Here is USA Cycling's 2011 Ultra Endurance schedule:
In its debut year, the Pro UET will feature four events that offer various disciplines of racing for endurance athletes, including 6-hour, 24-hour, marathon, and ultra-marathon contests.
The ultra-endurance series will open with the Spa City Extreme 6-Hour in Hot Springs, Ark on March 12. It will then take a break for three months before a pair of events heat up the month July – the Firecracker 50 in Breckenridge, Colo. on July 4 and the Galena Grinder –in Boise, Idaho on July 23. The Pro UET will conclude on August 21 with the Hampshire 100 in Greenfield, NH.
2011 USA Cycling Pro Mountain Bike Ultra-Endurance Tour (Pro UET)
March 12: Spa City Extreme 6-Hour – Hot Springs, Ark.
July 4: Firecracker 50 – Breckenridge, Colo.
July 23: Galena Grinder – Boise, Idaho
August 21: Hampshire 100 – Greenfield, NH
For more information, visit the USA Cycling Pro UET page.