Lower Jefferson — Hatch Chart

Jefferson · Cardwell area to Three Forks (confluence with Madison and Gallatin)

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

Caddis

54°

#12-16

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

Caddis

Caddis May–Aug · #12-16 · 54°F

Midges

Midges Jan–Dec · #18-26

Terrestrials

Hoppers Jul–Oct · #8-12

Ants Jul–Oct · #14-18

Beetles Jul–Oct · #14-18