Looking for a great trail in Mount Diablo State Park, California? AllTrails has 72 great hiking trails, trail running trails, mountain biking trails and more, with hand-curated trail maps and driving directions as well as detailed reviews and photos from hikers, campers, and nature lovers like you. Gearing up for a challenge? There are 37 hard trails in Mount Diablo State Park ranging from 3.6 to 27.6 miles and from 341 to 3,848 feet above sea level. Start checking them out and you'll be out on the trail in no time!

hiking

views

nature trips

bird watching

wild flowers

no dogs

trail running

wildlife

walking

forest

mountain biking

kid friendly

waterfall

horseback riding

camping

At the eastern fringe of the San Francisco Bay Region, Mount Diablo, elevation 3,849 feet, stands alone on the edge of California’s great Central Valley. At this point, the Coast Range consists only of low hills, none high enough to block the view from the upper slopes of the mountain. As a result, the view is one of the best in the bay. Many visitors to Mt. Diablo head straight for the summit to enjoy the famous view from the observation deck area. Summer days are sometimes hazy, and the best viewing is often on the day after a winter storm. Then, you can look to the west, beyond the Golden Gate Bridge, to the Farallon Islands; southeast to the James Lick Observatory on Mount Hamilton at 4,213 feet elevation; south to Mount Loma Prieta in the Santa Cruz Mountains at 3,791 feet elevation; north to Mount Saint Helena in the Coast Range at 4,344 feet, and still farther north to Mount Lassen in the Cascades at 10,466 feet. North and east of Mount Diablo, the San Joaquin and Sacramento Rivers meet to form the twisting waterways of the Delta. To the east beyond California’s great Central Valley, the crest of the Sierra Nevada seems to float in space. With binoculars, you may even be able to pick out Half Dome in Yosemite National Park. Mount Diablo State Park is one of the ecological treasures of the San Francisco Bay Area with entrances in Walnut Creek, Black Hawk, and Danville. Every season in the park has its special qualities. Discover for yourself the mountain's beautiful wildflowers, its extensive trail system, fascinating wildlife and distinctive rock formations. View the stars from its lofty heights, bike ride to its 3,849 foot summit or explore the more remote trails by horseback. The park offers hiking, biking, horseback riding and camping. Dogs must be on a leash under your control at all times. Dogs are not allowed on trails. Dogs must be in a tent, camper or enclosed vehicle during the night. There are plenty of picnic areas as well as camping at Juniper Campground. Road bikers enjoy rides up North Gate or South Gate Road and the descents are just as fun. Mountain biking is also possible on many of the single track trails. Gates open 8am and close at sunset. Visitors should plan on being back at the parking area to be in their vehicles by sunset and headed out to avoid being locked in.

A fun and varied trail. Modest overgrowth in parts. Ticks were a very real issue. My partner and I easily removed 30-40 ticks each in the mile up to and past the peak.

Love this trail. The first half is basically all up-hill. The 7ish mile loop is easily done in 3 hours. I ran down the the last 3 miles so it took me around 2 hours. Started raining on me too so the trails got muddy. Also no dogs on the trail.

Difficult but a good training hike. Parking at Mitchell canyon avoids the neighborhood parking but adds a couple of miles.

Excellent challenging hike to the summit via Mount Olympia. Unusual steady rain on the way down, but kept the crowds away. Good workout!

hiking
over grown
rocky
4 days ago

There's another hike called Mount Olympia Loop. I recommend that one over this out and back. East Trail is steep and slippery with small rocks; better to go up than down. Go down on Mount Olympia Road and Trail. It's longer but safer, less overgrown with vegetation, and less poison oak. Zippe Trail looks interesting and is another option, but looked a bit overgrown so I did not do it. Glad I did this on a cool day. 5/14/19

hiking
over grown
rocky
5 days ago

Nice but difficult hike. Mileage is about 5.5, as the route shown does a double loop. East Trail I think is harder than Olympia trail, and it's steep with small slippery rocks; better to go up than down. Single track trails are a bit overgrown and look out for poison oak. I think next time I'll avoid East Trail and go up and back on Olympia Trail and Mount Olympia Rd. instead; longer but less steep and slippery and less poison oak. Great views on this hike!

