Colorado Fly Fishing Reports - Courtesy of The Flyfisher Group

Colorado Fly Fishing Hatch Charts

Colorado's rivers, creeks and streams offer the fly fishing angler a myriad of great insect hatches throughout the season. To take out a little guesswork, you can consult this fly hatch chart before you head out. Hatches vary and if you utilize these localized Colorado fly fishing hatch charts you can get a good general understanding. To make it even easier, our expert fly fishing guides are on the water every day and can take you where the best hatches are occurring.

Colorado Hatch Conditions

Insects Color Dates Emergence Size Spinner Fall Illustrations
© The Flyfisher Group

Caddisflies

American Grannom Bright Green to Greenish Brown Mar 1 -
May 15
Early Morning & Afternoon 10-14 NA
American Grannom Larva illustration American Grannom Emerger illustration American Grannom Adult illustration
Great Gray Spotted Sedge Gray Green to Olive Brown Jun 1 -
Jul 15
Sporadic 10-12 NA
Great Gray Spotted Sedge Larva illustration Great Gray Spotted Sedge Emerger illustration Great Gray Spotted Sedge Adult illustration
Green Sedge Olive to Gray Brown Jul 15 -
Sep 30
Morning & Afternoon 12-14 NA
Green Sedge Larva illustration Green Sedge Emerger illustration Green Sedge Adult illustration
Little Black Sedge Chocolate to Black Jul 15 -
Sep 30
Sporadic 16-18 NA
Little Black Sedge Larva illustration Little Black Sedge Emerger illustration Little Black Sedge Adult illustration
Little Plain Brown Sedge Brown to Chocolate Jun 15 -
Aug 30
Sporadic 14-16 NA
Little Plain Brown Sedge Larva illustration Little Plain Brown Sedge Emerger illustration Little Plain Brown Sedge Adult illustration
Little Sister Sedge Green to Greenish Brown May 15 -
Aug 30
Afternoon & Evening 14-16 NA
Little Sister Sedge Larva illustration Little Sister Sedge Emerger illustration Little Sister Sedge Adult illustration
Little Tan Short Horn Sedge Dark Brown to Yellow Mar 1 -
Aug 30
Sporadic 14-16 NA
Little Tan Short Horn Sedge Larva illustration Little Tan Short Horn Sedge Emerger illustration Little Tan Short Horn Sedge Adult illustration
Little Western Dark Sedge Dark Brown Jun 1 -
Aug 15
Mid Day 16-18 NA
Little Western Dark Sedge Larva illustration Little Western Dark Sedge Emerger illustration Little Western Dark Sedge Adult illustration
Micro Caddis Yellow, Orange or Brown Jun 15 -
Oct 15
Sporadic 20-22 NA
Micro Caddis Larva illustration Micro Caddis Emerger illustration Micro Caddis Adult illustration
October Caddis Orange Tan to Grayish Black Sep 1 -
Oct 30
Shallows, Afternoon & Evening 8-10 NA
October Caddis Larva illustration October Caddis Emerger illustration October Caddis Adult illustration
Spotted Sedge Brownish Yellow May 15 -
Sep 30
Sporadic 10-12 NA
Spotted Sedge Larva illustration Spotted Sedge Emerger illustration Spotted Sedge Adult illustration

Mayflies

Blue Winged Olive Light Olive Brown to Brown Olive Mar 1 -
Nov 15
Clouds & warmest part of day 16-18 Evening
Blue Winged Olive Nymph illustration Blue Winged Olive Emerger illustration Blue Winged Olive Adult illustration
Brown Drake Dark Brown to Blackish Jun 15 -
Jul 15
Evening 10-12 Late Evening
Brown Drake Nymph illustration Brown Drake Emerger illustration Brown Drake Adult illustration
Callibaetis Speckled Dun Tannish Olive to Olive Gray Jun 1 -
Aug 30
Cloudy, Late Morning 14-16 Late Afternoon
Callibaetis Speckled Dun Nymph illustration Callibaetis Speckled Dun Emerger illustration Callibaetis Speckled Dun Adult illustration
Early Pale Morning Dun (PMD) Olivish Yellow to Yellowish Pink Jun 1 -
Sep 15
Mid Morning to Early Afternoon 16-22 Late Evening
Early Pale Morning Dun (PMD) Nymph illustration Early Pale Morning Dun (PMD) Emerger illustration Early Pale Morning Dun (PMD) Adult illustration
Ginger Quill Pale Cream to Whitish Jul 1 -
Sep 15
Morning 14-16 Evening
Ginger Quill Nymph illustration Ginger Quill Emerger illustration Ginger Quill Adult illustration
Gray Drake Gray Jun 1 -
Nov 30
Late Morning 14-16 Evening
Gray Drake Nymph illustration Gray Drake Emerger illustration Gray Drake Adult illustration
Iron Blue Quill Light Olive Tan to Blue Gray Jun 1 -
Aug 15
Warmest part of day 20-22 Evening
Iron Blue Quill Nymph illustration Iron Blue Quill Emerger illustration Iron Blue Quill Adult illustration
Late Pale Morning Dun (PMD) Creamish Olive to Yellowish Jun 15 -
Jul 15
Early Morning 16-18 After Afternoon
Late Pale Morning Dun (PMD) Nymph illustration Late Pale Morning Dun (PMD) Emerger illustration Late Pale Morning Dun (PMD) Adult illustration
Mahogany Dun Reddish Brown to Blackish Brown Sep 1 -
Oct 31
Early Afternoon 16-18 Late Evening
Mahogany Dun Nymph illustration Mahogany Dun Emerger illustration Mahogany Dun Adult illustration
Micro Blue Winged Olive (BWO) Pale Olive Green to Blue Gray Jun 1 -
Nov 30
Clouds & warmest part of day 22-26 Evening
Micro Blue Winged Olive (BWO) Nymph illustration Micro Blue Winged Olive (BWO) Emerger illustration Micro Blue Winged Olive (BWO) Adult illustration
Pink Pale Morning Dun Pink to Orangish to Rusty Red Aug 1 -
Sep 15
Daytime 14-16 Early Morning
Pink Pale Morning Dun Nymph illustration Pink Pale Morning Dun Emerger illustration Pink Pale Morning Dun Adult illustration
Red Quill Reddish Brown Jun 15 -
Sep 30
Mid Morning 14-16 Evening
Red Quill Nymph illustration Red Quill Emerger illustration Red Quill Adult illustration
Slate Winged Drake Brown to Slate Gray Jun 15 -
Aug 1
Early Afternoon 16-12 Evening
Slate Winged Drake Nymph illustration Slate Winged Drake Emerger illustration Slate Winged Drake Adult illustration
Trico Black Jul 15 -
Sep 15
Morning 22-26 Early Afternoon
Trico Nymph illustration Trico Emerger illustration Trico Adult illustration
Western Black Quill Purplish Black to Grayish Brown Apr 1 -
Jun 30
Mid Morning 14-12 Evening
Western Black Quill Nymph illustration Western Black Quill Emerger illustration Western Black Quill Adult illustration
Western Green Drake Dark Olive Jun 1 -
Aug 1
Cloudy, 1-4 pm 8-12 Evening
Western Green Drake Nymph illustration Western Green Drake Emerger illustration Western Green Drake Adult illustration

