The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
Time of year : May through October; peaking from August to October
In 48 records from GBIF, adults of this species have mostly been collected during September (25%), October (23%), July (15%), August (15%), November (10%), and February (6%).
In 7 records from GBIF, this species has been collected at elevations ranging from 1751 to 9318 ft, with an average (median) of 6407 ft.