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Gallatin Canyon — Hatch Chart

Gallatin · Yellowstone National Park boundary to Spanish Creek / Gallatin Gateway

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

March Browns

46°

#12-16

PMDs

58°

#14-16

Tricos

#18-22

Salmonflies

56°

#4-8

Golden Stones

#8-12

Yellow Sallies

#8-16

Caddis

54°

#12-16

October Caddis

#8-10

Midges

#18-26

Hoppers

#8-12

Ants

#14-18

Beetles

#14-18

Spruce Moths

#14-16

Mayflies

BWOs (Spring) Mar–May · #14-16

BWOs (Fall) Sep–Oct · #16-22

March Browns Apr–May · #12-16 · 46°F

PMDs Jun–Jul · #14-16 · 58°F

Tricos Jul–Sep · #18-22

Stoneflies

Salmonflies Jun–Jul · #4-8 · 56°F

Golden Stones Jun–Jul · #8-12

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

Spruce Moths Jul–Aug · #14-16