Erigeron alpinus is an herb up to 30 cm (12 in) tall, with spoon-shaped, hairy, medium green leaves. The plants flowers are narrow and have a thread-like ray florets, which are made out of 2 or more rows. In the summer the flower heads have lilac-blue to red-purple ray florets surrounding greenish-yellow disc florets, and are 3.75 cm (1+1⁄2 in) tall.