Measurements of the supercooling points of eggs of the gypsy moth,Lymantria disparL. (Lepidoptera: Lymantriidae), collected in two sites in Quebec, at various levels above the ground, indicate that the species is well able to withstand the Quebec winter. A high percentage of egg masses were laid above snow cover level, but winter mortality was never higher than 39.7%. Winter mortality was, however, positively correlated with the length of exposure to low winter temperatures and to the degree of cold experienced, and these two factors were affected by a protective snow cover.