Bighorn Hatch Chart

Type When Description Size
Midges Year Long black, gray, olive, red, tan, cream 18-24
Spring Baetis April – May olive brown nymph/olive gray adult 16-22
Yellow Sally
(Little Yellow Stone)
June – July yellow/tan 12-16
Pale Morning Dun July – August olive brown nymph/amber adult 14-16
Hoppers Mid July – Sept yellow, tan, green 6-14
Terrestrials & Ants Mid July – Sept black, cinnamon brown 16-22
Tan Caddis Aug – Oct tan pupae-mottled tan adult 12-16
Black Caddis Aug – Sept olive pupae-black adult 16-20
Trico Mid Aug – Oct males-black, females-olive 18-24
Fall Baetis Sept – Nov olive brown nymph/olive-gray adult 18-24
Sow Bug Year Long pink, white, tan 14-18
Scuds Year Long tan, orange, olive, gray 12-20
Aquatic Worm Year Long red, orange, tan, wine 8-12
Cranefly Larvae Year Long cream, tan, brown 4-10
Leeches Year Long black, brown, olive, rust 6-10
Minnows Year Long olive, yellow-brown, silver-black 2-10