AMBLEWAY Wildest hikes

Mount Diablo State Park

Sentinel Rock–Briones to Mt. Diablo Regional Trail, 3 sights

10.3 mi · ▲ 1,827 ft · 4 hr 21 min

Sentinel Rock–Briones to Mt. Diablo Regional Trail, 3 sights is a 10.3-mile out-and-back in Mount Diablo State Park near Alamo Oaks, CA. The route reaches Sentinel Rock at the turnaround, 5.2 miles in. It climbs 1,827 ft, with sections as steep as 16% grade, and is mostly dirt. It scores 76/100 on the Ambleway Wildness scale: genuinely wild.

Elevation

0 mi532 – 1,752 ft · steepest grade: 16%10.7 mi

Getting there

Trailhead: Unnamed 37.86909, -121.99737
Nearest town Alamo Oaks, CA
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Directions

AMBLEWAYwww.ambleway.com

Sentinel Rock–Briones to Mt. Diablo Regional Trail, 3 sights

10.3 mi · ▲ 1,827 ft · 4 hr 21 min

Elevation 531–1,752 ft

Out & Back · Mount Diablo State Park

Trailhead: 37.86909, -121.99737

Weather Sep 20: sunrise 6:55 AM · sunset 7:10 PM

  1. Start at the trailhead, heading NE.
  2. 0.3 miSharp right, heading E.
  3. 0.3 miTurn right onto Briones to Mt. Diablo Regional Trail, heading S.
  4. 1 miContinue straight onto Wall Point Road, heading SE.
  5. 2.2 miTurn left onto Secret Trail, heading SE.
  6. 50 ftTurn right onto Wall Point Road, heading SE.
  7. 1.1 miBear right onto Trail Through Time, heading S.
  8. 0.2 miTurn left onto CCC Trail, heading S.
  9. 250 ftReach Sentinel Rock, then turn around and head back the way you came.
  10. 250 ftTurn right onto Trail Through Time, heading N.
  11. 0.2 miBear left onto Wall Point Road, heading S.
  12. 1.1 miTurn left onto Secret Trail, heading W.
  13. 50 ftTurn right onto Wall Point Road, heading W.
  14. 2.2 miContinue straight onto Briones to Mt. Diablo Regional Trail, heading S.
  15. 0.3 miBear left, heading NW.
  16. 0.7 miTurn left, heading NW.
  17. 0.3 miSharp left, heading NW.
  18. 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/sentinel-rock-out-back-13-km-acff

Trail surface

85% dirt15% unspecified

Weather

Sunrise 6:55 AMSunset 7:10 PM

Sunset

The best sunset spot on this hike is 0.2 mi in (~10 min). Leave by 6:39 PM for the 7:10 PM sunset. Back at your car by 7:31 PM — 5 min before dark.

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