Lying near the northern extreme of Sunol Regional Wilderness is a massif known as Maguire Peaks. Rising up to an elevation of just under 1700 feet, this mountain is by no means the highest in the region. In fact, it is nearly a thousand feet lower than the peaks of Mission Ridge which lay 3 to 4 miles to the southwest and more than 2,000 feet lower than the Alameda County highpoints of Discovery, Rose, and “Challenger” Peaks about 8 or 9 miles to the southeast. But the mountain is visible from many local viewpoints and it is easily recognized by its double summit and the precipitous rock bands that encircle it at various elevations.
Maguire Peaks from the Cave Rocks Trail in Sunol Wilderness.
A view from Flag Hill in Sunol Regional Wilderness.
Mount Allison (left) and Mission Peak from the west summit.
Despite its relatively low elevation, the views from the top are extraordinary. A surprisingly vast area of the eastern Bay Area can be seen to the north including the Livermore Valley and the Concord region- both areas dominated by massive Mount Diablo. To the northwest, distant Mount Tamalpais is seen as well as parts of San Francisco. I was surprised to see the tops of the Coyote Hills and part of the San Francisco Bay itself beyond the top of the Mission Grade to the west. Far below is the town of Sunol and the nearby water treatment ponds as well as San Antonio Reservoir. Looking in southerly directions, the view isn't quite as extensive due to the close proximity of higher ridges and peaks. That, however, doesn't diminish the quality of the view. A great perspective can be had of the peaks of Mission Ridge to the southwest: Mission Peak, Mount Allison, and Monument Peak. To the southeast the distant highpoints of Alameda County are visible as well as the higher ridges of Sunol Regional Wilderness. Well to the south is Loma Prieta and the Sierra Azul.
Looking north from the west summit.
A curious deer near a picnic kiosk along Hayfield Road in Sunol Wilderness.
South across Sunol Wilderness from the west summit.
Other distinguishing features of this mountain are its relative isolation and rugged 'mountain-like' appearance. This is not merely a couple of bumps along a high ridge. This mountain stands alone and reigns over several well defined ridges that tend to radiate away from its double summit. Many of these ridges are characterized by tiers of rocky cliff bands that can be somewhat challenging- especially for those attempting the mountain from the east.
The east summit from the west summit.
West summit framed by trees from the Maguire Peaks Trail.
Despite its appearance of having twin summits, there is a significant difference in elevation between the two peaks. The higher western summit rises a good 40 feet or more above the eastern summit. Both peaks rise about 120 to 140 feet above the saddle that separates them. Maguire Peaks has a respectable prominence of about 500 feet and is included in the CC list of peaks.
The easiest routes to Maguire Peaks start from Welch Creek Road just east of Calaveras Road. (Note: A permit is required for parking along Welch Creek Road. See the “Red Tape” section below.)
From Interstate 680 (North or South):
Take the Calaveras Road Exit. Follow the signs for Calaveras Road and continue south along it for about 3.75 miles to Welch Creek Road which is on the left (east). Follow Welch Creek Road for about 0.72 miles to the trailhead for the Lower Maguire Peaks Trail or 1.6 miles to the Upper Maguire Peaks Trail.
A longer, but highly enjoyable approach to Maguire Peaks can be made from the main Sunol Regional Park headquarters at the end of Geary Road. Follow the directions above to Welch Creek Road, but stay on Calaveras Road for another 0.6 miles to Geary Road (A total of 4.2 miles from I-680). Turn left and continue to the end of the road about 1.85 miles from Calaveras Road. There is plenty of parking in several lots near the trailhead.
Maguire Peaks is encircled by a very scenic trail called the Maguire Peaks Loop Trail. This trail- about 3.1 miles in length- accesses all of the several routes to the summits of the peak. Reaching the Maguire Peaks Loop Trail (MPLT) is trivial from any one of the 3 trails that start from Welch Creek Road.
For comparison purposes, here is a list of the different approaches (see map). The distances and elevations cited assume that one is climbing the higher west peak via the popular use trail up the SW ridge (see “Routes” below), but there are countless other alternatives that could lengthen or shorten your climb.
Approaches to Maguire Peaks
Some trails have formidable trail markers.
Lower Maguire Peaks Trail: About 1.75 miles from the trailhead to the summit with an approximate elevation gain of 1100 feet. No significant elevation gains on the return.
This seems to be the shortest and most popular route.
Mission Peak from the Lower Maguire Peaks Trail
West summit from Lower Maguire Peaks Trail.
Trail junction of Maguire Peaks Loop Trail and Lower Maguire Peaks Trail.
