Sulfur Spring–Briones to Mt. Diablo Regional Trail, 5 sights is a 10.8-mile out-and-back in Mount Diablo State Park near Rock City, CA. The route reaches Sulfur Spring at the turnaround, 5.4 miles in. It climbs 1,867 ft, with sections as steep as 16% grade, and is mostly dirt. It scores 80/100 on the Ambleway Wildness scale: genuinely wild.
Elevation
0 mi371 – 1,752 ft · steepest grade: 16%11.1 mi
Getting there
Trailhead: Trail Through Time 37.85019, -121.93391
Nearest town Rock City, CA
Directions
AMBLEWAYwww.ambleway.com
Sulfur Spring–Briones to Mt. Diablo Regional Trail, 5 sights
10.8 mi · ▲ 1,867 ft · 4 hr 32 min
Elevation 372–1,752 ft
Out & Back · Mount Diablo State Park
Trailhead: Trail Through Time · 37.85019, -121.93391
Weather Aug 3: Clear, high 97°F / low 63° · precip 0% · wind 8 mph · sunrise 6:14 AM · sunset 8:16 PM
Toilets at the trailhead · Drinking water at the trailhead · Parking lot at the trailhead
- Start on Trail Through Time, heading NW.
- 0.2 miBear left onto Wall Point Road, heading NW.
- 1.1 miTurn left onto Secret Trail, heading NW.
- 50 ftTurn right onto Wall Point Road, heading NW.
- 2.2 miContinue straight onto Briones to Mt. Diablo Regional Trail, heading NW.
- 0.3 miBear right onto Little Yosemite Valley Trail, heading N.
- 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 E.
- 0.8 miBear left onto Briones to Mt. Diablo Regional Trail, heading SW.
- 0.3 miContinue straight onto Wall Point Road, heading E.
- 2.2 miTurn left onto Secret Trail, heading SE.
- 50 ftTurn right onto Wall Point Road, heading SE.
- 1.1 miBear right onto Trail Through Time, heading S.
- 0.1 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
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 0.0 mi in (~1 min). Leave by 7:55 PM for the 8:16 PM sunset. Back at your car by 8:32 PM — 13 min before dark. 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 Trail Through Time Trailhead
- Curry Point & Trail Through Time via Wall Point Road 1.5 mi · ▲ 344 ft
- Holey Rock–Curry Point, 5 sights 4.9 mi · ▲ 1,419 ft
- Curry Point–Black Hawk Ridge Road, 4 sights 5.5 mi · ▲ 1,124 ft
- Emmons Canyon Trail & Trail Through Time via Wall Point Road 6 mi · ▲ 1,225 ft
- Briones to Mt. Diablo Regional Trail–China Wall Road, 3 sights 8.9 mi · ▲ 1,493 ft
- Pine Pond–Dusty Road, 4 sights 9 mi · ▲ 1,703 ft
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