FATMAP by Strava

Onza Alley


An old school tech trail that offers a good challenge for upper intermediate and advanced riders.

Mountain Biking Severe

1.1 km
0 m
133 m
0-1 hrs
Low Point
2.6 km
High Point
2.7 km
Onza Alley Map

Unlike PMT, Onza Alley is solidly in the single back diamond range—as long as you don't drop into the uber-gnarly drop on Bailey's Bailout!


Onza Alley falls between two blue trails on the mountain, allowing a faster and slightly more challenging way down when compared to nearby Lion Down. For upper intermediates looking to push the boundary, Onza Alley could be just the ticket.

Vail Mountain describes Onza Alley as "a difficult singletrack with narrow, steep sections over roots and rocks." Forget the flow trail—Onza keeps it old school!

Source: https://www.vail.com/explore-the-resort/activities-and-events/summer-activities/mountain-biking.aspx



Widely variable, narrow trail tread with steeper grades and unavoidable obstacles of 15in/38cm tall or less. Obstacles may include unavoidable bridges 24in/61cm wide or less, large rocks, gravel, difficult root sections, and more. Ideal for advanced-level riders.

Medium Exposure

2 out of 4

The trail contains some obstacles such as outcroppings and rock which could cause injury.


1 out of 4

Close to help in case of emergency.

Best time to visit

between June and September


  • Technical
  • Singletrack
  • In the forest
  • Drops
  • Roots
  • Rock Gardens

Similar routes nearby

Guidebooks in this area