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Rocky Ridge

Las Trampas Regional Wilderness

April 20th, 2015

6.6 miles
2040 vertical feet
Total Time: 5:12

Starting elevation
1112 feet
Max elevation
1980 feet

Rating: 7/10

Directions: Take Highway 680 to Crow Canyon Road. Drive west for a little over a mile, then turn right onto Bollinger Canyon Road. Continue all the way to the end to the staging area parking lot. As of 2015, there was no fee. There are portable toilets, maps, and a picnic table at the parking lot.   View Driving Map

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Jean and I had visited Las Trampas Wilderness 12 years ago, hiking the Las Trampas Ridge side. At the time, I had thought to return sometime to visit the Rocky Ridge side. 12 years later, here we were.

After 12 years, parking is still free. Since it was a Monday, there were only a couple of other cars in the lot. A sign said the parking lot closed at 7pm (there's a gate), but we'd be done far before that. We got started off on our hike just before noon.

The morning fog had mostly burned off and it was sunny, but a chill wind blew. Clouds also still lingered on top of Rocky Ridge above us to the southwest. We passed a metal cattle gate to start the hike, then headed uphill on the paved Rocky Ridge View Trail. As we climbed, we had views of the cloud-topped ridge to our left, and increasing views toward Las Trampas Ridge to our right. On our previous hike to Las Trampas Ridge, we had encountered hundreds of caterpillars. On this trip? Zero. Perhaps our timing was off, or it was the drought, or caterpillars are more prevalent on the other side of the park.

Heading up the paved Rocky Ridge View Trail

The trail, while wide and paved at this point, is quite steep. After about a half mile, after passing the Cuesta Trail intersection, we turned left to continue on the single track portion of the Rocky Ridge View Trail. A trio of hikers descended toward us as we climbed. In all I'd say we saw about a half dozen other people on the entire hike.

Cows seen from the trail

Looking back down the Rocky Ridge View Trail

Heading up the single track section

As we climbed, we gained views of Mount Diablo peeking over Las Trampas Ridge to the northeast. At our feet we noticed what looked to be a sea shell imprint, apparently evidence that this land had once been under water. We also saw bright orange poppies and some other purple wildflowers in abundance.

Lizard on the trail

California poppy

Poppies next to the trail

Mount Diablo rises to the northeast

Sea shell impression?


After having climbed steadily for a while, the trail is now relatively flat for a while. The clouds were gone, but it was still windy. A fence marking the park boundary runs along much of this section of the trail, to the right. Beyond that fence is land owned by EBMUD; you need a special hiking permit to enter that area. We did not have such a permit, but were content to stay within the confines of Las Trampas Regional Wilderness.

Continuing up the trail

The trail widens into a dirt road, and then shortly thereafter we turned right onto the Sycamore Trail. This single track heads downhill toward a ridge with rock outcroppings. The rocks have been sculpted by the wind to form small caves. There's a fence running along the ridge here, denoting the EBMUD boundary. We found a nice spot for a lunch break among the rocks on our side of the fence. While we ate, raptors circled the skies 2, 3, and 4 at a time. They kept circling and swooping, putting on a great aerial show that we enjoyed and I tried to capture as much as I could with my camera. There's something almost magical about raptors in flight, something that made it hard for us to pull away, which we finally did after about an hour break.

The Sycamore trail heads into the grasses

Heading toward our lunch stop

Sycamore Trail


Probably a turkey vulture

Two raptors in flight

After lunch we continued along the trail, which continues downhill and then very briefly heads up and over a small ridge, revealing great views to the west. Now the trail descended in earnest, at some very steep inclines. Rolling green hillsides greeted the eye for miles. The chill wind we'd endured earlier was nowhere to be found, replaced by the afternoon heat. Much of the descent here is unshaded.

View looking west from near the top of the ridge

Continuing down the west side of the Sycamore Trail

In the distance we could hear some periodic pounding, perhaps some construction or quarry work. We could never quite identify where it was coming from, though. It sounded like somewhere to the west or south. After about a mile of descent from our lunch spot, we reached Cull Creek. Or rather, we reached where it would be, if there had actually been any water. Instead we saw a dry creek bed. We crossed the creek bed and then turned left onto Devil's Hole Trail.

Devil's Hole Trail is a wide dirt road heading back uphill toward Rocky Ridge. Why is it so named? Perhaps it has something to do with the fact that the trail is devilishly steep. It starts out at about a 20% grade, when the afternoon heat starts to take a toll. And *then* it gets comically steeper, 25-30% in places. At least there are a few shaded spots. You get a brief respite where it levels off very briefly approaching a large rock face. But then the climbing kicks in again.

Looking back on Devil's Hole Trail

Green hills as far as the eye can see

Heading up the Devil's Hole Trail

As we neared the top, we could again see raptors soaring in the skies to the south. Looking back to the west we could just barely make out the bay beneath the afternoon haze. At this moment it struck me that it's amazing this place even exists - a large patch of wilderness in the middle of the densely populated Bay Area. In some directions I could not see any buildings at all, far off into the distance. Just rolling green hills as far as the eye could see. This didn't seem possible since I knew the park sits in an area completely surrounded by busy freeways - Interstates 580, 680, and Highway 24. And yet here it was.


Looking back down the Devil's Hole Trail

The grade finally relents near the top, though the wind kicked up again. And it was fairly howling as we crested the climb and started down the other side. We soon reached an intersection with the Rocky Ridge View Trail, where we had two choices. We could either go right and then turn left onto the Elderberry Trail, which would take us back to the parking lot. Or we go left, then turn right onto the Cuesta Trail, which would return us to the paved trail at the beginning of the hike. We had read that cows graze the land near the Elderberry Trail, so we decided to take the Cuesta Trail instead. However, that would turn out to be a mistake in some respects.

Final push to the top of the ridge

The Cuesta Trail roughly parallels the Rocky Ridge View Trail most of the time, though the trail almost disappears in places, just being patches of flattened grass. It wasn't too hard to follow the trail, however. As we got closer to the paved trail, however, we encountered more and more cows grazing. Many of them were directly on the trail. We had to detour off the trail once, and slow down and wait for them to leave the trail on a couple other occasions. It was a weird way to end the hike.

Cows near the trail

Cows next to the trail

Cattle on the hill

After passing the last cows right at the paved trail intersection, we continued down the paved trail, only briefly veering off to the left onto some unsigned single track that shortly rejoins the paved trail. At the bottom we passed the cattle gate and returned to the parking area.

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