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Palo Alto to Mount Umunhum

Mount Umunhum, above the valley.

Make Mount Umunhum the one big destination: drive from Palo Alto to summit parking, enjoy the viewpoints and history, then return with daylight to spare.

Plan this drive
Mount Umunhum seen from Jacques Ridge in Sierra Azul Preserve
Photo: Thomson200 · CC0 1.0
Time
Half to full day
Best for
Panoramic views, mountain history and a short summit walk
Road character
South Bay approach, Hicks Road and Mount Umunhum Road

A flexible plan

How to spend the day

  1. 01
    Check

    Choose a day for the view

    Check Midpen road notices and the mountain forecast before leaving. If the summit is in cloud, choose another outing rather than counting on a clear panorama.

  2. 02
    Drive

    Use the signed summit parking area

    Follow the official Hicks Road approach onto Mount Umunhum Road. Drive patiently through the bends and use designated parking; the summit is the destination, not a through route.

  3. 03
    Explore

    Walk the summit paths and read the landscape

    Make time for the viewpoints and interpretive displays about Indigenous history and the former radar station. Keep the visit on public paths and respect the ceremonial space.

  4. 04
    Alternative

    Choose a hiking day instead of a second destination

    For a longer outing, start at Bald Mountain and hike the Mount Umunhum Trail. It is about 3.9 miles each way, so this replaces the short summit visit rather than being an easy extra.

Fuel strategy

Make the fuel stop fit the outing

Compare fuel near Palo Alto or along the South Bay approach before Hicks Road. Arrive with enough fuel or charge for the climb and descent; do not assume summit services.

1

Palo Alto

Start with enough range for the day.

2

South San Jose approach

Use an on-route stop before the mountain road.

3

Summit visit

Plan the climb with reserve range; any refill belongs on the urban approach.

Compare fuel stops for this route

Before you leave

Practical notes

  • The Mount Umunhum area opens at 7 a.m. and closes half an hour after sunset; its entrance gate closes at sunset. Recheck current notices.
  • Dogs are not allowed on Mount Umunhum Road, in its parking areas or at the summit, including dogs in cars; check Midpen’s service-animal policy if applicable.
  • Bring your own water and a wind layer. Download directions and the trail map before climbing.
  • The summit-path visit and the longer trail from Bald Mountain are different plans; select one that fits your group.

Official information

Check the current details

Conditions, reservations and closures can change. These first-party sources should be your final check before departure.

Midpen — Sierra Azul and Mount Umunhum visitor information Mount Umunhum summit access map

Quick answers

What drivers usually ask

Do I have to hike all the way up?

No. When the road is open, drive to summit parking for the shorter visit. Check official accessible-parking and pathway information for mobility needs.

Can I combine this with Castle Rock Falls?

Give each its own day. They use different mountain approaches, and combining them leaves less time for walking and a relaxed return.

See all image sources and licenses.