Oak Knoll Trail & Summit Trail is a 5.7-mile out-and-back in Mount Diablo State Park near Rock City, CA. It climbs 1,759 ft, with sections as steep as 19% grade. It scores 73/100 on the Ambleway Wildness scale: backcountry feel.
Elevation
0 mi2,300 – 3,694 ft · steepest grade: 19%5.9 mi
Getting there
Trailhead: Summit Trail 37.88085, -121.91792
Nearest town Rock City, CA
Directions
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Oak Knoll Trail & Summit Trail
5.7 mi · ▲ 1,759 ft · 2 hr 47 min
Elevation 2,300–3,696 ft
Out & Back · Mount Diablo State Park
Trailhead: Summit Trail · 37.88085, -121.91792
Weather Aug 3: Clear, high 88°F / low 71° · precip 0% · wind 7 mph · sunrise 6:13 AM · sunset 8:16 PM
Toilets at the trailhead · Drinking water at the trailhead · Parking lot at the trailhead
- Start on Summit Trail, heading SE.
- 1.1 miTurn left, heading NE.
- 50 ftContinue straight onto Green Ranch Road, heading NE.
- 0.5 miTurn right onto Oak Knoll Trail, heading S.
- 0.6 miSharp right, heading SW.
- 0.1 miBear left onto Juniper Trail, heading NW.
- 50 ftTurn left onto Summit Trail, heading NW.
- 0.5 miReach Summit Trail, then turn around and head back the way you came.
- 0.5 miTurn right onto Juniper Trail, heading N.
- 50 ftBear right onto Summit Trail, heading N.
- 0.1 miSharp left onto Oak Knoll Trail, heading N.
- 0.6 miTurn left onto Green Ranch Road, heading NE.
- 0.5 miTurn right onto Summit Trail, heading W.
- 1.1 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
47% dirt18% gravel35% unspecified
Weather
ClearTemperature 88°F71°
Precip0%Wind7 mphUV8Humidity20%
Hourly temperature
90°70°
Sunrise 6:13 AM12 AM3 AM9 AM12 PM3 PM6 PMSunset 8:16 PM
Tue
82°67°
Wed
84°50°
Thu
91°47°
Fri
95°53°
Sat
95°51°
Sun
95°49°
Sunset
The best sunset spot on this hike is 2.7 mi in (~72 min). Leave by 6:44 PM for the 8:16 PM sunset. Back at your car by 10:19 PM, after dark — bring a headlamp. Car visible from the viewpoint
Good to know
- Toilets at the trailhead
- Drinking water at the trailhead
- Parking lot at the trailhead
Other ways to reach this destination
More from Summit Trail Trailhead
- Juniper Viewpoint & Juniper Trail 2 mi · ▲ 705 ft
- Green Ranch Road 2.2 mi · ▲ 740 ft
- Oak Knoll Trail & Summit Trail via Green Ranch Road 4.5 mi · ▲ 1,276 ft
- Green Ranch Road & Summit Trail 4.9 mi · ▲ 1,553 ft
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