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Mount Diablo Grand Loop Trail is a 6.8 mile heavily 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.

Length 6.8 mi Elevation gain 1,814 ft Route type Loop

Hiking

Nature trips

Walking

Bird watching

Running

Forest

Views

Wild flowers

Wildlife

No dogs

Description
Waypoints (8)
Contact
Tips

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.

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.

Weather
UV Index
Daylight
Reviews (435)
Photos (1925)
Recordings (314)
Completed (1307)
Priscilla Pieters
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarSun Jul 12 2020
Hiking

beautiful but do not attempt this at 100F you might die

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Will W
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarGray StarGray StarSat Jul 11 2020
HikingNo shade

Definitely not a moderate hike. Should be rated Hard.

Georgiene Ignacio
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarSat Jul 04 2020
HikingNo shade
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Jerry Alcones
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarSat Jul 04 2020
HikingNo shadeRocky
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Grant Stone
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarSun Jun 28 2020
Hiking

Awesome views, lots of steep climbs, and cool mix of terrain throughout. Bring at least 3L of water per person on a hot day. The roads in the park are full of bikers and it’s difficult to pass, so it can take awhile to get to the trailhead.

Cristina Patrizio
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarSat Jun 27 2020
HikingBugsNo shadeRocky

We ended up taking a slightly longer path than this - ended up being 8 instead of 7 miles - but it was a rewarding physical challenge! It is so hot on the trail with minimal shade, so bring tons of water. It was definitely a difficult hike for me but worthwhile to check off the list.

Kyle Kotecki
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarSat Jun 27 2020
HikingNo shadeRockyScramble

Great views of the Bay Area and not terribly crowded. Trail can be narrow so passing is the only downside. This particular loop isn’t marked as such, so following all trails is a must.

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Roxana Castellón
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarSat Jun 27 2020
HikingBugsFeeNo shadeRockyScramble
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Andrea Sy
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarSat Jun 27 2020
HikingNo shade
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Marc Guerrero
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarGray StarGray StarSat Jun 27 2020
Hiking

NOT A MODERATE TRAIL! This trail is close to HARD for the average person. Maybe moderate for the avid/“pro” hiker. When on this trail, bring lots of water, especially during the hot days. Felt dehydrated in the middle of the hike because we didn’t have enough water. Going counter-clockwise like a few people recommend was a good choice but that last mile sucks on the legs going up. AGAIN, NOT A MODERATE HIKE (IN MY OPINION) FOR AN AVERAGE PERSON!

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Brittany Chandler
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarFri Jun 26 2020
HikingNo shadeRockyScramble
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Brenda Herrera
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarThu Jun 18 2020
HikingBugsNo shade

I must say this was a challenging hike for myself, but worth it. Once you get to the top, there’s beautiful views of the whole city. I would recommend going early in the morning, because as it gets hot it becomes harder to finish it. Theres some parts where is straight but for the most part it’s pretty steep. Take lots of water and sunblock.

Carol N
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarSat Jun 13 2020
Hiking

Moderate to hard hike. Lots of uphill and downhills. Narrow paths. Slipped twice because of the frequent gravel, but pretty small falls. We didn’t have hiking shoes on or hiking sticks, but still manageable. The map on this app was a complete life saver! Pay attention to which trail to take when there are forks. Thank goodness there’s signal up there for the most part. We went clockwise despite hearing & seeing everyone going counter-clockwise. We didn’t regret our decision as there were some segments I was grateful we were going uphill instead of the other way. When we were driving up to Juniper Campground, we were unsure of where the entry gate was. Just keep driving! Parking is $10. Open despite COVID-19 on 6/13/20. Not many went on our direction, but did see groups along the way. Would totally hike again! Great workout.

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Miriam Wyatt
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarSat Jun 06 2020
HikingRocky

A lot of micro climates and types of terrain. Beautiful biodiversity. Went with Michaela and Siri. A lot of up and down.

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Benjamin Moore
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarSat May 23 2020
HikingNo shade

Great views from the tallest peak in the area. Be sure to bring sun protection and watch out for snakes in the summer. Restrooms at the summit with cool war era history to read up on.

chad harris
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarSat Mar 28 2020
Hiking

I love the hike from before but I went on March 27th and it was closed because of the virus be careful

zachary hauser
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarSun Mar 22 2020
HikingRocky
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Hansen Qian
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarSun Mar 22 2020
HikingFee

Great trail; well maintained! Took about 4 hours for our group to do the loop with breaks.

View Hansen's Recording
Showing results 1 - 18 of 435