Colias hecla, the northern clouded yellow or hecla sulphur, is a butterfly in the Pieridae family. In Europe, it is found in the northern part of Norway, Sweden and Finland up to heights of 900 m. It is also found in Greenland, Alaska, the Northwest Territories, Yukon, Quebec, Labrador, Manitoba, the Chukot region, eastern Chukotka, and the Far East. The wingspan is 36–46 mm. The butterfly flies in June to August depending on the location.