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.
Time of year : June through early August
Preferred waters: Small streams
Altitude: Above 5,000 feet
In 9 records from GBIF, adults of this species have been collected during July (33%), May (22%), June (22%), August (11%), and April (11%).
In 7 records from GBIF, this species has been collected at elevations ranging from 131 to 8500 ft, with an average (median) of 3363 ft.
Current speed: Fast
Environmental tolerance: Requires very cold streams