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 mostly been collected during October (22%), September (22%), November (19%), August (13%), March (9%), and December (6%).
In 10 records from GBIF, this species has been collected at elevations ranging from 34 to 6972 ft, with an average (median) of 502 ft.