Trails.com is merging with AllTrails! Please click here to read more.

Mount Diablo Grand Loop Trail

MODERATE 265 reviews
#3 of 75 trails in

Mount Diablo Grand Loop Trail is a 6.7 mile moderately trafficked loop trail located near Clayton, California that features beautiful wild flowers and is rated as moderate. The trail offers a number of activity options and is accessible year-round.

Distance: 6.7 miles Elevation Gain: 1,856 feet Route Type: Loop

hiking

nature trips

walking

bird watching

running

forest

views

wild flowers

wildlife

no dogs

The Grand Loop offers a bird's-eye view of the Bay Area, and sometimes glimpses far beyond, of the Farallon Islands, Mount Lassen, the Sierra Nevada, and the Santa Cruz Mountains. It's also a a hotspot for wildflowers in the spring.

hiking
no shade
rocky
8 days ago

hiking
14 days ago

Started in Juniper Campground, walked clockwise. Started on fire road and all down hill - which means a long way back up, and the inclines were steep. At Prospector’s Gap, trail got a lot more interesting and no more fire roads. Great views, way more interesting once off the road. Cool to reach the summit and then have a nice easy walk down the hill back to the car.

hiking
15 days ago

awsome ride..

hiking
21 days ago

Worth doing. Some parts have really nice views, others not so much. Probably should be categorized as hard.

hiking
rocky
22 days ago

Fantastic hike - though you better be ready with lots of water and some key rest stops. Loved the panoramic views of the East Bay and the mix of wide paths and switchbacks.

hiking
1 month ago

Beautiful panoramic views from every lookout point on a clear day. Amazing to see the changes in topography on every side of the mountain. I'd recommend requesting the written directions from the park ranger at the park's entrance. For novice hikers, we weren't lead astray. We saw ground squirrels, deer, tiny lizards, and plenty of birds. Definitely was hot. Thanks to fellow forum members for recommending the 3L of H2O. We headed counterclockwise (northwest) around the mountain and had our climatic summit at the end! The summit includes plenty of picnic benches, clean bathrooms, and water fountains for your enjoyment.

hiking
1 month ago

Very pretty and amazing rock formations.

hiking
bugs
rocky
1 month ago

Great trail! Be sure to take enough water, we took 3L each. Try to get there early to beat the sun too. We ran into a rattlesnake and ran back the other way haha.. gave it about 5 minutes, went back and it was gone. You’ll be fine, just keep your eyes open.

hiking
rocky
2 months ago

Great trail. Went in early August and had 3 L water each for experienced hikers. Rocky and gravelly in some places but rarely near the edge. Gorgeous views the entire trail. Took a short detour to the visitors center at the summit and it was also gorgeous. Almost no other hikers.

hiking
3 months ago

Differently not a summer time hike; take lots of water! Differently underestimated this hike. Slow going into the hike, but differently has some challenging hills.

hiking
4 months ago

Saw a few rattlesnakes crossing the road!

hiking
4 months ago

the park does a good job of keeping the trail away from vehicles. great views

hiking
no shade
rocky
4 months ago

This trail isn’t moderate, it’s actually hard!!!! Careful there are snakes on trail and make sure you use the app to not get lost and stay on track. Bring lots of water! At least a gallon will do.

hiking
4 months ago

Great trail. If the summit is in the clouds, I’d recommend skipping the spur to the top

hiking
4 months ago

Very crowded over memorial weekend! Very little wild live ..... maybe I am coming back an other time but I am not excited

hiking
4 months ago

Nice trail with beautiful views. A bit harder than I expected.

hiking
bugs
5 months ago

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.

hiking
rocky
5 months ago

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.

hiking
bugs
5 months ago

hiking
bugs
scramble
5 months ago

hiking
5 months ago

Amazing views all around this trail, we went counter clockwise and was good we did, (wear hiking shoes though). Would love to try more trails

beautiful trail at this time of year. flowers blooming everywhere and so much green. went clockwise as someone suggested to avoid a climb before warming up. the worst part of the climb is the last part of the fire read before taking the trail to the gap. the trail to prospectors gap was just amazing and my favorite part of the hike. took a side trail to the north peak which had great views but was a brutal climb and descent. not recommended without good hiking boots and trekking poles. I would definitely do this hike again.

hiking
bugs
5 months ago

Mount Diablo is a 5 star place to hike but I give the Grand Loop 4 stars because all the outstanding views are mostly on the south side from Deer Flat Road through Juniper camp to the Peak and to Devils Pulpit. Instead of doing this 8 mile loop, next time I would start at Juniper camp parking, hike up to the Summit & Devil's Pulpit to Prospector's Gap and then go down to the lower Summit trail and the lower Juniper trail back to the parking to have views throughout the hike. The only other place on the Grand Loop that had great views was the bald part of the Bald Ridge trail.

hiking
rocky
5 months ago

Beautiful views!! Definitely recommend doing it counter-clockwise, otherwise the hardest part of the hike is going to be at the very end.

hiking
5 months ago

Great trail but longer than listed here (it’s closer to 8 miles in distance). We did it counter-clockwise - I would recommend doing the same. It’s a tough start but then you have a long descent to recover before the final uphill at the end. Doing it clockwise would be tough given how long the continuous uphill section would be.

hiking
bugs
6 months ago

Load More

Featured Trails