AMBLEWAY Wildest hikes

Rocky Hill Wildlife Sanctuary

Bullfrog Boulder–Ayery Cracks Boulder, 6 rocks

10.2 mi · ▲ 440 ft · 3 hr 37 min

Bullfrog Boulder–Ayery Cracks Boulder, 6 rocks is a 10.2-mile out-and-back in Rocky Hill Wildlife Sanctuary near Groton, MA. The route passes Rock Meadow Pond, Upper Flannagan Pond, Ayery Cracks Boulder and 3 more before reaching Bullfrog Boulder at the turnaround, 5.1 miles in. It climbs 440 ft and is mostly dirt. It scores 26/100 on the Ambleway Wildness scale: green fringe.

Elevation

0 mi240 – 377 ft10.9 mi

Getting there

Trailhead: Unnamed 42.61682, -71.54234
Nearest town Groton, MA
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Directions

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Bullfrog Boulder–Ayery Cracks Boulder, 6 rocks

10.2 mi · ▲ 440 ft · 3 hr 37 min

Elevation 238–378 ft

Out & Back · Rocky Hill Wildlife Sanctuary

Trailhead: 42.61682, -71.54234

Weather Aug 4: Overcast, high 82°F / low 61° · precip 0% · wind 6 mph · sunrise 5:42 AM · sunset 8:04 PM

  1. Start at the trailhead, heading NE.
  2. 0.8 miBear left, heading S.
  3. 450 ftBear left, heading S.
  4. 400 ftBear right, heading S.
  5. 50 ftTurn left, heading S.
  6. 50 ftTurn right, heading S.
  7. 150 ftTurn left, heading SW.
  8. 1.4 miBear right, heading SW.
  9. 150 ftTurn right, heading SW.
  10. 0.2 miBear left, heading W.
  11. 0.4 miSharp left, heading SW.
  12. 0.3 miBear right, heading SE.
  13. 0.7 miTurn right, heading SE.
  14. 0.8 miPass Rock Meadow Pond.
  15. 150 ftSharp left, heading SW.
  16. 0.1 miPass Upper Flannagan Pond.
  17. 150 ftBear right, heading W.
  18. 100 ftTurn right, heading W.
  19. 0.1 miSharp left onto Habitat Loop Trail, heading S.
  20. 250 ftPass Ayery Cracks Boulder.
  21. 250 ftPass A Little Slice of Heaven.
  22. 50 ftPass Blue Blaze Boulder.
  23. 50 ftPass Rock Meadow Pond.
  24. 200 ftReach Bullfrog Boulder, then turn around and head back the way you came.
  25. 0.1 miSharp right, heading NE.
  26. 0.1 miTurn left, heading W.
  27. 100 ftBear left, heading NW.
  28. 0.1 miSharp right, heading SE.
  29. 0.8 miTurn left, heading SE.
  30. 0.7 miBear left, heading N.
  31. 0.3 miSharp right, heading N.
  32. 0.4 miBear right, heading NW.
  33. 0.2 miTurn left, heading NE.
  34. 150 ftBear left, heading NE.
  35. 1.4 miTurn right, heading NE.
  36. 150 ftTurn left, heading N.
  37. 50 ftTurn right, heading N.
  38. 100 ftBear left, heading N.
  39. 400 ftBear right, heading N.
  40. 450 ftBear right, heading N.
  41. 0.8 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/bullfrog-boulder-ayery-cracks-boulder-out-back-6-rocks-17-km

Trail surface

67% dirt33% unspecified

Weather

OvercastTemperature 82°F61°
Precip0%Wind6 mphUV7Humidity82%
Rained 1.1″ yesterday (2.1″ over the last week) · trails may be muddy
Hourly temperature
85°60°
Sunrise 5:42 AM12 AM3 AM9 AM12 PM3 PM6 PMSunset 8:04 PM
Wed 84°63°
Thu 87°70° 31%
Fri 95°71° 31%
Sat 94°68° 33%
Sun 94°68°
Mon 92°72°

Sunset

The best sunset spot on this hike is 3.4 mi in (~87 min). Leave by 6:17 PM for the 8:04 PM sunset. Back at your car by 9:45 PM, after dark — bring a headlamp.

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