Looking for a great trail in Sierra Azul Open Space Preserve, California? AllTrails has 15 great hiking trails, trail running trails, mountain biking trails and more, with hand-curated trail maps and driving directions as well as detailed reviews and photos from hikers, campers, and nature lovers like you. Ready for some activity? There are 10 moderate trails in Sierra Azul Open Space Preserve ranging from 1.2 to 18.1 miles and from 679 to 3,477 feet above sea level. Start checking them out and you'll be out on the trail in no time!

views

hiking

nature trips

running

bird watching

wild flowers

mountain biking

dogs on leash

wildlife

walking

As described by the Midpeninsula Regional Open Space District: "Overlooking the town of Los Gatos and the south bay, Sierra Azul Open Space Preserve is the District's largest preserve, encompassing over 17,000 acres of mostly rugged and steep terrain. The environment of Sierra Azul is strikingly varied. One can visit serpentine grasslands, hard, rocky, and steep chaparral, dense stands of bay trees, or quiet, shaded oak woodland forests. For the more hardy explorers, there are deep ravines and riparian corridors, some containing seasonal or year-round water flow. Wildlife is abundant in Sierra Azul. The entire Preserve is prime mountain lion habitat and also provides homes for deer, bobcats, coyotes, and many other species of animals. Sierra Azul ("Blue Range") is a true wilderness area, yet surprisingly close to the urban areas of the South Bay, making it a popular destination." Hours: half an hour before sunrise to half an hour after sunset

hiking
4 days ago

Mostly shaded. I suggest taking good shoes with support and a walking stick for the way down.

hiking
5 days ago

Great trail, went early and didn't see many other hikers until the way back.

hiking
bugs
scramble
5 days ago

Heavily shaded in most spots. Views are infrequent and often overgrown, and trail can be a bit of a scramble with scree in sections. Good for doggos.

hiking
rocky
5 days ago

Nice, solitary hike. The up (either direction) is not bad, plenty of shade when I went in early October. Bring water and bug spray.

hiking
6 days ago

Great trail for a morning hike. The trail is well-maintained and well-shaded in most areas; the hike is mostly easy and the views at the top are really nice, especially on a clear day. The trail was only moderately-trafficked, so that was a plus as well. We parked at Baldy parking lot, and started at around 8 and were back by 11.30 am, even though we took our time exploring the sacred site and the former air force base at the peak. We also saw plenty of deer and other wildlife. But please note that there's also been some recent mountain lion sightings.

hiking
8 days ago

Well maintained trail with a pleasant incline and shade. Nice lookout at about 1.5 miles in, and of course at the top. Otherwise enjoy the trees!

hiking
8 days ago

not kids friendly in my opinion. other than that, lovely. plenty of shade, wide trail, not crowded.

hiking
bugs
11 days ago

This is a pretty easy kid friendly trail with a beautiful view of San Jose valley. Lot’s of bugs and flies though.

hiking
13 days ago

Started at 2nd parking lot, very well maintained trail, lots of shades, gentle slopes, easy hike. Had lunch at ceremonial circle on the peak, enjoyed panoramic view of Santa Clara & San Jose, The SAGE building was an ugly concrete block but could be seen everywhere while hiking, guess it's serving as a 'light house' for visitors to Mt Um.

on Bald Mountain

hiking
13 days ago

Nice views, but Bald is an accurate name. No shade

hiking
14 days ago

Really fun trail with a nice, steady climb with awesome views. There were good amounts of shade, and I only encountered a few other people the whole trip (starting time of 9:30 on an October weekday). The trail is maintained very well, just the last stretch has a bit of loose rock.

The trail was great but the last 2 miles or so we’re on the road. It would have been fine on a bike but was disappointed foot. Definitely mountain lion country!

hiking
blowdown
16 days ago

My dog & I enjoyed this trail. I went at 230 on a tuesday & only saw one biker & one other hiker. There is poison oak on the side but the trail is plenty wide& it's easy to avoid. Went clockwise & there was plenty of shade going up. Some nice views but mostly just peaceful on the trail. There was a tree down towards the end that we had to make our way thru, but it was doable. Theres about 1/4 mile of walking on the road to get back to the trail, but luckily the road was very lightly trafficked. My dog loved it.

hiking
bugs
25 days ago

Hard. Very hard

hiking
bugs
1 month ago

on Mount Umunhum

hiking
1 month ago

Great Trail, nice mix of shade – 70% – slow gentle climb.

hiking
1 month ago

Drive up was already 10/10 scenic. 90% of the trial is shaded. Lots of switchbacks so it’s not too steep. Great view at the peak. Steady climbing to the peak.

hiking
bugs
rocky
1 month ago

Frist two miles are all up hill.

Very difficult. Lots of uphill and lots of slippery pebbles. Great workout!

hiking
bugs
over grown
1 month ago

The trail is very well maintained and signposted. It’s quite steep soon after the start, pretty much all the way to the right turn onto Priest Rock (4.1 miles). Then it’s steep downhill. After the left onto Limekiln, it’s flat for a while which was nice and easy going but then started getting steep again. At this point my legs started composing an official complaint to my brain ;-) I did it in 90 degree summer heat and drank 3 litres of water (take plenty as the shade is very sporadic). Overall, it took 5 hours (I’m 45 and in reasonably good shape for my age). Parking is limited, I was lucky to find a spot on the road. Only downside for me was annoying flies buzzing round my ears at some points.

hiking
bugs
1 month ago

hiking
bugs
1 month ago

Relatively flat for the first mile, then all up hill thereafter. In the summer evening most of the path was shaded. Bugs were a frustration.

Hiked in both June and August. June was better with wildflowers and butterflies. August had too many bugs to truly enjoy.

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