Midges

Black Midge Blackish to Black Apr 1 -
Nov 15
All Day 18-20 2-3 Hours
Black Midge Larva illustration Black Midge Emerger illustration Black Midge Adult illustration
Chocolate Brown Midge Brown to Chocolate Feb 15 -
Dec 15
All Day 20-22 2-3 Hours
Chocolate Brown Midge Larva illustration Chocolate Brown Midge Emerger illustration Chocolate Brown Midge Adult illustration
Micro Black Midge Blackish to Black Mar 1 -
Nov 15
Morning 22-26 2-3 Hours
Micro Black Midge Larva illustration Micro Black Midge Emerger illustration Micro Black Midge Adult illustration
Snow Midge Gray to Charcoal Jan 1 -
Dec 31
Warmest part of day 24-28 2-3 Hours
Snow Midge Larva illustration Snow Midge Emerger illustration Snow Midge Adult illustration

Stoneflies

Giant Golden Brownish Yellow Jun 1 -
Aug 1
Follows Salmonflies 14-18 NA
Giant Golden Nymph illustration Giant Golden Adult illustration
Micro Black Dark Brown to Black Jan 1 -
May 15
38-44° Water Temps Heat of Day 18-22 NA
Micro Black Nymph illustration Micro Black Adult illustration
Micro Yellow Greenish Yellow to Yellow Jun 1 -
Aug 30
46-54° Water Temps Morning 18-22 NA
Micro Yellow Nymph illustration Micro Yellow Adult illustration
Salmon Fly Black to Reddish Brown May 15 -
Jul 15
50-60° Water Late Morning on 4-8 NA
Salmon Fly Nymph illustration Salmon Fly Adult illustration
September Stone Reddish Brown with Orange belly Aug 15 -
Oct 31
Early Afternoon to Evening 4-10 NA
September Stone Nymph illustration September Stone Adult illustration
Skwala Stone Dark Brown to Yellow Olive Mar 1 -
May 15
38-47° Water Temps, Late afternoon and evening. Riffles and bankwater near foliage. 6-12
Skwala Stone Nymph illustration Skwala Stone Adult illustration
Small Western Brownish May 15 -
Jul 15
46-56° Water Temps 14-18 NA
Small Western Nymph illustration Small Western Adult illustration
Winter Black Black Brown to Reddish Olive, Mottled Brown Apr 1 -
Aug 15
Cold Mountain Streams and Small Ponds 18-22 NA
Winter Black Nymph illustration Winter Black Adult illustration
Yellow Sally Pale Yellow to Pinkish Yellow Jun 15 -
Aug 30
Morning to Early Afternoon 2-8 NA
Yellow Sally Nymph illustration Yellow Sally Adult illustration

Terrestrials

Beetle Brownish to Black May 1 -
Nov 30
All Day 10-18 NA
Beetle  illustration
Black & Red Ant Red & Black Jul 1 -
Sep 30
All Day 18-20 NA
Black & Red Ant  illustration
Black Ant Black May 1 -
Nov 15
All Day 20-24 NA
Black Ant  illustration
Cricket Brownish Olive to Black Jun 1 -
Nov 30
Twilight & Dusk 8-16 NA
Cricket  illustration
Dog Day Cicadas Black & Orange Jul 1 -
Aug 31
Varied NA
Dog Day Cicadas   illustration
Flying Black Ant Black Aug 15 -
Sep 15
Mid Afternoon 14-18 NA
Flying Black Ant   illustration
Grasshopper Green to Brownish Tan May 15 -
Nov 15
All Day 2-14 NA
Grasshopper  illustration Grasshopper  illustration
Red Ant Red to Orangish May 1 -
Oct 15
All Day 18-22 NA
Red Ant  illustration