Mount Diablo State Park

Call Directions Website

Mount Diablo State Park An Island of Wilderness surrounded by a Sea of Suburbia. Mount Diablo State Park is a unit of the California State Park System. It was established in 1921.

The park encompasses over 20,000 acres. The summit of Mount Diablo has an elevation of 3,849 feet -- it is the highest point in Contra Costa County. Recreational opportunities include camping, picnicking, hiking, bicycling, horseback riding, and rock climbing. The park also serves as a natural and cultural preserve. There are two main entrances into the park: North Gate Road (Walnut Creek side) and South Gate Road (Danville side). The two roads meet at the Junction Ranger Station. Summit Road continues to the very top. The Summit Building, a Civilian Conservation Corps structure, contains a visitor center, open daily from 10AM to 4PM. The park is open from 8AM to sunset.

TRAIL OPENLower Summit Trail will reopen Saturday morning (October 17). 🚶🚴 Thank you for your patience during Lower Sum...
10/17/2026

TRAIL OPEN

Lower Summit Trail will reopen Saturday morning (October 17).

🚶🚴 Thank you for your patience during Lower Summit Trail's closure for trail work which included rebuilding a small bridge that crosses a drainage.

TRAIL CLOSURE⚠ Lower Summit Trail is temporarily closed due to trail work in progress. We are working to reopen the trai...
10/15/2026

TRAIL CLOSURE

⚠ Lower Summit Trail is temporarily closed due to trail work in progress. We are working to reopen the trail as soon as possible. We will post notification here when the trail reopens.

We apologize for any inconvenience and thank you for your patience.

That was refreshing! This buck is licking his lips after a long drink of water. As the heat wave drags on, we should all...
10/07/2026

That was refreshing! This buck is licking his lips after a long drink of water. As the heat wave drags on, we should all follow his example and stay hydrated.

With heat advisories through Thursday (making it six days of scorching temperatures🌡) here are some things to remember while hiking and biking the slopes of Mount Diablo State Park on hot days:

💧 Bring plenty of water!

✏️ Plan your route ahead of time, and let someone know where you’ll be.

😳 Know your limits! If you aren’t feeling well because of the heat, consider finishing the hike or ride another day. The mountain will always be here for you to conquer.

🚶‍♀️🚵🏼‍♂️ Hike or cycle in the morning and evening when it's not the peak of the heat.

Be safe and have fun as we head into Fall!🌞

09/19/2026

Whether on foot, bicycle or horseback, visitors love Mount Diablo’s many miles of trails. For the next two months, Rangers will be making an extra effort to promote trail safety. Visitors may notice increased ranger presence on the park’s trail system as they conduct focused trail patrols aimed at promoting safe and responsible trail use. These patrols are intended to help protect park resources and ensure that all users can enjoy the trails as intended.

Areas of focus for trail patrols may include unauthorized trail use, traveling off established trails, resource damage, wildlife harassment, littering, and any other activities that negatively impact visitor safety and park resources.

Do you know the rules of the trail? We encourage all visitors to familiarize themselves with park rules and to help preserve this special place by staying on designated trails, following trail-use restrictions, respecting wildlife, packing out litter, and recreating responsibly.

Mount Diablo State Park is committed to providing a safe and enjoyable experience for all visitors while protecting the park’s natural and cultural resources.

Whether you’re hiking, biking, horseback riding, or simply enjoying Mount Diablo’s scenic beauty, your cooperation helps ensure the trail system and park resources remain protected for future generations.

Did you know you can make a contribution to science while you enjoy your visit 🚶‍♀️🚴‍♀️ to the park? All you need to do ...
09/12/2026

Did you know you can make a contribution to science while you enjoy your visit 🚶‍♀️🚴‍♀️ to the park? All you need to do is get out your phone 🤳or camera 📷 and take a photo of any living thing ... plant or animal ... and upload it to the free iNaturalist app.

Anything you upload this weekend (Sept 12-13) will count toward our 2026 Bioblitz. These are the last two days to see how many species we can record!

Finding things that are unusual 🦨🌼🐍🦌 is great, but everything counts so taking pictures of the things that seem common 🐝🌳🌿 is important too. All of your contributions help document the rich diversity of life on Mount Diablo.

Fun fact: CA is a hotspot... 32% of all in the U.S. can be found here! 🌿🌱🌸 Ten percent of the state's 6,500 plant species can be found right here on Mount Diablo!

09/10/2026

Need a nature break? If you didn't get a chance to visit the park over the holiday weekend, enjoy this glimpse of the view from the Mary Bowerman Trail on Saturday.

It's time for a bioblitz! Join the effort to document the amazing diversity of Mount Diablo State Park during our weeklo...
09/04/2026

It's time for a bioblitz! Join the effort to document the amazing diversity of Mount Diablo State Park during our weeklong celebration of .

Choose your trail or trails and go out bioblitzing (collecting pictures of living things 🦝🌻🦉🌳) anytime the park is open during the week of Sept. 5 -13.

If you upload your observations to iNaturalist (a free app), they will help you identify what you discovered, and it will automatically be added to the California Biodiversity Week project for the park.

Deer, squirrels, birds, butterflies, dragonflies, lizards, snakes, spiders, trees, lichen, flowers, and more are here...what will you see? How many species can we find in one week? 🦋🐍🌿🌼🦌

Address

Clayton, CA

Telephone

+19258372525

Website

,

Alerts

Be the first to know and let us send you an email when Mount Diablo State Park posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Shortcuts

Share

Category