Maguire Peaks Trail: About 2.5 miles from the trailhead to the summit with an elevation gain of about 1200 feet and a gain of about 240 feet on the return.
A low ridge lying between Welch Creek Road and the MPLT must be crossed both on the approach and on the return.
Welch Creek Road near the Maguire Peaks Trail trailhead.
Sunol Wilderness has some beautifully constructed trail signs. This one is near Welch Creek Road.
The lower part of the Maguire Peaks Trail.
Vultures on the Maguire Peaks Trail.
Upper Maguire Peaks Trail: About 2.4 miles from the trailhead to the summit with an approximate elevation gain of about 1,060 feet and a gain of about 240 feet on the return.
A higher starting point, but the same low ridge lying between Welch Creek Road and the MPLT must be crossed both on the approach and on the return.
Trail Marker at junction of Maguire Peaks Trail with Upper Maguire Peaks Trail.
Hiking from the main park headquarters is much longer, but very scenic and enjoyable.
Via Hayfield Road, High Valley Road and the Maguire Peaks Trail: About 4.25 miles to the summit with an elevation gain of about 1880 feet and a 320 foot gain on the return.
A high ridge between park headquarters and Welch Creek Road must be crossed both on the approach and on the return. These crossings are in addition to the ridge crossings described in the Maguire Peaks Trail above.
Bridge across Alameda Creek at the Sunol Wilderness headquarters.
Windmill along Hayfield Road
More happy cows.
Old barn along Hayfield Road.
There are any number of routes to the summits of Maguire Peaks. All of them start from somewhere along Maguire Peaks Loop Trail and they range in difficulty from class 1 use trails to steep grassy slopes with a possibility of rock scrambles here and there- perhaps up to class 5.
Steep slope on the southwest side.
Rocky cliffs on south side of the west summit.
Old anchor bolt on east summit.
SW Ridge: The easiest route to the higher west summit seems to be a use trail that starts on the north side of the southwest ridge from the Maguire Peaks Loop Trail (see map). Follow the MPLT west and then north as it crosses over the SW ridge of the peak. North of the ridge, it veers to the east and widens significantly. Look for the start of the trail at the SE side of the widened section (see photo). This trail is clearly visible in satellite views of the peak.
The beginning of the SW Ridge use trail.
Looking east along the southwest ridge.
Both summits visible from high on the SW ridge.
Approaching the west summit.
NW Ridge: Another well defined use trail appears to ascend the north side of this ridge to its crest and then follows the latter to the peak. This use trail starts about 0.7 miles along the MPLT beyond the start of the SW Ridge route and is also quite visible in the satellite view.
A couple of hikers on the northwest ridge.
SE Ridge: There are several routes up to the east summit as well. Those who follow the SE ridge will encounter several false summits and a few cliff bands. Most of the cliffs are class 3 scrambles. All can be bypassed if desired- usually to the south, but not without a certain amount of steep sidehilling through steep grass and brush.
From the Maguire Peaks Loop Trail the beginning of the SE ridge.
East peak from one of the several false summits along the southeast ridge.
East slope of the east summit.
Looking back down the SE ridge from the top of the east summit.
Summit to Summit: Traversing the saddle from one summit to the other is fairly straight forward except for a steep east facing cliff band on the west peak just above the saddle. This has been reported to be an easy class 3 scramble. (Thank you, Bob Burd.)
Looking at the higher west summit from the east summit.
When To Climb
Winter and spring are always choice times to hike in the hills of Northern California. Temperatures are usually mild and comfortable for hiking. The grass is short and easy to walk through without picking up those annoying burrs and stickers that like to stick to exposed hiking socks.
And then there are those spring flowers... !
California Golden Poppies
Flower display on west peak.
South facing slope of SE ridge.
A permit is required for parking at any of the trailheads along Welch Creek Road. Permits are obtainable at the entrance kiosk or the Visitors Center in the main part of the park at the end of Geary Road. There is no fee charged for these permits.
A per vehicle fee of $5.00 is charged for all park visitors.
Camping is not allowed in the vicinity of Maguire Peaks. Sunol Regional Wilderness has family campgrounds near the park headquarters, but they are presently closed until further notice- probably until 2017- due to the Calaveras Dam Replacement Project.
Maguire Peaks is named for an Irish farmer named Peter Maguire who settled in the region during the 1870s. (Alameda County Place Names by Page Mosier and Dan Mosier)
Old picture I took from Mission Peak in 1980.
Me hiking to Maguire Peaks in 2013.
A couple of fine trip reports complete with excellent pictures; well worth checking out: