New road makes driving to the the top of Mt. Umunhum easy even during the worst weather conditions. Very fun to go if you like to experience weather. Excellent views on clear days. Stunning native fauna.

Kennedy trail is awesome fo rd mountain biking. A big steep but great challenge

Trails around Mt Umunhum have been a great pleasure. The views from the top are wonderful. One can drive all they way up to the top - a real blessing for our aging parents. The peak gets a smattering of snow in the winter. The trails have ample shade - which is helpful in the summer time. Facilities and trail upkeep have been getting better.

Unlike most mountain top radio sites, this one has paved roads and a parking lot at the top. You can reach it in an ordinary passenger car - no 4WD needed. The large concrete building is one of the old SAGE RADAR sites from the cold war. I sure hope to see it as a museum someday since it is historically significant.

Road is a little much for the weak of stomach, but the view on a clear day is spectacular. Good signage for directions and for area landmarks.

Beautiful. Easy to find a spot all by yourself amongst the redwood trees. Good for the mind and spirit.

The best place to mountain bike locally. Trails are well maintained and fun to ride.There are parking spaces most of the time. Specially Saturday afternoons!People flock to this park, however, you still feel pretty isolated because the trails are so long that you encounter people sparsely. It feels this way anyway. Also l, part of the trial runs along Calero lake and it has a very nice view. Go here and check it out for yourself! You wont regret it.The only problem I see here is that the parts of the trail are very narrow. So riding fast is a bit dangerous . Other than that, the best place to ride.

Mt. Umunhum is a must see. Great hiking and views of the Valley and Monterey Bay. Great place to take in a sunset. Parking at the top is good and a short paved climb to the observation deck overlooking San Jose and the surrounding hills.

Mt Umunhum is a must visit. They have a well maintained park that has perfect trails for hiking when its really hot out since it is shady. Beautiful scenic views. Moderate hike which you can start from the top or the bottom. It is one of my favorite trails.

An absolutely stunning location. Just opened, new roads, parking, trails, picnic area. The views are phenomenal. I highly recommend going. Bring lunch and smooth the views from the Ocean, Santa Cruz, to Silicon Valley and My. Hamilton!

Great views and good trails for hiking and moutain biking.

Great place to take the kids. The hike down and back is mild. Maybe 6 switchbacks and 1.2k elevation. I highly recommend it, for nice Sunday jaunt.

Its a nice natural preserved area. I think this is the best time to visit. Nice, quiet and calm, peaceful place. There is a trail that goes down into the valley. I recommend carrying enough water while hiking and two people or group would be even better

Resting place halfway point for motorcycle ride. It looks interesting around the parking lot but with COVID-19 restrictions active we just sat on our bikes wearing masks. Will come back later to scout around. Fun ride.

Great place for hikes with rewarding views. My favorite hike starts at Bald Mountain parking lot and leads all the way to the top of Mt. Umunhum (3.7 miles one-way).

Amazing experience.the hike was a great workout. Great place for family and couples to enjoy a refreshing air. Bathrooms are available but a little dirty which is fine. Enjoy it all

They did a very good job of making this place accessible. The views are incredible. But I would have liked to see the old radar tower from the inside.

Worth going up. Roads are very windy so be aware.

Beautiful. I went to Mount Umunhum with my family and there was snow! We had a ton of fun.

The view was spectacular. Hiking trails were fairly shady.

Beutiful views, well maintained, and nice long hikes.

Absolutely gorgeous! Especially, after it snowss!!

Well maintained trails, and a pretty gentle grade; scenic; not crowded; great view at the top.

We walked through the preserve on our way to the top of Mt Umunhum. Some great trails offering a challenging reward for those of us who havent hiked in a while. Bring some liquids and a bag lunch to enjoy up at the top. Not looking to make it to the top? Enjoy some of the other trails.

Very scenic with a lovely view. I was crazy enough to unicycle down which was great fun until I had to half walk - half ride back up as the incline was decently steep — less fun but a fantastic workout nonetheless. An excellent trail for both a stroll for the view or a jog.

Nice view and hike. Lots of stairs though.

Positively stunning and very few people

Great views good hiking trails

Gorgeous drive, easy hike at the end with wonderful views.

Great place for a mountain bike ride. Some incredible stream crossings.

Slow windy road up. Clouds and very chilly at the top when we went on Chistmas day. Gave it a cold Christmas day feel. Great views in areas that were clear of clouds. We walked a small trail that led to a beautiful view.

Well maintained trail. Lots of shade, but still plenty of opportunities for great views of the valley.

The scene is quite beautiful. In the summer time it is still has a lot of green trees. Its in contrast to other mountains in the area. Its good for taking photos but the isnt other activities along the path on the way up.

I had a lot of fun there. There is only one set of bathrooms in the bottom parking lot area. I did not notice any garbage cans around so you must pack out your trash bring water as I did not notice any water fountains either. The views are beautiful and the air has a great smell to it. It was not very crowded today in fact I had the whole Mountain to myself for a short time. I would definitely recommend packing a lunch and bring plenty of cold beverages so you can spend some time there and really enjoy the views.

