nature trips


wild flowers


trail running

no dogs


kid friendly

mountain biking

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 spectacular. Many visitors to Mount Diablo head straight for the summit to enjoy the famous view. 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. 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. Gates open 8am and close at sunset. Visitors should plan to be in their vehicles by sunset and headed out to avoid being locked in.

Moderate hike!!!!! Love it.

Fun little ass kicker!

Nice moderate hike but the trail narrows quite a bit as you walk inside the canyon. Definitely on the treacherous side coming down, especially with all of the recent rains. A great place to hike after rain, as there are many waterfalls. No official parking, you just park on the street so get here early, especially during rainy season on weekends.

great hike, wide trail

Took Donner Loop, to Meridian Ridge, then looped back to Donner in about 4 hrs. With the recent storms, trails were very muddy, the waterfalls raging. There were so many beautiful areas to stop, contemplate, and appreciate. One of our favorite hikes.

Hiked Morning Jan 14. All open. Lots of water still. Muddy at bottom. Other hikers saw large patches of ladybugs. Also seemed quite busy, perhaps because of News posts about waterfalls. Great hike and will definitely come back to explore this area more. Can be bit of ass kicker for some.

such a lovely trail to be on... the soil is rich with history.

Muddy and slippery at this time of the year. Gusty wind and raining hard so make sure you guys have hiking boots with great tractions. Poles are great for incline. Worth it.

14 days ago

Definitely a good hike and workout to do during winters. I found the second half ( - after eagle peak )of the hike prettier than the first. Will definitely recommend hiking poles for the downhill. Very rocky and unstable. Fell down a bunch of times despite taking care.

It was a foggy day and we couldn't see much far away, but the nature we saw was beautiful. According to fitbit and myFitnessPall app the loop had at least 8 miles. Maybe the apps had wrong info-maybe the website. It seemed more than 6.3miles. But it took us 3 hours to go around. We had a normal, not fast or slow pace. I gave 5 stars to this trail. I am planning to do it again.

Rock City to Summit via Summit Trail. Hiked this with my 17-year-old son. It was great bonding time, and he was very patient with me. The trail is well maintained, which is nice. However, the trek up was tough for me. It took 3.5 hours to the Summit and 2 hours back down. I would rate it moderate plus some. There are virtually no switchbacks, so you are hiking uphill, albeit gradually, the entire way. Informational signs and center at top were interesting. Plenty of opportunity for bathrooms but no potable water sources between Rock City and the Summit, so come prepared and fill up when you can.

This was a challenging hike from the sandstone formations of Rock City up to the summit of Mount Diablo. This 9.5-mile double lollipop loop hike took 5 hours to complete. Much of the Rock City trail, Summit trail and Juniper trail are along the “Trail Through Time” with its interpretive signs describing 190 million years of geological history. At Rock City we hiked amongst the Wind Caves and climbed up Sentinel Rock before proceeding up the Summit trail. The summit is at 3,848 feet. When we were up there we had rain and it turned into snow. We returned on the Juniper trail passing Juniper Camp and back to the Summit trail.

Awesome.. great views at several points throughout, but the trek itself provides great memories should you go the entire way to the summit,

Mostly hills, several trails that are difficult to locate on GPS so unsure where they actually go. Beautiful views though. Unable to locate this "loop".

Yes, parking can be a little challenging since they put in rocks on small shoulder to stop people parking there. Park a little up the street or before.

Dogs are actually not allowed in Mt Diablo State Park - even leash.

Overall great hike, with mix of easy fire trail, good inclines, lower tree canopy for shade, and a ton of fun on rocks in Rock City. Be sure to climb up to top of Sentinel Rock! Can be a little nerve-racking, but you won't be disappointed.

This is typically a busy trail on weekends and need to watch for mountain bikes.

I would have given 5 stars, but agree parking is challenging. Looking at map, may be better to park in one of neighborhoods on left towards Stone Valley Rd.