The Tartu Marathon is the best known and most popular skiing event of its kind in Estonia. It is held every year on the third Sunday in February and forms part of the international Worldloppet and Estonian Estoloppet cross-country series. The full marathon course through Tartu and Valga counties covers a distance of 63 km, with the shorter route covering 31 km. The marathon is traditionally contested in classic style. Its rules comply with the competition regulations of both the FIS (International Ski Federation) and the ESL (Estonian Ski Association).