Size: 1.25 to 1.75 inch wingspan
Key ID features: Above, bands of orange and yellow-orange, separated by black lines and patches. Median band usually lighter. Basal 1/3 of HW above is mostly black with little orange. Below bands of off-white and brick red with black veins and edges. Red spots in postmedian band often longer than in similar species.
Similar species: Northern Checkerspot does not have the large black area on the basal HW above, and below postmedian band spots are generally shorter than in Hoffman's.
Hostplant: Asters, including western showy aster (Eurybia conspicua) and Cascade aster (Eucephalus ledophyllus).
Habitat: Moist montane meadows, canyons, streamsides, clearings in conifer forests.
Range: Cascade Range above 1000 feet.
Season: Early May to early September
Conservation Status: Secure