HOUGHTON, MI — Registration has opened for the 2015 U.S. Cross Country Skiing Championships, January 2-10, 2015, at the Michigan Tech Nordic Training Center in Houghton, Michigan. Online registration is available at www.nordicchampionship.org This year’s U.S. championships include four races: a freestyle 10k/15k on Sunday, January 4; a classic sprint on Monday, January 5; the classic distance races on Thursday, January 8; and a freestyle sprint on Saturday, January 10. All races will take place at the Michigan Tech trails.