 of them publish a price.
Museums in Contra Costa County1
Free in Contra Costa County
One attraction in Contra Costa County gets you in for nothing, in the venue’s own words.
Mount Diablo State Park Summit Museum
The venue says: “Admission to the museum is free.”
What this list covers
Contra Costa County has 1 place to go: Mount Diablo State Park Summit Museum.
1 of them publish an admission price, 1 publishes opening hours.
Every figure here was read on the attraction’s own website, most recently on September 16, 2026.
Common questions
- Is there anything free to do in Contra Costa County?
- 1 attraction in Contra Costa County says on its own website that admission is free. We only say free when the venue does, unqualified — a child rate priced at nothing is not a free attraction. Examples include Mount Diablo State Park Summit Museum.
- What kinds of attractions are included?
- museums (1).