AMBLEWAY Wildest hikes

Mount Diablo State Park

Holey Rock–Borges Ranch Trail, 7 sights

16.1 mi · ▲ 3,392 ft · 7 hr 4 min

Holey Rock–Borges Ranch Trail, 7 sights is a 16.1-mile out-and-back in Mount Diablo State Park near Alamo, CA. The route reaches Holey Rock at the turnaround, 8.1 miles in. It climbs 3,392 ft, with sections as steep as 27% grade, and is mostly dirt. It scores 76/100 on the Ambleway Wildness scale: genuinely wild.

Elevation

0 mi433 – 1,742 ft · steepest grade: 27%16.7 mi

Getting there

Trailhead: Franco Ridge Loop Trail 37.87530, -122.01516
Nearest town Alamo, CA
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Directions

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Holey Rock–Borges Ranch Trail, 7 sights

16.1 mi · ▲ 3,392 ft · 7 hr 4 min

Elevation 434–1,744 ft

Out & Back · Mount Diablo State Park

Trailhead: Franco Ridge Loop Trail · 37.87530, -122.01516

Weather Aug 3: Mostly clear, high 101°F / low 63° · precip 0% · wind 6 mph · sunrise 6:14 AM · sunset 8:16 PM

  1. Start on Franco Ridge Loop Trail, heading NE.
  2. 0.5 miTurn right onto Sugarloaf-Shell Ridge Trail, heading N.
  3. 0.2 miTurn left onto Foothills Trail, heading E.
  4. 0.2 miContinue straight onto Borges Ranch Trail, heading SE.
  5. 0.3 miBear right onto Briones to Mt. Diablo Regional Trail, heading S.
  6. 1.6 miContinue straight onto Wall Point Road, heading E.
  7. 2.2 miTurn left onto Secret Trail, heading SE.
  8. 50 ftTurn right onto Wall Point Road, heading E.
  9. 1.1 miTurn right onto Summit Trail, heading S.
  10. 0.4 miSharp right onto Deer Trail, heading W.
  11. 0.9 miSharp left onto West Fossil Ridge Road, heading E.
  12. 0.5 miReach Holey Rock, then turn around and head back the way you came.
  13. 0.5 miSharp right onto Deer Trail, heading NW.
  14. 0.9 miSharp left onto Rock City Camp Road, heading E.
  15. 0.4 miTurn left onto Wall Point Road, heading E.
  16. 1.1 miTurn left onto Secret Trail, heading NW.
  17. 50 ftTurn right onto Wall Point Road, heading NW.
  18. 2.2 miContinue straight onto Briones to Mt. Diablo Regional Trail, heading W.
  19. 0.3 miBear left, heading NW.
  20. 1.3 miBear left, heading NW.
  21. 0.1 miBear right, heading NW.
  22. 100 ftContinue straight onto Borges Ranch Trail, heading NW.
  23. 500 ftBear left, heading NW.
  24. 250 ftContinue straight onto Foothills Trail, heading NW.
  25. 0.2 miTurn right onto Sugarloaf-Shell Ridge Trail, heading NW.
  26. 0.2 miTurn left, heading NW.
  27. 0.4 miContinue straight onto Franco Ridge Loop Trail, heading W.
  28. 350 ftArrive 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/franco-pond-franco-pond-out-back-21-km-4eca

Trail surface

81% dirt19% unspecified

Weather

Mostly clearTemperature 101°F63°
Feels like81°Precip0%Wind6 mphUV8Humidity28%
Hourly temperature
105°60°
Sunrise 6:14 AM12 AM3 AM9 AM12 PM3 PM6 PMSunset 8:16 PM
Tue 90°63°
Wed 89°55°
Thu 97°56°
Fri 103°61°
Sat 103°59°
Sun 102°58°

Sunset

The best sunset spot on this hike is 1.6 mi in (~53 min). Leave by 7:03 PM for the 8:16 PM sunset. Back at your car by 9:14 PM, after dark — bring a headlamp.

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