AMBLEWAY Wildest hikes
Mount Sanitas in Boulder.jpg
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Boulder Open Space and Mountain Parks

Mallory Cave–Viewpoint, 15 sights

13.4 mi · ▲ 4,637 ft · 6 hr 47 min

Mallory Cave–Viewpoint, 15 sights is a 13.4-mile out-and-back in Boulder Open Space and Mountain Parks near Pine Brook Hill, CO. The route passes Maxwell Reservoir and Viewpoint before reaching Mallory Cave at the turnaround, 6.7 miles in. It climbs 4,637 ft, with sections as steep as 38% grade, and is mostly dirt. It scores 2/100 on the Ambleway Wildness scale: paved and peopled.

Elevation

0 mi5,410 – 7,051 ft · steepest grade: 38%15.2 mi

Getting there

Trailhead: Unnamed 40.04094, -105.29328
Nearest town Pine Brook Hill, CO
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Directions

AMBLEWAYwww.ambleway.com

Mallory Cave–Viewpoint, 15 sights

13.4 mi · ▲ 4,637 ft · 6 hr 47 min

Elevation 5,412–7,051 ft

Out & Back · Boulder Open Space and Mountain Parks

Trailhead: 40.04094, -105.29328

Weather Sep 5: Partly cloudy, high 91°F / low 64° · precip 6% · wind 8 mph · sunrise 6:33 AM · sunset 7:30 PM

Parking lot at the trailhead

  1. Start at the trailhead, heading SW.
  2. 50 ftPass Maxwell Reservoir.
  3. 0.5 miBear left onto Goat Path Trail, heading S.
  4. 150 ftContinue straight onto Sanitas Valley Trail, heading SE.
  5. 0.9 miBear right, heading S.
  6. 450 ftSharp left onto Mount Sanitas Trail, heading S.
  7. 250 ftBear right onto Red Rocks Spur Trail, heading SE.
  8. 0.2 miTurn right onto Red Rocks Spur, heading S.
  9. 50 ftTurn left onto Red Rocks Spur Trail, heading S.
  10. 0.2 miTurn left onto Red Rocks Trail, heading SE.
  11. 100 ftSharp right onto The Peoples' Crossing Trail, heading S.
  12. 0.1 miTurn left onto Boulder Creek Path, heading S.
  13. 350 ftBear right, heading SE.
  14. 150 ftBear right, heading SE.
  15. 50 ftTurn right, heading SE.
  16. 350 ftTurn left, heading SW.
  17. 50 ftContinue straight onto Viewpoint Trail, heading SW.
  18. 0.8 miPass Viewpoint.
  19. 250 ftBear left onto Panorama Trail, heading W.
  20. 0.2 miSharp right onto Flagstaff Trail, heading SE.
  21. 0.4 miSharp left onto Crown Rock, heading W.
  22. 0.3 miSharp left onto Gregory Canyon Trail, heading NW.
  23. 500 ftContinue straight onto Saddle Rock Trail, heading NW.
  24. 50 ftContinue straight onto Gregory Canyon Trail, heading S.
  25. 150 ftTurn left onto Bluebell-Baird Trail, heading S.
  26. 0.4 miBear left onto Chautauqua Trail, heading E.
  27. 50 ftContinue straight onto Bluebell-Baird Trail, heading E.
  28. 500 ftTurn right, heading E.
  29. 50 ftTurn right onto Bluebell Road Trail, heading E.
  30. 50 ftTurn left onto Royal Arch Trail, heading E.
  31. 50 ftContinue straight onto Bluebell Road Trail, heading E.
  32. 450 ftTurn right onto Bluebell Hiking Trail, heading SE.
  33. 100 ftSharp right onto Mesa Trail, heading SE.
  34. 0.7 miTurn right onto The Regency climbing access Trail, heading N.
  35. 50 ftBear left onto Mesa Trail, heading NE.
  36. 0.6 miContinue straight onto Mallory Cave Trail, heading S.
  37. 0.5 miTurn left onto Dinosaur Rock, heading SE.
  38. 50 ftSharp right onto Red Devil, heading SE.
  39. 0.4 miReach Mallory Cave, then turn around and head back the way you came.
  40. 0.4 miSharp left onto Dinosaur Rock, heading SW.
  41. 50 ftTurn right onto Mallory Cave Trail, heading SW.
  42. 0.5 miContinue straight onto Mesa Trail, heading W.
  43. 0.5 miBear right onto The Regency climbing access Trail, heading SW.
  44. 50 ftTurn left onto Mesa Trail, heading SW.
  45. 0.7 miSharp left onto Bluebell Hiking Trail, heading NW.
  46. 150 ftTurn left onto Bluebell Road Trail, heading NW.
  47. 450 ftContinue straight onto Royal Arch Trail, heading NW.
  48. 50 ftTurn right onto Bluebell Road Trail, heading NW.
  49. 50 ftTurn left onto Bluebell-Baird Trail, heading NW.
  50. 50 ftBear right, heading NW.
  51. 0.1 miContinue straight onto Chautauqua Trail, heading NW.
  52. 50 ftBear right onto Bluebell-Baird Trail, heading NW.
  53. 0.4 miTurn right onto Amphitheater Trail, heading N.
  54. 150 ftContinue straight onto Saddle Rock Trail, heading N.
  55. 50 ftContinue straight onto Gregory Canyon Trail, heading N.
  56. 500 ftSharp right onto Crown Rock, heading NW.
  57. 0.3 miSharp right onto Flagstaff Trail, heading NW.
  58. 0.4 miSharp left onto Panorama Trail, heading N.
  59. 0.2 miBear right, heading NW.
  60. 100 ftContinue straight onto Viewpoint Trail, heading NW.
  61. 0.8 miTurn right, heading NE.
  62. 350 ftTurn left, heading E.
  63. 50 ftBear left, heading NE.
  64. 100 ftBear left onto Boulder Creek Path, heading N.
  65. 400 ftTurn right onto The Peoples' Crossing Trail, heading NW.
  66. 0.1 miSharp left onto Red Rocks Trail, heading N.
  67. 150 ftTurn right onto Red Rocks Spur Trail, heading NE.
  68. 0.2 miTurn right onto Red Rocks Spur, heading NE.
  69. 50 ftTurn left onto Red Rocks Spur Trail, heading NE.
  70. 0.2 miBear left onto Mount Sanitas Trail, heading NW.
  71. 250 ftSharp right, heading W.
  72. 450 ftBear left onto Sanitas Valley Trail, heading E.
  73. 0.9 miContinue straight onto Goat Path Trail, heading NE.
  74. 150 ftBear right, heading NE.
  75. 0.3 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/mallory-cave-viewpoint-out-back-15-sights

Trail surface

74% dirt13% gravel4% paved9% unspecified

Weather

Partly cloudyTemperature 91°F64°
Precip6%Wind8 mphUV7Humidity22%
Rained 0.1″ 4 days ago
Hourly temperature
95°60°
Sunrise 6:33 AM12 AM3 AM9 AM12 PM3 PMSunset 7:30 PM
Sat 91°67°
Sun 87°63° 22%
Mon 87°66° 29%
Tue 86°61° 30%
Wed 83°59° 30%
Thu 92°62° 28%

Good to know

  • Parking lot at the trailhead

More from this trailhead

Hikes near Pine Brook Hill, Colorado