San Bruno Mountain

On May 16 we met a few friends for a hike on San Bruno Mountain. This is a state park covering 2400 acres representing an island of rugged open space in the middle of a highly urbanized environment. It is also home to a number of plants and animals that are endemic to the mountain.

It promised to be a warm sunny day as we departed Berkeley, but when we parked at the trail head we were confronted with a chilly and blustery wind with fog billowing over the ridge. I promptly broke out all my layers. We hiked the Summit Loop Trail starting at the parking lot just off of Guadalupe Canyon Parkway.

I was surprised at the diversity of habitats. This included coastal scrub, oak woodland, chaparral and riparian habitats. There are also a variety of wildflowers. This year the spring wildflower display was not as magnificent as it can be. Even so we saw a variety including iris, aster, foxglove, lupine and poppies.

I was also surprised with how lush and green the the mountainsides were. We hiked through tree tunnels and past glens of ferns. Quite a difference from our usual hikes in Tilden Park. Perhaps since the mountain captures the fog off the coast it gets more moisture than the East Bay Hills, providing more diversity.

We stopped where the trail crosses Battery 59 Road, just short of the summit and opted to retrace our route back to the car. This was deemed to be the preferred route, rather than continuing the loop with the idea that the rest of the loop is not quite as interesting. We were on the trail for a little over two hours and logged 4.5 miles. Definitely a place to revisit with diversity of plants and animals.

More photos are available in an online gallery.

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