TroutTips
Real Hatch Data

Colorado Hatch Charts by River & Month

What’s hatching on 28 Colorado trout rivers, and when. Drawn from the published hatch charts of 26 fly shops, guides and fishing sites.

By River

What’s hatching on the Colorado River

Tap an insect to see where its dates come from.

Hatching now · Nov 4

Blue-Winged Olives (BWO)Hatching nowMar – May and Aug – Nov · hook #16–22 · through Nov8 sources

Where these dates come from:

  • Fly Shack “Blue Winged Olive (spring)”: Mar 15 – May 22 · #16-22
  • Fly Shack “Blue Winged Olive (fall)”: Aug 23 – Sep 22 · #16-22
  • Big Y Fly Co “BWO (spring)”: Mar 15 – May 15 · #16-20
  • Big Y Fly Co “BWO (fall)”: Sep 1 – Oct 31 · #16-20
  • FlyFishFinder “Blue-Winged Olive”: Mar – May (months only) · #18-22
  • FlyFishFinder “Blue-Winged Olive”: Sep – Nov (months only) · #18-22
  • Alpine Angling “Blue Winged Olives”: Mar – May (months only) · #16-20
  • Alpine Angling “Blue Winged Olives”: Aug – Sep (months only) · #16-20
MidgesHatching nowSep 1 – Mar 31 · hook #18–28 · through Mar 314 sources

Where these dates come from:

Coming up

CaddisNext: MarMar – Sep 30 · hook #10–184 sources

Where these dates come from:

  • Fly Shack “Caddis (various)”: Apr 15 – Sep 30 · #10-18
  • Big Y Fly Co “Caddis”: Apr 15 – Sep 15 · #10-18
  • FlyFishFinder “Caddis”: May – Sep (months only) · #14-18
  • Alpine Angling “Caddis”: Mar – Sep (months only) · #10-18
Golden StonefliesNext: MayMay – Aug 31 · hook #6–124 sources

Where these dates come from:

  • Fly Shack “Golden Stonefly”: Jun 15 – Aug 22 · #8-10
  • Big Y Fly Co “Golden Stone”: Jun 1 – Aug 31 · #8-10
  • FlyFishFinder “Golden Stonefly”: May – Jun (months only) · #6-10
  • Alpine Angling “Golden Stoneflies”: May – Aug (months only) · #8-12
SalmonfliesNext: May 15May 15 – Jul · hook #4–103 sources

Where these dates come from:

  • Fly Shack “Salmon Fly”: May 23 – Jun 30 · #4-6
  • Big Y Fly Co “Salmonfly”: May 15 – Jun 30 · #4-6
  • Alpine Angling “Salmonflies”: Jun – Jul (months only) · #6-10
Green DrakesNext: JunJun – Aug · hook #10–142 sources

Where these dates come from:

Pale Morning Duns (PMD)Next: JunJun – Sep · hook #14–203 sources

Where these dates come from:

  • Fly Shack “Pale Morning Dun”: Jun 23 – Aug 22 · #16-20
  • Big Y Fly Co “PMD”: Jun 15 – Aug 30 · #16-18
  • Alpine Angling “Pale Morning Duns”: Jun – Sep (months only) · #14-18
Red QuillsNext: JunJun – Sep · hook #10–183 sources

Where these dates come from:

  • Fly Shack “Red Quill”: Jul 8 – Aug 22 · #14-18
  • Big Y Fly Co “Red Quill”: Jul 15 – Aug 30 · #10-16
  • Alpine Angling “Red Quills”: Jun – Sep (months only) · #12-16
Yellow SalliesNext: JunJun – Sep · hook #14–162 sources

Where these dates come from:

  • FlyFishFinder “Yellow Sally”: Jun – Aug (months only) · #14-16
  • Alpine Angling “Yellow Sallies”: Jul – Sep (months only) · #14-16
Hoppers & terrestrialsNext: JulJul – Sep · hook #6–184 sources

Where these dates come from:

  • Fly Shack “Terrestrials (various)”: Jul 8 – Sep 22 · #6-18
  • Big Y Fly Co “Hoppers”: Jul 15 – Sep 25 · #6-12
  • Alpine Angling “Hoppers”: Jul – Sep (months only) · #6-14
  • Alpine Angling “Ants & Beetles”: Jul – Sep (months only) · #14-18

Also on the sources’ charts

Attractor patternsMay 1 – Sep 14 · hook #8–181 source

Where these dates come from:

  • Fly Shack “Attractors (various)”: May 1 – Sep 14 · #8-18
Streamers & baitfishAll yearAll year · hook #2–121 source

Where these dates come from:

Some of the 26 sources list only months, not days, so treat the dates as a guide and check conditions before you go.

Across Colorado

What’s hatching across Colorado in November

Every insect with published dates in that month, and the rivers where it hatches. Pick a river to see its full chart.