This species of butterfly falls in a subfamily of butterflies known as the blues because …well, the top-side of their wings is blue in color. They are generally one of the first blues seen each year. Females lay their eggs on flower buds of host plants and the larvae feed on the buds and opening flowers. While not well understood, the larvae are tended (protected) by ants and may actually pupate in ant nests. They can be found in the US in the inland northwest and southwest Canada.
Photo by Glenn Marangelo on 3/22/20 in Missoula, MT.