Mount Umunhum, California, United States

4.5 (44 reviews) Spent 2-3 hours Ranking #24 in San Jose Mountains

Tourists and locals must visit

Awesome trail. absolutely nothing challenging. slight gradient and wide well-groomed trail all the way up. perhaps rated moderate simply for the length? This trail is a geologic wonderland. And once you get to the top, there is so much awesome cold war history. 98% of this hike is under tree cover of some sort. the summit exposed. the trail redirects at the summit parking lot to a brand new staircase. I only saw two bicycles and they were very slow. Sketchy mobile phone service most of the way up the trail. nice bathrooms at the trailhead and at the summit.
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, San Jose, California, United States, Postal Code: 95120.


Current local date and time now

Sunday, March 03, 2024, 1:13

User Ratings

4.5 based on (44 reviews)



  • 5Crockett730 5:00 PM Jun 11, 2021
    Views, views, & more views! Bring Binoculars!
    Ideally, go on a cloudless and clear day when the winds have cleared out the Santa Clara Valley and beyond. You can see downtown San Fran, Mt Tamalpais, Monterey Bay, Mt Hamilton and beyond. Bring binoculars. I'd recommend driving the "New Almaden" route past La Foret & the older St Anthony's Church. Easier/better Road, shorter, prettier drive versus taking Hicks Rd off of Camden. Picnic and hiking. Enjoy!

  • 4Michael K 5:00 PM Aug 27, 2020
    Good views if it is not too hazy
    The summit of Mount Umunhum is dominated by a radar tower that is easily recognizable in San Jose. After you have negotiated the windy road to get to the parking lot with plentiful parking, you can either hike a short pleasant 0.3 mile uphill trail along the side of the mountain, or you can walk up about 160 steps to the upper level where the radar tower is. The radar tower is just a big 85-foot tall faceless concrete cube. It is currently undergoing repair as its condition is deteriorating. So the areas around the building has been cordoned off for maintenance work making it unsightly looking. At observation points along the upper level you can see downtown San Jose and areas further north and Lick Observatory atop Mount Hamilton depending on how hazy it is. The bluish haze does create a colorful picture during sunset where it transitions from layers of blue to magenta to red and to yellow.