STATE BUTTERFLY MONARCH BUTTERFLY By No. 73 of the Acts of 1987, effective July 1, 1987, the General Assembly designated the Monarch Butterfly (Danaus plexippus) as the state butterfly. Monarch butterflies are native to Vermont, and they breed here. They are most common in late summer and early autumn. The designation of the Monarch as the state butterfly was first proposed by the 1987 fifth grade class of Mr. Paul Kaplan at Cornwall Elementary School. ------- from Office of the Secretary of State, Vermont Legislative Directory and State Manual, Biennial Session, 1993-1994, p. 22.