Mount Diablo Grand Loop Trail is a 6.2 mile heavily trafficked loop trail located near Clayton, California that features beautiful wild flowers and is rated as difficult. The trail is primarily used for hiking, walking, running, and bird watching and is accessible year-round.

Length6.2 miElevation gain1,797 ftRoute typeLoop
HikingWalkingBird watchingRunningForestViewsWildflowersWildlifeNo dogs
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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 hotspot for wildflowers in the spring. From Juniper Campground follow Deer Flat road to the northwest to gain Meridian Ridge. A mild descent along the ridge leads through valley oak and grey pine to a crossing of Deer Flat Creek where the trail begins to climb to the prominent knoll on Bald Ridge. Continue on Bald Ridge Trail passing by brilliant displays of wildflowers in spring and early summer, until you reach Prospectors Gap. Stay south and follow north peak trail as it wraps you west around the base of Mount Diablo before connecting you back to the parking lot at the campground.

Save Mount Diablo http://www.savemountdiablo.org California State Parks Foundation http://www.calparks.org/ Phil Heywood, Guitarist http://www.philheywood.com Joan Hamilton, Audio Guides to the Outdoors http://www.audioguidestotheoutdoors.com

You can rush through this walk in 2 or 3 hours. For maximum enjoyment, though, allow 4 to 5 hours, and plan for a glorious top-of-the-world picnic. Take plenty of water, especially on hot days in the summer. Spring temperatures and flowers are delightful. Views are generally best the morning after a winter storm. Bring layers of clothing in any season. In the winter you can even encounter snow and ice! Poison oak is a problem on some parts of the trail, but you can easily wriggle around it.

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Reviews (847)
Photos (3,235)
Activities (789)
Completed (2,693)
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Lily Jordan
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Hiking

Beautiful flowers. But we did it CCW and it was SO steep and slippery for most of the downhill section of the trail which was kind of scary! Wear good shoes and bring poles and get ready to slide down in your behind if you’re like me ;)

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James Kopperud
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Hiking

beautiful. bring water. more then 2 or 3 !

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Carlos A
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarApril 14, 2021
Hiking

Fantastic hike! A nice workout with a lot of wildflowers everywhere right now. You hike down to Deer Flat Creek with nice views of Black Point. Then you hike up to Murchio Gap. From there you take Bald Ridge Trail, which was my favorite trail because it was single-track. Then land at Prospectors Gap, the saddle of Mt. Diablo. Views up at Mt Diablo were amazing. With every prominent peak, town or landscape in site.

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Dan Raskop
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Hiking

Spectacular Views. Lots of wildflowers. Surprisingly very few hikers on this mild temperature Tuesday afternoon. Took us five hours to go 7 miles. Strenuous but rewarding hike!

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Mike DeMicco
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HikingGreat!

Hiked it today in the CCW direction. That last vertical up the steep fire road to Juniper Camp was hard. Very beautiful with lots of flowers.

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Matt Benca
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HikingGreat!
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Linette Gomez
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Hiking

Perfect! We went clockwise. Great views. Wore running shoes which made it a bit difficult since it is a rocky path.

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Lindsey Pollaczek
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Hiking

Strenuous and hot! Great views ! Amazing flowers!

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Tj Lanzetta
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HikingGreat!

Great trail if you’re looking for a tough hike with incredible views! First two miles were downhill but the next 4 had spectacular views the whole way with lots of wildflowers. Bring sunscreen and lots of water

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Joel O.
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Hiking

Awesome trail and plenty of wildflowers right now. Was low 70s and sunny clear skies when I did this, which was perfect. Could get brutal in high temps. Would have subtracted a star for the significant fire road portion but wildflowers keep it at 5 stars!

