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 record. Use the source cards below to explore the references that informed its taxonomy, range, conservation, host plants, foraging, and habitat.
Plotwright. (n.d.). Frosted elfin (Callophrys irus). Retrieved 2026, August 20, from https://plotwright.com/wildlife/callophrys-irus
Sources used for this record
This record is compiled from the sources below.
BAMONA: Frosted Elfin Callophrys irus
Species profile used for range, flight season, and larval-host relationship with lupines and wild indigos.
USFWS: Frosted elfin
Conservation context for host-patch dependency and habitat threats.
GBIF: Thecla irus
GBIF treats Callophrys irus as a synonym and points to the accepted taxon Thecla irus at key 1930660, anchored here.
iNaturalist: Callophrys irus
iNaturalist taxon 198817 is the species Callophrys irus, the frosted elfin, kept in genus Callophrys.