Looks like Greenbrier will be the closest race again this year.

http://www.cyclingnews.com/news/usa-...lenge-calendar

2010 American Mountain Bike Classic Calendar
March 14: Southeastern Regional Championship Series #1 - Gainesville, Florida
March 28: Chickasaw Trace Classic - Columbia, Tennessee
April 10: 17th Annual Barking Spider Bash - Boise, Idaho
April 11: Southeastern Regional Championship Series #3 - Bryson City, North Carolina
April 25: Southeastern Regional Championship Series #4 - Winder, Georgia
April 25: Greenbrier Challenge - Hagerstown, Maryland
May 1-2: The Idyllwild Spring Challenge - Idyllwild, California
May 2: Southeastern Regional Championship Series #5 - Huntsville, Alabama
May 2: Stump Jump - Spartanburg, South Carolina
May 16: Southeastern Regional Championship Series #6 - Ducktown, Tennessee
June 12-13: Southeastern Regional Championship Series #7 - Jackson, Georgia
June 20: Southeastern Regional Championship Series #8 - Clemson, South Carolina
July 3-4: DINO Challenge - North Vernon, Indiana
July 11: 15th Annual Bulldog Rump - Andover, New Jersey
July 11: Southeastern Regional Championship Series #9 - Chattanooga, Tennessee
August 1: Bear Creek Challenge - Macungie, Pennsylvania
August 7-8: Southeastern Regional Championship Series #10 - Fontana, North Carolina
September 3-5: Camp Eagle Classic MTB Festival - Rocksprings, Texas
October 2: Road Apple Rally - Farmington, New Mexico
October 23-24: Piney Hills Classic - Ruston, Louisiana