Explore the most popular mountain biking trails in Sierra Azul Open Space Preserve with hand-curated trail maps and driving directions as well as detailed reviews and photos from hikers, campers and nature lovers like you.

Amazing views at the top.

on Mount Umunhum

4 days ago

Nice hike. Shaded all the way. One thing i don’t like is that it opens late; it says open and closes at sunrise and sunset, so you won’t be able to go there to see the sunrise. Bummer!

hiking
8 days ago

Tough for a beginner, all uphill, but a great trail!

hiking
14 days ago

This is a fairly straightforward hike. The trail is well maintained and not too heavily trafficked, especially early in the morning (i.e. 7am). The ascent is very gradual to the top and not strenuous with the exception of a few sets of stairs to reach the summit. The summit gives some great views of the surrounding area and some information on the history of the area.

Overall, this is a good hike that can be done fairly quickly and offers some good views.

15 days ago

It was a well maintained, shaded trail. There were a couple of really nice scenic view points...and deer! Caught glimpse of a creepy, rusted wrecked car on the way back...did someone drive off the main road and roll down the cliff?? I wish the building at the summit was open to wander around in...but overall a good hike!

Very nice hike. Not for the beginners. Mostly shaded. View from the peak is awesome. Gates are not opened till 7 AM in the morning, even in summer. Not of much place on the side of the road to park the car. So, going early may not be advised.

1 month ago

Very nice trail, shaded most of the way. Elevation gain is graduate and not too steep. Beautiful recreation spots at the top: picnic tables with lots of shade, placards to teach about the place, the Indian tribes who lived here (and still have ceremonies here) and the history, beautiful overlook, even a restroom at the top (also at the beginning). took us 4 hours with lots of stops and breaks.

Very challenging and fun hike. It’s very steep early on heading up Priest and also very exposed. I started around 8:30am and it was pretty warm by 9:30. Wonderful views near the top and Linekiln on the way back down was a nice change with a little more shade. Loved the elevation change on this hike. Light traffic on a Saturday, very nice.

Fun & challenging mt. Bike ride from Hicks parking lot. About 1.5 mi. Of very steep section in the middle. The last 3.5 miles are very nice.

For a shorter hike to the peak park at the Bald Mountain Trailhead. Most of the trail from here is on a inclination but is shady. We started our hike at 3pm on a hot day and it was stilla great hike! Next time we'd start with

walking
1 month ago

Great hike, very well maintained, not too crowded

Went on a Saturday at 8am. Woods and Barlow were pretty quiet, but Umunhum was pretty busy. Great long hike with a great view at the summit.

Great workout!!!! Trail running at its best!

This is one of the trail we like the most and hiked the most. It may be quite challenging for the beginners. The steep hike gives you great workout, the best hike near Los Gatos in the winter time. I wouldn’t recommend for a very hot day because most of the trail has no shades.

3 months ago

Beautiful, well maintained trial with plenty of shade, lots of interesting flora and some fauna. The incline is very steady, with no real steep parts. The view at the top is awesome.

After conquering the trail from the Bald Mountain parking lot, we decided to go for the full beans and hike the 16 miles from the lower parking lot. Overall, not a bad hike. We left at 7am and got back to our car at 12:40 or so. The first half of the trail is nice and steep. Most people don’t take this route so it’s pleasantly quiet and unpopulated. You end up merging with the Bald Mountain trail and finish the ascent using that same route. Lots of interesting wildlife: foxes, snakes, butterflies, birds, and deer. The hike is mostly covered so you don’t have to endure the full strength of the sun on this trail

Challenging but very nice!

hiking
3 months ago

Giving this 3 stars only because it qualifies as a good urban hike. Tons of people and views are so so. It is a great way to get the family out and not a far drive away from suburban/urban life. A couple of nice placards review the history of the building at the summit. Mild elevation gain makes this doable for all ages.

Only good as a training hike. It is hot with little shade. Views are nice in places. Few people some mt bikers. The trail is a road so there is plenty of space for all.

Only hiked to Priest rock and back on Kennedy because it was very hot, most of the hike is in the open/sun, and I didn’t want to run out of water for my pup and I. Four miles up hill... saw a rattlesnake on the way up and a fox near the top. Lots of sparrows and butterflies along the way. Irises are blooming now. Bring more than one canteen if you’re planning to hike this in the summer!

The parking is limited and not the easiest to back out of if there’s other cars parked.

5 months ago

Second time today - same gorgeous hike. First time was right after the trail opened. The newly installed gates at the Hicks road intersection and Bald Mountain parking lot open automatically at 7 am and stay open until after half hour past the sunset.

5 months ago

Hike was pretty easy. When you start your hike and you’re in the woods, there’s this abandoned blue buggy down the hill. Looks super creepy and there was barely anyone on the trail also. Views were alright. I traveled far for this hike but it was eh.

Hiked 4.7.18, right after bay area storm, and pleased that trail was very passable, a little muddy in places, but not much. parking, restrooms were very convenient, trail was very nicely graded, creeks, shades, wildlife (I saw deer, chipmunks, bobcat, and lots of birds), wildflowers, and great views. Very pleased with today's hike.

It’s a nice trail. Gets quite steep at a few spots. That coupled with the total length can make it a hard one. If you’re a regular hiker this should be a nice 4 hour workout. Not too easy but definitely not crazy hard either.
Views up top are nice. Nothing much to see along the way.

hiking
5 months ago

Nice cool walk

6 months ago

IMPORTANT NOTE: the directions take you to the crest of the trail, which is fine if you'd rather go downhill first. if you want to start at the trough as shown in the map, the parking lot you want is the "Sierra Azul open space preserve at Mt. umunhum road parking lot" on Google maps. Great hike, fantastic views of the South Bay.

hiking
6 months ago

Not a strenuous hike. But it’s beautiful. On the weekends parking can be a hassle so I’d recommend getting there early. I’d say the hardest part of the hike is the end.

6 months ago

Spectacular 360 degree view of the Bay Area in top! I could see the Bay Bridge, Lick observatory, and Santa Cruz mountains. The hike itself was moderately easy with lots of shades. I spotted some melting snow near the top. Overall, great hike. Recommend going on weekdays or going early on weekend because parking is limited. I started from the second parking lot for a total of 7.7 miles hike

6 months ago

moderate uphill, not much of a view at the top.

on Mount Umunhum

hiking
6 months ago

I’m so glad they opened this preserve up after so many years of being closed. Great hike with decent amount of shade, but there are plenty parts of the hike that are not shaded - so dress in layers would be my advice. Once at the top, it can get quite windy but the views are beautiful. For those who cannot hike the distance, there is a road for cars that will lead you to the top as well. Oh, on a side note, I did come across a tarantula cruising along some rocky path at the very top! So watch your step!

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