Great climb on Kennedy hill to woods trail and somboroso mt. You can get all the way to my Umunhum as well

What a lovely drive up the mountain. The view was spectacular. So glad the community fought hard to save this monument to The Cold War period of our local history!

The best hiking have done in a while. We hike 7.4 miles.

Great place if you want to hike or ride MTB with multiple trails.

Sierra Azul has many entrances. I begin at kennedy/top of the hill roads in Los gatos. I have a private parking spot of my own (just kidding!!) across from the parks parking area which os limited parking. Its a great place for a hike to the top (4.1 mi. of steep hills one way but once i hiked 14 mi to limekiln and priest returning back). My biggest complaint is the speed the bikers go...way too fast. I always give them the right of way or else I will get run over. Dogs should be on leash but theyre not. I wish people would obey park rules. People can be so rude. Sigh... Its one of my favorite places; I go quite often even in the heat... A very very nice place to get away from noise. Thank you midpen for all these beautiful trails and for keeping us safe!!

Awesome California and Silicon Valley from one of the tops of the Santa Cruz Mountains. Go for the sunset and bring a jacket, its cold up there.

Plenty of running or hiking trails. A lot of them share the trails with mountain bikes. Mostly fire roads very little in the way of single track.

Even on a hot day, like I went on, theres plant of shade which my four legged companion loved. Its kind of a long trail and you get pretty sone good views..... thanks. .....

Fantastic hike with widespread views on this crisp, clearfall day!

Stunning views of the Bay Area. Its a fantastic drive up to the summit if youve got a sporty car.

Excellent preserve to explore with plenty of hiking trails. Mount Umunhum Hike is a flattish trail with moderate difficulty level. Takes about 4 hours for the 8 mile round trip home from parting lot.Parking lots open at 7 am and are automatically operated.

We could see San Francisco in one direction and all the way to the Monterey Peninsula in the other! So beautiful!

Nice park. Great views of the entire valley. The work on bringing the top of the mountain to its old state is very impressive.

Most the trails are roads and the most interesting area, Mt Umunhum is closed off for construction. It should improve in a couple of years.

One single point you can see santa Cruz, monetary, San Jose, San Francisco, Oakland and Sierra Nevada (yoce)

Hiked up Mt. Umunhum from midpoint on Mt. Umunhum Rd....7 miles round trip.

Good description for the old radar at the summit

Nice workout to the top and back. Took about 3 hours total with us really taking our time and enjoying the view from the top. It gets hot in the direct sun, so be sure to wear sunscreen and bring lots of water!

Hiked from Kennedy Rd trail head to Mount Um. Trail conditions were good. It is a rigorous 15 miles (one way) with appreciable elevation gain. Bring snacks and a lot of water. It is fairly exposed for much of the trail until Woods and the Mt Um portion of the trail. Spectacular views along the way. If you dont want to hike all the way to Um, you can join Priest Rock or Lime Kiln trails or just hike up to the top where Priest Rock intersects and back (from Kennedy). Lots of options. You can hike from Alma Bridge road as well. Hike as long or short as you like. Bikes share the trails. One of my favorite local trail system.

Having been a regular at nearby Almaden Quicksilver Park and other parts of the Sierra Azul open space preserve for years, I was excited to finally get to the top of Mt. Umunhum, and the hiking and views are truly unique in this area. The former base has freshly built day facilities and a lot of area that is in the process of restoration to its natural state.Going to to Umunhum is a long drive up a narrow mountain road with no facilities - prepare properly with a full tank of gas, snacks and water. Today was opening day Sunday, and there was a fair amount of traffic, cars, motorcycles, cyclists, trucks, etc, so keep that in mind as well.But the trip is completely worth it - few areas are both as close to the valley as well as topping 3400 ft, and on a clear day, we could see Santa Cruz, Big Basin, Mt. Tamalpias, Mt. Hamilton, and Morgan Hill, just with a short walk around the top of the mountain.One last note, the Rangers on duty today were super-friendly, doing their best to mitigate the huge crowds on the road, and offering advice on how to best enjoy our visit.

Great place for a day hike!

We did a hike here, very nice experience! Beautiful views and shady road towards the building on the top.

Whether you’re hiking, biking or just seeing the sights, this open space offers great views of the South Bay and Santa Cruz mountains with endless miles of challenging fire roads and trails with steep climbs and lots of sunshine. Make sure to bring a good hat and sunscreen.

Great park at the foot of Mt Umunhum. Parking is iffy

Beautiful way to spend an afternoon. Not much parking at the top. Wheelchair accessible.

Really cool place with excellent views of both the valley and ocean. It was interesting to learn about the history of the Giant Box on top of the mountain.

