FATMAP by Strava

Boulder Mason

Crested Butte

A new school tech line that serves as a superb alternate while shredding an Avery lap.

Mountain Biking Severe

353 m
0 m
52 m
0-1 hrs
Low Point
2.9 km
High Point
3 km
Boulder Mason Map

How do you improve on the ripping downhill tech of the classic Avery trail? Why, by building Boulder Mason!


Boulder Mason is one of the newest tech trails in the Evolution Bike Park, and it offers a fantastic alternate line off of the main Avery run. Unlike the old school tech of Avery, Boulder Mason features modern trail building techniques with well-constructed rocky gnar-gnar.

Don’t take “modern trail building” techniques to mean “easy.” Boulder Mason features several committing, steep rock rolls—often between flesh-shredding rock slabs and with abrupt endings that demand constant control.

The modern trail building techniques shine through with multiple line options. Roller lines and drop lines mesh seamlessly, as do straight lines and twisty lines. It’s amazing how many options are present in such a physically narrow trail!

If you bobble the lines through Boulder Mason, don’t worry: there’s always next run!



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.

High Exposure

3 out of 4

Some trail sections have exposed ledges or steep ascents/descents where falling could cause serious injury.


1 out of 4

Close to help in case of emergency.

Best time to visit

between June and September


  • Technical
  • Shuttle-run
  • Singletrack
  • Drops
  • Roots
  • Rock Rolls
  • Rock Slabs
  • Rock Gardens
  • Wooden Feature

Similar routes nearby

Guidebooks in this area