It looks like the four corners region is blowing up with some good old fashioned grassroots endurance racing. Both the Arizona and New Mexico Endurance series have been around for a few years, and now Colorado is jumping on the bandwagon. The Colorado Endurance Series will kick off with the Durango Gravel Grinder 115/160 on April 16. The rest of the series looks to be comprised of various high end singletrack and dirt road centuries. Needless to say when I stumbled across the list of events, my jaw hit the floor, and I started thinking of how I could attend as many of these events as possible. I wonder if I can get ready for 160 miles of riding in two months?