Sulfur Spring–Briones to Mt. Diablo Regional Trail, 6 sights is a 10.6-mile out-and-back in Mount Diablo State Park near Rock City, CA. The route reaches Sulfur Spring at the turnaround, 5.3 miles in. It climbs 2,147 ft, with sections as steep as 25% grade, and is mostly dirt. It scores 80/100 on the Ambleway Wildness scale: genuinely wild.
Elevation
0 mi371 – 1,992 ft · steepest grade: 25%10.8 mi
Getting there
Trailhead: Summit Trail 37.85490, -121.93281
Nearest town Rock City, CA
Directions
AMBLEWAYwww.ambleway.com
Sulfur Spring–Briones to Mt. Diablo Regional Trail, 6 sights
10.6 mi · ▲ 2,147 ft · 4 hr 36 min
Elevation 372–1,993 ft
Out & Back · Mount Diablo State Park
Trailhead: Summit Trail · 37.85490, -121.93281
Weather Aug 3: Clear, high 97°F / low 63° · precip 0% · wind 8 mph · sunrise 6:14 AM · sunset 8:16 PM
- Start on Summit Trail, heading NW.
- 0.3 miSharp left onto Ridge View Trail, heading S.
- 0.3 miSharp right onto Wall Point Road, heading NW.
- 0.6 miTurn left onto Secret Trail, heading W.
- 50 ftTurn right onto Wall Point Road, heading W.
- 2.2 miContinue straight onto Briones to Mt. Diablo Regional Trail, heading NW.
- 0.3 miBear right onto Little Yosemite Valley Trail, heading NW.
- 0.8 miBear left onto Stage Road, heading N.
- 0.9 miReach Sulfur Spring, then turn around and head back the way you came.
- 0.9 miBear right onto Little Yosemite Valley Trail, heading SE.
- 0.8 miBear left onto Briones to Mt. Diablo Regional Trail, heading S.
- 0.3 miContinue straight onto Wall Point Road, heading E.
- 2.2 miTurn left onto Secret Trail, heading NE.
- 50 ftTurn right onto Wall Point Road, heading NE.
- 0.6 miSharp left onto Ridge View Trail, heading E.
- 0.3 miSharp right onto Summit Trail, heading E.
- 0.2 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
85% dirt15% unspecified
Weather
ClearTemperature 97°F63°
Feels like84°Precip0%Wind8 mphUV8Humidity18%
Hourly temperature
100°60°
Sunrise 6:14 AM12 AM3 AM9 AM12 PM3 PM6 PMSunset 8:16 PM
Tue
87°65°
Wed
90°56°
Thu
98°54°
Fri
102°60°
Sat
102°58°
Sun
102°56°
Sunset
The best sunset spot on this hike is 0.3 mi in (~8 min). Leave by 7:48 PM for the 8:16 PM sunset. Back at your car by 8:37 PM — 8 min before dark.
Other ways to reach this destination
More from Summit Trail Trailhead
- Emmons Canyon Trail–Ridge View Trail, 3 sights 5.8 mi · ▲ 1,505 ft
- Misko's Regret–Ridge View Trail, 4 sights 11.6 mi · ▲ 2,567 ft
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