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Jessica Schaffer
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HikingFeeGreat!Rocky

Amazing views! Went clockwise as most reviewers suggested and the first 2 miles were downhill which left the remaining miles all uphill. As an avid hiker going into this hike I didn't think it would be 'hard' as it was listed based on the stats but boy was I wrong! More challenging than expected but the wildflowers and views of the bay area all made up for it. I would say that hiking shoes are a must with the terrain and poles were an added benefit. Bring lots of water as there were no areas to fill up until you get to the visitors center which is 3/4 of the way into the hike (if you choose to go up there). The parks website said that the gates open at 8AM but we were able to get through the first gate around 7:40AM with no issue but you could get stuck at the second gate where the ranger station is if you get there before 8AM ( we passed through after 8AM). Would totally hike this trail again!

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Andrew Twyman
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Hiking

Good variety of terrain, with some challenging climbs. Great panoramas in all directions, and beautiful (and fragrant!) wildflowers this time of year. Be careful, the turn onto the Bald Ridge trail is easy to miss. This route bypasses the tower at the peak, but I added a short side-trip to see it.

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Courtney Bishop
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Hiking

Amazing hike! Bring your hiking shoes and poles. Great training for future hikes!!

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Cody Hatch
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Hiking

This is a top tier trail! My only mistake was missing the Bald Ridge Trail intake.

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Meena KB
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Hiking

Hard hike but fun! We took our time as we enjoyed the wild flowers and the vistas!

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Mitchell Marubayashi
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Hiking

Hard. Fun.

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Phillip Casanares
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Hiking

A constant buzz with everything in bloom.

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Kalyan Neelamraju
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Hiking

A mostly lightly trafficked trail (85% masked). Overall, a challenging and beautiful hike with open and covered sections. Mt Diablo often lacks water at many of the marked fountains, so best to bring what you need. We went to the top of Diablo - how can you resist when this trail brings you so close to it? Tip: The turnoff to Bald Ridge from Meridian can be hard to spot (...it's a bit hidden by bushes and it's a narrow single track), so definitely have your phone out a bit after you've passed Deer Flat Creek to know where to turn to the right.

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Arun Sood
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Hiking

Great trail! Hiked this 4/3/21. Had a great time with excellent weather. Exposed in some parts which led to a lot of wind, but lots of beautiful vistas. Would repeat!

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Rebecca Duffy
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Hiking

solid home - perfect in the spring, a good mix of cover. recommend clockwise

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Stacy Davis
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Hiking

This trail is no joke I hike often and am in pretty good shape. Make sure to stop at junctions and check your map. It’s easy to make the wrong turn which can add distance and more incline.I almost wore running shoes thank god I didn’t. This trail requires hiking shoes the gravel is slippery and it’s vertical. Beautiful views gorgeous wildflowers but boy is it steep clockwise or counter clockwise it an 1800 ft climb, I went clockwise as suggested.

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Alyssa Albek
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Hiking
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Luke Melikian
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Hiking

Start of fhe trail only has around 30 parkinng spots!

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John Smesko
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Hiking
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Katherine Mullin
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Emily Podhradsky
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Claire Logan Hankla
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HikingNo shade

Beautiful views, but the incline all happens at once. If you have bad joints, take this one slow. Seriously. Very exposed, so I recommend going in the morning and wearing sunscreen. Felt like we circle the summit lookout toward the end, which became frustrating. Great views of the bay! AllTrails didn’t record the first mile or so of the hike. Stayed at Juniper Campground. Pay to get into the park.

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Madeline Eppley
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HikingGreat!

This trail is rated “hard” on AllTrails with good reason - it’s challenging! Went on a Friday and started the hike around 1pm, finished by 5pm. Most of the trail is moderately exposed, so sunscreen and a hat is a must. It’s worth noting that the trail doesn’t summit the peak; to summit adds an additional 0.2 miles and likely a few hundred extra feet of elevation gain. Beautiful views of the Bay Area and Eastern CA counties. A can’t miss hike in Mt Diablo state park, but one you’ll only feel the need to do once!

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