Gray Hairstreak
Strymon melinus
The Gray Hairstreak is one of the most widespread butterflies in the continental United States, but is uncommon in Wisconsin. In Butterflies of Illinois, Bouseman and Sternburg consider it rare and uncommon in northern Illinois, “where it may not survive the winter.” This certainly seems to be the case in Wisconsin, where the Gray Hairstreak seems to show up only occasionally, and may form a temporary colony if the push northward occurs early enough in the year.

Weekly sightings for Gray Hairstreak
Identifying characteristics
Below, the Gray Hairstreak has a very gray background color, two orange spots capped with black on the hindwing, and a postmedian line on the hindwing that is tri-colored, with red, black, and white bands from the inside to the outside of the wing. Although other Hairstreaks in Wisconsin rarely land with their wings open, the Gray Hairstreak is an exception and will often be seen with its wings spread.
Similar species
None in Wisconsin.
Habitat
Found in a large variety of open habitats, including open weedy fields.
Flight
This species has been found in late April and into October in Michigan. Individuals that enter Wisconsin early in the year may form a temporary colony and have a second brood. It is not likely that this generation can survive the Wisconsin winter.
Abundance
Uncommon, but could be found almost anywhere in the State.
Late Gray Hairstreak Sightings
Date | County | Reported by |
---|---|---|
Oct 16, 2019 | Dane | Judy Cardin |
Oct 16, 2010 | Wood | Ron Arnold |
Oct 17, 2010 | Marquette | Dan Sonnenberg |
Oct 18, 2017 | Marquette | Dan Sonnenberg |
Oct 24, 2012 | Marquette | Dan Sonnenberg |
Locations



West of Wazee Park, Jackson Co., WI. July 31, 2007.

Rotary Gardens, Janesville, WI. September 28, 2008.

Rotary Gardens, Janesville, WI. September 28, 2008.

Mecan Discovery Center, Marquette Co., WI. September 24, 2006.

Mecan Discovery Center, Marquette Co., WI. September 24, 2006.

Fort Zachary Taylor Historic State Park, Key West, FL. December 30, 2009.