Good hiking overgrown today nice and groomed trail

Probably the most beautiful hike youll see in the Santa Clara Valley

The newly opened Mount Umunhum is great! You can either take the Ridge Trail or drive up all the way to reach the summit.

Nice place to go for hiking.... and great view at the top.

Nice hike, nice views of the bay

Fire road tail with challenging climbs. Really spectacular view of the bay at the the crest.

We were at the mount. Umunhum old radar station. Highly recommendThe view there was fantastic. We could see all the way to the Pacific Ocean from thereThere is a hiking trail right next to the radar station. We did about 40 minute hike round trip there. I liked a lot for the followings:1 some sections are shady, some are open with great views2 views are great due to its relatively higher altitude3 the trail was relatively new, not that crowded compared with other popular county park hiking trailsDogs are not allowed near the radar station area

Woods Trail, great for trail running. The 3.7 mile from Bald Mountain parking to the top of Mount Umunhum is epic.

Great view!

Great weather for a hike today. Not to hot not to cold. I personally like places with less traffic than I encountered today but good hike nonetheless.

It is the big concrete cube on top of the mountain. Great views

Great ride followed by 360 views of the Bay and ocean.

Very nice place to hike or bike at. New ready for some nice elevation changes.

Wonderful landscape the snow all looks beautiful

Great hike up to the old radar installation. Ive seen from the valley my whole life and Ive got to admit, the view looking down is better than the one looking up. :-)

Great hike. There are different starting points for different levels of hikers.

Good for a walk in the woods! Watch out for poison oak....

Beautiful views, quiet, serene. Bring snacks and enjoy a little picnic

Love it here. Very peaceful

I received a ticket here for hiking after hours :( I thought I could make it back to the lot by sunset. That doesnt change my 5-star review though because its a beautiful place with well-maintained trails! The rangers were kind, concerned for safety of hikers, and educated me for future trips.

Looks great from the air! (This shows up on my review list because I fly over it on approach to SJC)

Awesome place to hike

Very nice shaded and not so steep hike with some history of 1980 radars on top. Beautiful views of bay area.

Gorgeous views, genuinely interesting information placards at the viewing deck also.Tough bike ride to the summit but a bunch of parking is youre that way inclined.

I ran over 30 miles worth if trails in this park, and they are challenging, but beautiful. Wide, well groomed trails with a balance between exposed sections with impressive views and shaded sections for some relief from the sun.

Great mountain biking trails. Steep though...

Really very good hike of 17 miles from woods trail to Barlow road to mt umunhum trail. With elevation gain of 2576 feet. Gradual grade... Not too steep. Good shade across. Just the endurance to take care of 17+ miles.

Good hiking place! Well shaded. No pets. Running strollers are fine. 3, 7, 9 or more miles hike option. A lot bikers. Nice view. Be proud of the bay.

Wonderful hike up Mt. Umunhum from the upper parking lot!

Great facility and fun trail up to Mt. Umunhum. I lived here for so long so it was awesome to see it get developed for hiking and biking.Probably better to hike the trail on a hot day - most of the trail is shaded and on the north side of the ridge.

Beautiful open area to explore and enjoy. Really nice early in the mornings, before all of the cyclists get there. Or, alternatively, late at night. Only issue with that is the view isnt as good!

Melt aluminum open to the public over the weekend. The opening was an amazing experience and the views are spectacular. I recommend that people go up there and travel through the town of new Almaden on their way up the mountain. It is worth the trip, and the hiking trails range from very easy to moderate

Great place to hike and the peak is a really nice to get a great view of the valley.

Enjoy hiking! Long trip, a half day or full day.

Ive youre looking for a cardio workout, look no further. Take the trail opposite LGRC and start the ascent. If and when you get to the top of the main trail, you can go another mile and drop back out the lower Lime Kiln trail. If your a hardy sort, go right at the cross roads and go up till you meet the top of the Kennedy trail. Its a truly religious expirience coming down. 13-16 mile loop that will kick most folks rumps. Ive done all of it on foot and MB. The hiking part give you much more time to examine the different flora in the area. Every season is a bit different in terms of wildflowers. Carry water, there are stream crossings but I dont trust the surface water. Too many deer and such. If you go in the summer, go early. It can be a roaster up there!

Beautiful place for a short hike !

My go-to hiking area. Used to be my main mountain biking area as well. Some good steep sections to get the pumping. Shortest loop is about 5 miles. Stays muddy for a number of days after rain

Sierra Azul is a convenient parking spot to check out mt. Umunhum. Theres a parking spot further down if you want to hike more. The view is fantastic for silicon Valley, theres restrooms there, thank goodness. The building people come to see isnt yet open to the public.

Beautiful views of my hometown of San Jose

The Mt Umunhum trail is fantastic, easy, scenic and appropriate for children. The views from the top are terrific, especially of San Jose. The restrooms are new and clean, and the top viewing areas are ADA compliant. We had a great time but beware, it was about 20 degrees colder at the top than in the city.