Reakirt's Copper flies from late June to early September, depending on elevation and the snow cover of the previous winter. There is only one generation each year. Pratt and Ballmer (1986) established Vaccinium caespitosum as the larval foodplant for Reakirt's Copper in northern California. In Burns Bog, BC, on 22-23 July 1991, four eggs were observed being laid on Vaccinium uliginosum, five on
V. oxycoccus, and two on Andromeda polifolia, all of which are in the family Ericaceae (Richard Beard, pers. comm.).