Gallatin Valley — Hatch Chart

Gallatin · Spanish Creek / Gallatin Gateway to Three Forks (confluence with Madison and Jefferson)

Mayfly Stonefly Caddis Midge Terrestrial | darker = peak activity

Insect Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Size

BWOs (Spring)

#14-16

BWOs (Fall)

#16-22

PMDs

58°

#14-16

Tricos

#18-22

Yellow Sallies

#8-16

Caddis

54°

#12-16

October Caddis

#8-10

Midges

#18-26

Hoppers

#8-12

Ants

#14-18

Beetles

#14-18

Mayflies

BWOs (Spring) Mar–May · #14-16

BWOs (Fall) Sep–Oct · #16-22

PMDs Jun–Jul · #14-16 · 58°F

Tricos Jul–Sep · #18-22

Stoneflies

Yellow Sallies Jun–Aug · #8-16

Caddis

Caddis May–Aug · #12-16 · 54°F

October Caddis Sep–Oct · #8-10

Midges

Midges Jan–Dec · #18-26

Terrestrials

Hoppers Jul–Oct · #8-12

Ants Jul–Oct · #14-18

Beetles Jul–Oct · #14-18