An American Birkebeiner qualifying race, Colorado Cup Series Race AND Crested Butte’s largest costume party, the Alley Loop features a unique course that winds its way through the streets and alleys of downtown CB! The course meanders through snow-lined alleys, behind false-fronted stores and restaurants, over footbridges and alongside residences before heading out to the pristine outskirts of Crested Butte. Great prizes and loads of fun for all ages and abilities!