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Doug Olson · CC BY-SA 3.0
Mount Diablo State Park

Sulfur Spring–Briones to Mt. Diablo Regional Trail, 6 sights

10.6 mi · ▲ 2,147 ft · 4 hr 36 min

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
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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 Sep 20: sunrise 6:55 AM · sunset 7:09 PM

  1. Start on Summit Trail, heading NW.
  2. 0.3 miSharp left onto Ridge View Trail, heading S.
  3. 0.3 miSharp right onto Wall Point Road, heading NW.
  4. 0.6 miTurn left onto Secret Trail, heading W.
  5. 50 ftTurn right onto Wall Point Road, heading W.
  6. 2.2 miContinue straight onto Briones to Mt. Diablo Regional Trail, heading NW.
  7. 0.3 miBear right onto Little Yosemite Valley Trail, heading NW.
  8. 0.8 miBear left onto Stage Road, heading N.
  9. 0.9 miReach Sulfur Spring, then turn around and head back the way you came.
  10. 0.9 miBear right onto Little Yosemite Valley Trail, heading SE.
  11. 0.8 miBear left onto Briones to Mt. Diablo Regional Trail, heading S.
  12. 0.3 miContinue straight onto Wall Point Road, heading E.
  13. 2.2 miTurn left onto Secret Trail, heading NE.
  14. 50 ftTurn right onto Wall Point Road, heading NE.
  15. 0.6 miSharp left onto Ridge View Trail, heading E.
  16. 0.3 miSharp right onto Summit Trail, heading E.
  17. 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 map, photos and weather for this hike: www.ambleway.com/hikes/sulfur-spring-out-back-17-km-a6e9

Trail surface

85% dirt15% unspecified

Weather

Sunrise 6:55 AMSunset 7:09 PM

Sunset

The best sunset spot on this hike is right at the trailhead, so there is no walk out. Be there by 6:49 PM to have the sun's last 20 minutes of sky before it sets at 7:09 PM. Your car is right there — dark at 7:36 PM.

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Other ways to reach this destination

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