I signed up for the Triple Bypass ride again (hope I get in!) and was thinking about the list of notable and interesting Colorado endurance events. Some examples:

Triple Bypass

Boulder Ironman 70.3

Super Longs (human powered from Boulder to Longs Peak and back)

Rocky Mountain National Park Trail Marathon

Where The Sidewalk Ends

Leadville 100 Mountain Bike Ride

An Unsanctioned Racing Ironman Boulder.

What are yours? If I get into the Triple, I will be training in Colorado for the summer for 6-7 bigger events like these for a summer to remember.