Frosted elfin
Callophrys irus
Butterfly
The frosted elfin is a small hairstreak of dry, open habitats where its caterpillars specialize on wild lupines and wild indigos. Adults fly early, close to the bloom of their hosts, and colonies can disappear when lupine or Baptisia patches are shaded out, mowed at the wrong time, or fragmented. In gardens, this is a host-patch butterfly: a few nectar flowers help, but larval Lupinus or Baptisia is the essential support.
Conservation
Often local and declining where open barrens, savannas, and right-of-way host patches are lost or overgrown. Some states treat it as rare or of conservation concern, but status varies by jurisdiction.
Plants in the catalog
Larval host plants · 2
The Lady Bird Johnson Wildflower Center documents wild lupine as a larval host for the Frosted Elfin, and the butterfly depends on lupine or wild-indigo host patches.
NC State lists frosted elfin (Callophrys irus) among the documented Lepidoptera larvae hosted by blue false indigo.
Range
Local colonies across eastern and central North America where wild lupine or wild indigo host patches persist.
Sources & citations
Cite this page
Use this citation for the Plotwright wildlife page. The source cards below show the upstream references behind the taxonomy, range, conservation, host, forage, and habitat claims.
Plotwright. (n.d.). Frosted elfin (Callophrys irus). Retrieved 2026, June 27, from https://plotwright.com/wildlife/callophrys-irus
Sources for wildlife facts
7 cited fact fields are backed by the source cards below.
BAMONA: Frosted Elfin Callophrys irus
Species profile used for range, flight season, and larval-host relationship with lupines and wild indigos.
Backs 4 fields
Taxonomy
Range
Lifecycle
Host plants
Xerces Society: Frosted elfin
Conservation context for host-patch dependency and habitat threats.
Backs 3 fields
Conservation status
Host plants
Garden habitat