Blue Winged Olive Hatch Information
Blue Winged Olives – Bwo’s are the most significant mayfly hatch on the Bighorn River. April and May are the primetime for baetis hatches and again in the fall. The Spring BWOs are size 16-20. The Fall BWOs are smaller–18, 20, 22.
Spring Hatch: April – June Fall: September – October
Bighorn River Fishing Tip: Imitating the BWO swimming nymphs is just as important as fishing the more visible duns.
Read More: Blue Winged Olives of Spring and Fall
Baetis Dun
