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 32 records from GBIF, adults of this species have been collected during August (50%), September (19%), July (19%), and October (13%).
In 10 records from GBIF, this species has been collected at elevations ranging from 285 to 12631 ft, with an average (median) of 1319 ft.