Chlosyne acastus, the sagebrush checkerspot, is a butterfly of the family Nymphalidae that is found in North America.

They range from western United States east to Nebraska and north to southern Alberta.

[3] The adult's wingspan is 33–44 mm (1.3–1.7 in).

[3] There is one flight that occurs between May and early September in Canada.

[3] The caterpillar of this species feeds on rabbit-brush (Chrysothamnus viscidiflorus) and desert-aster (Machaeranthera species).