The trail has breathtaking views of Mount Diablo and the whole area. We took a left in the first place, going down to the valley. The creek is beautiful and the vegetation exuberant. It seems that this path (going through the valley first) is better and quicker since there is just one big uphill. If we took a right at the beginning (an uphill to the top of the mountain), we would have two big uphills and just one downhill.

hiking
bugs
rocky
5 days ago

hiking
7 days ago

Easy trail that is partly paved with great views and wildflowers. We took our 7 month old, 4 year old and 6 year old and they had a blast. It’s short but so much to see it took us an hour to get around with our kids.

The trail splits early in and we chose to go left first. If doing it again, I’d probably do right first given that the decent in our case was pretty rocky and slid a lot. It had great views of Mount Diablo and the surrounding area. The grasslands on the approach with the oak groves were pretty fantastic. Watch out for poison oak after the grasslands as there is a lot.

The wildflowers are still doing their thing , but so is the poison oak. Definitely do it counterclockwise , you will appreciated the gentle descent after the never ending uphill.

hiking
8 days ago

Good, relatively short walk. Plentiful free parking. Good elevation, creates some good views. Would be good for a jog as well.

It’s a good hike for a windy day

hiking
8 days ago

I’ve been working up to this since last October, doing Mt Olympia, Diablo summit and the Eagle Peak loop separately. And man was this challenging. If you want to experience everything the mountain has to offer and are up for the blisters this hike is the one to go for. I went through 3.5L of water and got a Gatorade at the top so make sure you’re prepared and take long breaks to save yourself from the heat. The most challenging part in my opinion was the path between Olympia and North Peak - there was a good half mile section with thousands of tiny flies where you couldn’t breathe without inhaling a bunch of them, so bring a rag or something in case you run into that. There was also a girl who wiped out pretty bad going up the steep grade to North Peak, be careful! Also as another person said be cautious of poison oak I did see quite a bit of it in the woodsier parts.

hiking
bugs
over grown
8 days ago

May 11, incredible wildflowers, highly recommend this hike, it’s a good training hike too, pretty steep. Watch out for poison oak and ticks.

Hiked this trail again earlier this week from the end of Montaire Parkway in Clayton, and did it clockwise. I also hiked out and back up to the top of Eagle Peak. This is one of my favorite hikes on the mountain. Beautiful views. Lots of wildflowers.

hiking
9 days ago

Just hiked the trail again today. Lots of grass and brush intruding on the trail, so trail maintenance needs to be done. Luckily, there was no poison oak that I could see/came in contact with. I did get a tick crawling on my neck though. I recommend hiking early in the day and on a cooler day because there's not a lot of shade on this hike. Take the short spur trail to get to the actual summit.

Not an easy hike. Steep in a lot of areas going up and down. Wear hiking boots. Absolutely beautiful though, and definitely had some magical moments. Bring plenty of water. Gorgeous wildflowers and saw a lot of butterflies and hawks.

Wonderful views, and a LOT of interesting wildflowers

Nice lightly traveled trail. Great East Bay views.

that was tougher than expected. but a great hike.

Absolutely stunning views on this clear day. The hike is more strenuous than I anticipated with a lot of decent, meaning lots of ascent back to the summit. I started/ended at the lower parking lot. We hiked at a pretty good pace, didn't take breaks, and finished the loop in 2.5 hours.

Many wildflowers. The trail is narrow in spots and grown over lightly with vegetation, wear pants if that bothers you.

This was a serious hike to the summit from Regency! This trail suggests that you head up Mitchell Canyon to the peak but I went reverse and took the Donner Trail to the summit. Either way is a rough hike. If you head up Mitchell Creek to the summit, you’re on a 8 mile death march to the top and Donner Trail is a brutal but shorter 6 mile hike to the summit. Heading down Juniper Trail and Mitchell Canyon is certainly easier on the knees. Bring lots of water for this adventure and you can re-fill at the summit or Juniper campgrounds. FYI - This is not 13.7 miles and at least a 15 mile loop.

Loved it, completed the hike on April 28th 2019. Scenic views, wild flowers, birds. Reached at 08.00 am so found parking quickly, entry fee deposit in envelope. Wonder how they monitor it. Learn to read the navigation pole quickly, lost the trail 2 times and hiked 400 meter of elevation wasting energy. But had beautiful views of wilderness In the end its worth. If you are just focused on waterfalls, you might want to start the trail opposite way. Trail could be slippery and risky at few places in rainy season.

We hiked this trail in late April. The Creek was flowing and the wildflowers were blooming! We made it to the summit in about four hours. The hike was amazing until the descent. Going down the step inclines with the loose gravel really was painful on my knees. Will definitely hike this again but try a different trail down.

Load More