Juniper to the Summit Loop Trail and Meridian Ridge is a 6.3 mile moderately trafficked loop trail located near Walnut Creek, California that offers scenic views and is rated as difficult. The trail offers a number of activity options and is accessible year-round.

6.3 miles
1,955 feet



mountain biking

nature trips

trail running



no dogs

Hike to the summit of Mt. Diablo. This loop trail circumnavigates the summit and you will enjoy stunning views in all directions. This is a must do if this is your first time to the State Park. Take the Juniper Trail to the Summit Trail. Then North Peak Trail to Prospectors Gap Trail. Return via the Meridian Ridge Trail. At the summit 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 elevation, and still farther north to Lassen Peak in the Cascades at 10,466 feet

5 months ago

Great sweeping views, really awesome! We hiked counter clockwise. I recommend hiking sticks as many parts of trail are steep with loose rock. There was a lot of poison oak, sometimes very close to the trail. Take water! We started hiking at about 830am. Good to start early. Road to Juniper has lots of bikes and traffic. $10 per car fee at gate.

6 months ago

Counterclockwise. This was a very difficult trail. Not because of the length or up and downs. Bit because of the “slipperiness” of the trail. The down hills especially had to be traversed with baby steps because if this. And lots of brush overhanging the trails not good for ticks and poison oak. $10 self service to get in. All day never saw a park employee. I will not be back and don’t suggest this trail, not much fun.

9 months ago

If heading clockwise, your first 2+ miles are generally downhill. Then the (choose your adjective) begins. 3+ miles up. And on some stretches, it’s very steep, and doesn’t seem to let up. However, the vantage points near the summit are worth the weary legs (and lungs).

Enjoy a savory meal and a beverage afterwards. You’ve definitely earned it.

10 months ago

Great views from above the fog line. Well maintained trail, half on fire road. Start counter clockwise if you want less steeper climbs.

Friday, September 29, 2017

Went with a group of guys and no one fell out but, people started to slow down closer to the top. Make sure to bring water, since we are young and stupid guys... we decided to start this trail at 11:00 AM local time and ended up exposed and in the open, which is 90% of the fire-trail.

Good Exercise and awesome views, this is a definite!

Thursday, August 24, 2017

A lot of this is on a fire road rather than an actual trail. We went clockwise, starting on Meridian Ridge and ending on Juniper. The bits that weren't on the fire road were nice, but the fire road itself was steep uphill and downhill all the way. Bring three-four water bottles on this hike and be prepared for a beating! I woke up with a nosebleed, and I'm going to be sore for days.

Monday, July 03, 2017

Hiking to the summit is hard and you will need plenty of water and a few snacks to keep your energy up. Don't forget your sunscreen and insect repellent. Hard hike but worth it!

Sunday, May 28, 2017

Parked the car at the Juniper overlook (no signs that said you couldn't!). Went clockwise direction so I could finish downhill. Took the Bald Ridge Trail as a "short cut" - walked right by it the first time, it's a bit hidden. It's very goaty, steep, rocky, and lots of poison oak. But shaved a half-mile off the lower trail. Nice visitor's center at the summit. Hazy summer day, but still impressive views.

Saturday, April 22, 2017

Definitely recommend taking the Bald ridge trail as a short cut. Lovely views.

Friday, March 31, 2017

Beautiful blooms this year. Challenging hike but worth the views.

Sunday, March 12, 2017

first timer on this trail and ap.

Sunday, February 05, 2017

This trail should be rated as HARD. Not moderate. Extreme inclines and declines. It's a GORGEOUS loop, just be prepared for the 6.5 miles of a solid hearty hike!

Monday, January 23, 2017

Great views on the way to the summit!

Tuesday, January 03, 2017

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.

Sunday, November 06, 2016

We did this route clockwise with some variations. We start at the Diablo Valley Overlook (DVO) parking area (near Juniper campground).  We hiked to the summit with a short side trip to Moses Rock Ridge, taking the Mary Bowerman Trail around the summit and then up to the summit itself for a break.  We then went down to the south, connecting with the Summit Trail and returning to the DVO via the Juniper Trail.  This hike was 6.5 miles, 1,371 feet of climb with many great views.

Friday, August 26, 2016

Great trail that allows you to take many different routes. Gives you a view from every side of Mt. Diablo with some good elevation changes.

Friday, August 26, 2016

Some good exercise

Monday, May 02, 2016

Did this route clockwise. Pretty good hike with some unrelenting steep sections. Great workout, but little shade... bring a hat, sunglasses and sunscreen if you are doing this April to October.

Wildflowers of every color were in bloom on the slopes in early May. I suspect they will disappear by June.

As a side note, we encountered many thousands of flying earwigs at the summit and the entire east face, which were not present the day prior.

Friday, December 06, 2013

Real score 2.5. I did the grand loop leaving Juniper Campground. The majority of the trail is actually a fire road and for that reason I rated so low. The major elevation gains on the north portion of the loop are a bit challenging but nothing too crazy. Things pick up on the north east/ eastern side of the mountain. Great views. Part of the mountain was absolutely scorched in fires a few months ago giving portions of the hike an eery beauty to them. I went early on a Saturday morning before the crowds arrived. Overall an enjoyable experience in the future I'll check out the other actual trails in the park.

Friday, January 11, 2013

I did a variation on this trail that doesn't seem to be listed in this app so ill review it here. You take Juniper up to the summit, which is steep but well worth the amazing views. From there you take the North Peak trail from the summit parking lot. This will take you east an then north to the Bald Ridge trail. The view descending around the mountain are AMAZING. It's like you're at the top of the world. There is a rock outcropping there that you can snap a few cool pics at too. Bald Ridge trail will take you across, you guessed it, a bald ridge and then down through a manzanita grove to Meridian Ridge road (fire road). This is where we had lunch. Meridian Ridge road will then take you to Deer Flat road which is a hearty ascent back up to Juniper campground. I would rate this as moderate to difficult because of the elevation changes. It seemed that most people were going the opposite way, clockwise, around the mountain, but if you go that way you will be going uphill all but 2 of the just over 7 miles. Bring plenty of water, snacks and lunch, a camera, sunscreen and a hat. The park is extremely well maintained/groomed with clear markers at each trailhead. I would still recommend a physical topo map and compass though.

Thursday, August 30, 2012

Three of us hiked Juniper Trail from Juniper Camp then took the Summit Trail all the way to the observation deck at the top of Mount Diablo. The views were incredible. I am new to hiking and in not that great of shape so hiking up the incline all the way up was challenging for me. I had to stop to catch my breath a few times. I felt bad for Doug and Jerel who had to wait for me. Arriving at the top to the observation deck was well worth the hike. I hope to do a lot more hiking to get in better shape because I think I've found a new hobby.

29 days ago

recorded diablo

3 months ago

5 months ago

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