Oak Knoll Trail via Green Ranch Road is a 2.4-mile out-and-back in Mount Diablo State Park near Rock City, CA. It climbs 518 ft, with sections as steep as 21% grade. It scores 78/100 on the Ambleway Wildness scale: genuinely wild.
Elevation
0 mi2,543 – 2,884 ft · steepest grade: 21%2.5 mi
Getting there
Trailhead: Summit Trail 37.87290, -121.92360
Nearest town Rock City, CA
Directions
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Oak Knoll Trail via Green Ranch Road
2.4 mi · ▲ 518 ft · 1 hr 4 min
Elevation 2,541–2,884 ft
Out & Back · Mount Diablo State Park
Trailhead: Summit Trail · 37.87290, -121.92360
Weather Aug 3: Clear, high 92°F / low 74° · precip 0% · wind 7 mph · sunrise 6:13 AM · sunset 8:16 PM
Toilets at the trailhead
- Start at the trailhead, heading NE.
- 50 ftContinue straight onto Green Ranch Road, heading NE.
- 0.5 miTurn right onto Oak Knoll Trail, heading W.
- 0.6 miSharp right, heading NW.
- 0.1 miReach Oak Knoll Trail, then turn around and head back the way you came.
- 0.8 miTurn left onto Green Ranch Road, heading E.
- 0.5 miArrive back at the trailhead.
Each distance is the walk from the previous step. Tap a step for a map of its junction.
Trail surface
39% dirt61% unspecified
Weather
ClearTemperature 92°F74°
Feels like79°Precip0%Wind7 mphUV8Humidity20%
Hourly temperature
95°70°
Sunrise 6:13 AM12 AM3 AM9 AM12 PM3 PM6 PMSunset 8:16 PM
Tue
85°70°
Wed
87°53°
Thu
95°51°
Fri
98°57°
Sat
99°55°
Sun
98°53°
Sunset
The best sunset spot on this hike is right at the trailhead, so there is no walk out. Be there by 7:56 PM to have the sun's last 20 minutes of sky before it sets at 8:16 PM. Your car is right there — dark at 8:45 PM.
Good to know
- Toilets at the trailhead
Other ways to reach this destination
More from Summit Trail Trailhead
- Green Ranch Road 2.9 mi · ▲ 848 ft
Get outside more
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