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Ascent of Zim Zim Ridge on 2017-12-18

Climber: David Sanger

Other People:Solo Ascent
Only Party on Mountain
Date:Monday, December 18, 2017
Ascent Type:Successful Summit Attained
Peak:Zim Zim Ridge
    Location:USA-California
    Elevation:1801 ft / 548 m

Ascent Trip Report

I had originally planned to combine this peak with Peak 1720 across the valley but ran out of time so came back a week later to finish.

The two peaks would make an excellent combo hike, 8-9 miles and a couple of thousand feet. Best is to climb 1801 first; it is easier and you get a good view across the valley to 1720 and can see the direct route from the valley up to the ridge.

For 1801 I parked at the same spot on the Knoxville Berryessa Road and hiked 2 miles out the flat ranch road alongside Zim ZIm Creek. There are 3 creek crossings (plus two more which you can avoid as I did on my return route by taking a shortcut past a curve in the creek). If water is high you'll likely get wet crossing. In December it was just a few hops on stepping stones.

At the two mile make I turned left up an old 4x4 track up the side of the hill. It's shown on the topo and is all there, but is quite overgrown. I clipped what I could of the denser areas, but with GPS you won't miss the trail. At the crest the track cuts right, goes up over a few false summits, then hits the peak. The views as on 1720 are remarkable, long ridges on either side, Blue Ridge to the east and Adams Ridge to the west. You can see south to Lake Berryessa and beyond and north to Saint John Mountain.

The descent was easy but I spent a fair bit of time clipping brush. From the base of the 4x4 track you can continue across Zim ZIm Creek and go up the opposite ridge, staying in the grassy areas and angling east to join the ridgetop where my other track did. Then it is a mile or so north along the ridge through scattered low brush.

The entire hike is public, mostly in the Knoxville Wildlife Area, though the summit of 1801 is on BLM land.

If you go please take register. I forgot and there isn't one there.
Summary Total Data
    Total Elevation Gain:1267 ft / 386 m
    Total Elevation Loss:174 ft / 53 m
    Quality:7 (on a subjective 1-10 scale)
    Route Conditions:
Maintained Trail, Unmaintained Trail, Open Country, Bushwhack, Stream Ford
    Gear Used:
Ski Poles
    Weather:Clear
Ascent Statistics
    Gain on way in:1267 ft / 386 m
        Gain Breakdown:Net: 1093 ft / 333 m; Extra: 174 ft / 53m
    Loss on way in:174 ft / 53 m
    Distance:6.3 mi / 10.1 km
    Route:trail to Zim ZIm Falls, then abandoned jeep trail
    Start Trailhead:Knoxville Berryessa Road  708 ft / 215 m
Descent Statistics
GPS Data for Ascent/Trip


 GPS Waypoints - Hover or click to see name and lat/long
Peaks:  climbed and  unclimbed by David Sanger
Click Here for a Full Screen Map
Note: GPS Tracks may not be accurate, and may not show the best route. Do not follow this route blindly. Conditions change frequently. Use of a GPS unit in the outdoors, even with a pre-loaded track, is no substitute for experience and good judgment. Peakbagger.com accepts NO responsibility or liability from use of this data.

Download this GPS track as a GPX file




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