QUESTION: When Was The Last Time You Visited Mt. Diablo State Park?

June 19, 2017 10:00 am · 34 comments

QUESTION: When was the last time you visited Mt. Diablo State Park, and have you made it to the summit recently?

Clayton Squirrel June 19, 2017 at 10:17 AM

Part of my family stepped foot in the park last month but we look at it every day. My walking friends hiked there in May before coming to my house for a party (I’m not up to walking very far yet).

Don’t forget that there is an interpretive museum at Clayton’s Mitchell Canyon entrance too. The creek is still running. It’s the same Mitchell Creek that runs past the elementary school before flowing under Clayton Rd.

Bazooka Joe June 19, 2017 at 10:19 AM


The Observer June 19, 2017 at 10:31 AM

I drove up Mt. Diablo on the Saturday nine days ago. The temperature at the top was 48 degrees, and the wind was blowing over 30 mph. I later learned the wind was gusting as high as 52 mph. I’ve spent much nicer days in January up there.

Kentucky Derby June 19, 2017 at 10:32 AM

I hike there all the time. The summit? Back in the day.

Cowellian June 19, 2017 at 10:42 AM

In 2011, shortly before we left California, I attended a National Eagle Court of Honor on Mt Diablo. It wasn’t on the summit, but the view was awesome. And it was an amazing ceremony, totally unlike all the Eagle Courts I’ve seen in churches and schools.

We visited Mt Diablo again in 2015. The scars from the fire were still visible, but so was all the new growth that had been made possible by the fire.

Star Lord June 19, 2017 at 10:48 AM

Was up at Rock City last year to run some RC crawlers. I need to get back up there again.

Turn and burn June 19, 2017 at 10:55 AM

2 years ago when we spread his ashes.

Captain Bebops June 19, 2017 at 11:17 AM

2010 when friends from Seattle visited. He had been there before but his wife hadn’t. I was looking for a panel they used to have about Mt. Diablo a long time ago being volcanic but it was gone. Either they didn’t want to alarm people or current theorists believe it wasn’t.

WC June 19, 2017 at 12:07 PM

I don’t go up much. Too many bike riders. Another treasure spoiled.

WC resident June 19, 2017 at 12:09 PM

I’m in the foothills on state park land almost weekly. The last time we got at or near the summit was about three years ago. It was very foggy. From Clayton (Donner Canyon) we went to the top of North Peak, went around the main summit (but did not go to the summit), and then back down to Clayton.

hehaseesaw June 19, 2017 at 12:10 PM

I hiked mt.diablo about 2 weeks ago but I haven’t drove to the top for about a year now.

Shoulda Coulda June 19, 2017 at 12:24 PM

@ Captain Bebops

Never saw the panel about Mt. Diablo being volcanic.
I have seen a lot of seashell fossils in the rocks which
would indicate it’s not an ancient volcano. I don’t know
what the current scientific opinion is.

Silva June 19, 2017 at 12:25 PM

I overnighted last fall with my young grandsons. We stumbled upon a gathering of astronomers with nice scopes all set up and trained on lovely celestial things. Very cool. I was the most excited of all the family to look outward. I really don’t get up there enough. I love our mountain.

Polarbearmarket June 19, 2017 at 12:39 PM

Looking forward to finally going back to the summit on Saturday!

Kirkwood June 19, 2017 at 1:01 PM

I hiked from the summit over to the north peak summit and back in the 60’s. Left my sunglasses on a Dynamite box and never went back for them.
Last visit was a couple of years ago. I’m very interested in the geology of the mountain.

I'm The Urban Spaceman June 19, 2017 at 2:12 PM

about 70 times in the last 2.5 years.

Capt Bebops, There was volcanic activity in the Berkeley Hills, but not on Diablo, visit Sibley Volcanic Regional Preserve.

From Save Mt. Diablo>
Mount Diablo is not a volcano but it sure looks like one. If not volcanic, how was the mountain formed? Geologists are still trying to unravel the complicated history of the mountain — its rocks are old, but the mountain itself is very young.

The oldest rocks are located in the central and highest peaks. As you proceed downslope, away from the summit, the rocks are younger. The older core rocks were formed far at sea at a spreading ocean rift zone, as much as 165 million years ago. As a part of moving tectonic plates, they were brought to the North American continent and into a subduction zone. Part of this ocean crust and overlying sediments were scraped off the subducting plate and forced under some sedimentary material already here. This area was later uplifted, pushing up the coastal range. Meanwhile, before that happened, much of California was an inland sea, rising and falling from one ice age to the next, and into which rivers deposited the sediments. Ultimately these sedimentary layers were compressed into solid rock, typically sandstone and shale. About four million years ago the Diablo region was low rolling hills.

About two million years ago, the same pressures that break the earth along the San Andreas fault began to form a large-scale compressional fold. The raised sedimentary layers were eroded away and tilted up and now they wrap around the harder, older mountain core. The tilted sedimentary layers now stand almost vertically in places such as Rock City, Castle Rock, Fossil Ridge, and Devil’s Slide. Erosion has removed thousands of feet of what was overlying material, exposing the core as we know Mount Diablo, and carving fascinating features like wind caves and tunnels.

RunnerDope June 19, 2017 at 2:42 PM

Drove my wife and son up a month ago for their first time. I found my house in Concord using binoculars.

I used to run to the summit and back weekly; 3 hours.

whatever June 19, 2017 at 2:54 PM

I’ve hiked every trail in Mt Diablo SP at least once. Don’t go there much this time of year. Too damn hot! Last time there was in April when all the wildflowers were in bloom. We hiked the falls loop and the water falls were really flowing this year. It’s been a few years since I hiked from bottom to the top. I’ve climbed three different routes to get to the summit. I’ve also been on one grueling trek that took me to all four main peaks – Mt Olympia, North Peak, Main Peak and Eagle Peak.

I don’t partake in mountain biking, but there is plenty of room for them and me as well as equestrians up on the mountain.

Mt Diablo was created by a thrust fault and is not volcanic.
Go to MDIA which has great information on our mountain.

grandmato3 June 19, 2017 at 2:58 PM

2 weeks ago, I hike there all the time. Castle Rock Park to the summit and back was about 2 months ago about 16 miles total.

Kylie June 19, 2017 at 4:02 PM

I go there all the time, whether it’s to hike or to drive up to the Summit. I love this place so much I decided to get a small tattoo of the mountain. Mt. D truly is a Bay Area gem!

Affe June 19, 2017 at 4:07 PM

I spoil things for 12:07 WC and ride there a few times a week, work and toddler permitting. Lovely, relaxing and a real treasure. Have seen deer, rattlers, bobcats, coyote, golden eagles – still waiting for a mountain lion sighting but not much chance in the mid-mornings.

drivesatruck June 19, 2017 at 4:28 PM

Last time we where up there it bicycle hell, road hogs that don’t move to the right to let you pass. I will not drive up that mountain ever again

Mimi (original) June 19, 2017 at 5:12 PM

I would drive up more often if the fee would come back down.

Eat food June 19, 2017 at 5:28 PM


We have just as much of a right to the road as you. Big of you to threaten people who are actually getting exercise. Hope you get a solution for this pent up anger, or better yet, go ride a bike!


Jojo Potato June 19, 2017 at 5:46 PM

As a bicycle rider myself, I never go up that road. Used to a lot, starting in 1969. Now I refuse to be part of the bike nazis, there are a lot of better places to go, and that’s where I go.

Somberrunner June 19, 2017 at 5:51 PM

No bikes DO NOT have just as much right to the road up and down Diablo. There ain’t enough room on that road for bikes and all they are is a nuisance.

Silva June 19, 2017 at 7:15 PM

The cyclists amaze me. I don’t have any problem accommodating them, and it seems to work both ways.

Anon June 19, 2017 at 7:26 PM

I have been wanting to go up to Mt. Diablo, but I’m a scared driver. How narrow is the road? How do you turn around? Are there lots of steep cliffs? Which entrance is the best for safe driving?

Fritzhugh Ludlow June 19, 2017 at 7:47 PM

I last climbed up to Moses Rock in 1997.,(and drank a BEER!)

Dr. Jellyfinger June 19, 2017 at 9:19 PM

@ anon 28 ~ Stay home.

Silva June 19, 2017 at 9:20 PM

Anon, Where you enter has more to do with where you are coming from than safety. It is a curvy narrow road in many places up the side of the mountain, so yes, there are a few steep cliffs, but there is enough room for everyone. The last several times I’ve been up the road had narrowed to one lane for a few feet due to erosion, so it’s one car at a time in that short spot. There are a couple of switchbacks. To turn around you just head to the nearest pull out, driveway, campground, or picnic area, etc., or drive all the way to the top and check out the amazing view, conditions permitting. In any case it’s a remarkable change of scenery up there.

anon June 19, 2017 at 10:15 PM

I live very close to the entrance to the park, so I don’t really feel the need to pay the fee and actually enter. I do occasionally go to the top and have visited frequently in the close to 70 years we have lived in the area. I have camped there. I prefer to go on weekdays when the traffic is lighter. Visitors usually get taken there for sight seeing. I had heard always about the extraordinary view of the Sierras and the San Francisco skyline and had looked everytime I visited, but could never see either. Then, about ten years ago, there it was! It was spectacular. The snow-covered Sierras and the San Francisco skyline and Golden Gate Bridge on an especially crystal clear day and we could see it all without binoculars. It was extraordinary.

Captain Concord June 20, 2017 at 11:19 AM

I ride my bicycle on Mount Diablo regularly. A lot of drivers just don’t understand how to drive on winding mountain roads. Patient courteous and safe drivers get along fine with the cyclists; pretend NASCAR drivers should stay off.

Kerrie June 21, 2017 at 9:49 PM

I still have never been but I want to sometime

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