The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
In 114 records from GBIF, adults of this species have mostly been collected during July (24%), June (21%), August (18%), May (14%), September (11%), and April (10%).
In 93 records from GBIF, this species has been collected at elevations ranging from 131 to 8914 ft, with an average (median) of 5194 ft.