Are you ready for the challenge!?

The legendary "Race Across The Sky" 100-mile Run is where it all started 29 years ago.

This race is 50 miles out and 50 miles back in the midst of the Colorado Rockies. Low point is 9,200 feet; the high point is Hope Pass at 12,600 feet. A majority is on forest trails with some mountain roads.

Pacers are allowed after the 50-mile point. This race is supplied with enthusiastic volunteers at 11 well-supplied aid stations with time cut-offs along the course.