Sheridan’s Green Hairstreak: Wyoming’s State Butterfly and a Sign of Spring
As winter fades in Wyoming, one of the earliest signs of spring is the arrival of the Sheridan’s Green Hairstreak butterfly, K2 Radio reports.
This small, jade-green insect appears on the first warm days of the season, sometimes even while snow still lingers on the ground. Like the robin, the Green Hairstreak is a seasonal indicator, signaling the return of warmer weather.
The Sheridan’s Green Hairstreak thrives in sagebrush, brushy hills, woodlands, open hillsides, and canyon slopes across Wyoming. It was first documented in 1877 near present-day Sheridan, and interestingly, the butterfly was named before the town. Both were named after Lt. General Philip H. Sheridan, a well-known Civil War commander.
This butterfly is sometimes called “Sheridan’s Elfin”, a nod to its delicate size and enchanting appearance.
In 2009, Wyoming officially designated the Sheridan’s Green Hairstreak as its state butterfly. The idea originated from third-grade students at Big Horn Elementary School in Sheridan County, who proposed the designation as part of a class project. Their initiative led to the creation of the “butterfly bill”, which passed unanimously (30-0) in the Wyoming State Legislature on January 26, 2009.
The bill was sponsored by:
- Senator Bruce Burns (Sheridan County)
- Representative Rosie Berger (Sheridan County)
- Representative Mary Throne (Cheyenne)
University of Wyoming entomology professor Scott Shaw strongly supported the bill and testified before the legislative committee. He emphasized the butterfly’s uniqueness, stating:
“This lovely insect is distinctive, being one of the few green butterflies in our region.”
Beyond its ecological significance, the green butterfly is often associated with symbolism. Some believe that seeing a green butterfly is a message from a loved one who has passed away, offering comfort and connection. Others interpret it as a reminder to trust one’s heart when making important decisions.
