USA Cycling announced on January 22, 2010, the dates and venues for the 21 events that will comprise the USA Cycling Mountain Bike National Calendars.

In their fourth year, the three calendars will provide professional and elite level athletes with top quality racing opportunities across all disciplines of mountain biking: (1) cross-country, (2) gravity, and (3) ultra-endurance.

Consisting of 10 events in six states, the cross country calendar will kick off with the U.S. Cup Fontana in Fontana, Calif. on March 27 and wrap up on September 6 with the Laddies Loppet Stage Race in Callaway, Minn.

The eight-event gravity calendar will span five states, featuring downhill, 4-cross, super D, and dual slalom competitions. The series begins April 10 with the Santa Ynez Valley Classic in Buelton, Calif. and concludes September 12 with the Whiteface 5th Annual 5k Downhill in Wilmington, New York.

A five-race ultra-endurance calendar will give competitors the chance to duke it out in 12-hour, six-hour, 24-hour, and marathon events, starting with the 12-hours of Santos in Ocala, Fla. on Feb. 20 and ending with the USA Cycling Marathon Mountain Bike National Championships in Breckenridge, Colo. on the Fourth of July.

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