Outdoor adventure
$30median per child
15 published prices · United States
$0$90
Middle half: $15.85–$52.50 per child
0 local prices; at least 5 are needed. So this shows the nationwide range.
Outdoor adventure
Birthday score3/5
How we rateMount Diablo State Park is an outdoor option to consider for a birthday outing in Clayton, California. Before inviting a group, decide what activities would suit the children's ages and how long you want the visit to last. Contact the park to discuss your plan, including any group use requirements. Choose an arrival time that leaves room for the outing and getting everyone ready to leave before the gates close.
How does the price compare?
Outdoor adventure: price range from published packages.
Prices from venues in San Jose Sunnyvale Santa Clara CA.
This venue: Ask the venue for a price
No reliably comparable price per child. The bar shows the other venues only, not a price for this one.
Middle half (p25–p75)Median
Starting prices per child; party prices are only divided when the package states how many kids it includes. Minimum spends and unclear prices are left out. Prices in the directory are not live offers. The venue's current price applies.
- Address
- 96 Mitchell Canyon Road, Clayton, CA 94517
- Phone
- 925-837-6129
Our take
3/5Mount Diablo State Park is a reasonable birthday outing for a child who would choose time outdoors with friends. Treat the visit as a parent-planned park trip, with the day's activities chosen around the children attending. A smaller invitation list may make it easier to keep the outing comfortable for everyone.
Timing needs attention: the gates open at 8 a.m. and close at sunset. Plan your arrival and departure around that daylight window, leaving room for the group to move at its own pace. Arrange any separate birthday meal around the park visit and your travel time.
Questions to ask Mount Diablo State Park before booking
These eight points decide whether a party works out and what it really costs. It is easiest to go through them in one phone call.
- How many children fit per party, and when does the price go up?
- Is the room private to our group or shared with other guests?
- How long is the package, and when does the clock start?
- Is a host or activity leader included, or do the parents supervise?
- Can we bring our own cake, drinks or food?
- What costs extra: decorations, food, socks, additional adults?
- Until when can we cancel or reschedule for free?
- Is there space for gifts, coats and the parents' waiting time?
FAQ
What time do the park gates open?
The gates open at 8 a.m.
When do the gates close?
The gates close at sunset. Plan your departure around sunset on the date of your visit.
More places in Clayton
Prices, hours and packages last checked on Oct 21, 2026. Information is provided without guarantee. Please confirm details with the venue before booking.
Is something wrong or out of date? Report a correction.