Colias gigantea, the giant sulphur or giant northern sulfur, is a butterfly in the family Pieridae found in North America. Its range includes Alaska across Canada to the east coast and Wyoming, Montana, and Oregon.Giant Sulphur, Butterflies of Canada
Flight period is from June until early August. It inhabits tundra and willow bogs.
Wingspan is from .
Larvae feed on Salix spp.Colias at Markku Savela's Lepidoptera and Some Other Life Forms Adults feed on flower nectar.
Subspecies Listed alphabetically. C. g. gigantea (Alaska, Alberta, British Columbia, Manitoba, Saskatchewan, Ontario, Yukon, Northwest Territories) C. g. harroweri Klots, 1940 (Wyoming, Montana, Oregon) C. g. mayi F. & R. Chermock, 1940
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