Outer Limits Trail BikingHikingTrail Running

Trail Length
6.7 miles
Distance from Durango
33 miles
628 ft
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Outer Limits Trail

Biking, Hiking, Trail Running
Durango to TH

33 Miles


628 Feet



Trail Length

6.7 Miles

Part of the Alien Run Trail System.

Outer Limits is a 6.7-mile moderate loop within the Alien Run Trail System and is a popular mountain bike ride in the Four Corners area. This loop is accessed from the main Alien Run loop and is slightly more difficult terrain. From Outer Limits, you can re-access the main Alien Run loop and eventually meet back with the parking area.

The three stacked loops of Alien Run offer a variety of riding for everyone. Trails flow through smooth dirt arroyos, traverse along slickrock cliffs, and session through natural technical features.

Map & Directions

Map Coordinates: 36.892273, -107.825403

Where's the Trailhead?


Alien Run Trailhead

From 9th Street and Main Avenue in Durango, head west on 9th Street toward Camino Del Rio. Turn left onto Camino Del Rio/ Hwy 550. After 4.7 miles turn right to stay on Hwy 550, and continue for 25 miles. Before reaching the town of Aztec, NM, turn left onto Road 2651. After 1.8 miles, turn right at an intersection. After 0.6 miles turn left onto another road which will lead to the main trailhead for Alien Run. All of these roads are well service roads that will be messy in wet weather.


help build our trails!

Thursday, September 12 Trailwork

Join us for a weekday trailwork party at [location TBD]. Thank you for volunteering with Trails 2000 at our trailwork party on Thursday, September 12  from 4:30 to 7:30pm!


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