7 miles
1,439 ft
-2,869 ft
Avg time
Trail Supporters, Builders & Maintainers of Portal to Porcupine Trail

Portal to Porcupine Details

  • Riding area
    Big Sky
    Big Sky, Montana
  • Difficulty rating
    Black Diamond
  • Trail type
  • Trail Usage
    Biking Primary
  • Direction
    Downhill Primary
    Popular direction shown
  • Global Ranking

Primitive and often overgrown and rocky. Expect some hike-a-bike, a bit of an adventure ride these days.

Local Trail Association
More Stats for Portal to Porcupine mountain bike trail
  • Altitude change
    -1,430 ft
  • Altitude min
    6,649 ft
  • Altitude max
    9,258 ft
  • Altitude start
    8,079 ft
  • Altitude end
    6,649 ft
  • Grade
  • Grade max
  • Grade min
  • Distance climb
    3 miles
  • Distance down
    4 miles
  • Distance flat
    1,311 ft
  • Avg time
  • view trail stats
Avg: 3 (2 votes)

view (3)
Layers winter
Map Style
Trail Style
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Directions to portal-to-porcupine trailhead (45.257750, -111.127970)
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Portal to Porcupine Trail Reports

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8 |
Jul 20, 2017 @ 1:02pm
Jul 20, 2017
Portal to Porcupine, Bozeman

Trail Products

2 Reviews & Comments

  • + 1
flag kirkwood-mtbiker (Aug 11, 2017 at 5:51)
 Loose as f*#@. A rutted trail from motor bikes. Not worth it on an XC bike.
  • + 0
flag RegCT (Aug 14, 2017 at 12:01)
 Ahh I disagree! A little bit of some gnarly climbing and hike a bike but worth it for the beautiful views and looooong mix of loamy flow and technical descent back to porcupine. This ride is a Big Sky hidden gem. Use backcountry protocols.

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