This migratory species is widespread in most of Europe, in North Africa, Canary Islands, and in the eastern Palearctic realm (Central Asia, Himalayas, Baluchistan, and Western China). These butterflies live in open areas, in dry lawns, agricultural wastelands and in extensive crops at altitudes between sea level and 2700 m.
This species is present almost throughout the year, with three or four successive generations. The eggs are laid separately on the underside of the leaves of the host plant. The larval cycle is exceptionally short. The pupation takes place among the low vegetation, between a few leaves united by silk. This species may overwinter at all larval stages.
Adults are strong flyers and fly from March to October. The heat-dependent caterpillars feed on Viola species (wild pansy or heartsease (Viola tricolor), field pansy (Viola arvensis), Viola canina, Viola odorata, Viola calcarata, Viola lutea, Viola biflora), lucerne (Medicago sativa), borage (Borago officinalis), Anchusa, Rubus and Onobrychis species.
In the dry regions Issoria lathonia carries out a seasonal vertical migration between hardy evergreen shrubs and small trees of plains and mountain fir pines, where it remains in summer to descend in autumn at low altitude.
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