Green River Utah Fly Hatch Chart

The Green River is one of the best fly fishing trout rivers in the world. It is such a productive trout fishery due to the prolific year-round fly and insect hatches that provide a never ending cornucopia of sustenance to the rivers fish population.

One of the best ways to catch trout along the Green River is to match the hatch. The following charts list the major hatches that occur on Green River, along with recommended fly patterns to use during each season.

green river utah fly hatch chart

Green River Hatch Chart

Green River Hatches

The following hatch chart lists the major fly and terrestrials hatches along the Green River by season of the year. Actual hatch sizes and emergence dates may vary base on fluctuating water temperatures and flows.

Size Dates
Spring Hatches
Blue Wing Olive (BWO)16 - 18End of March - May
Golden Stonefly10 - 14mid-May - Jul
Pale Morning Dun (PMD)16 - 18mid-May - Jul
Cicadas4 - 10May - June
Midges20 - 24Year round
Summer Hatches
Yellow Sally Stoneflies14 - 16Jun - Jul
PMD's16 - 18mid-May - Jul
Cicadas4 - 10May - June
Caddis Flies14 - 16Aug
Trico20 - 24Jul - Aug
Ants14 - 16Aug - Sept
Beetles14Aug - Sept
Grasshoppers8 - 10Aug - Sept
Mormon Crickets8 - 10Aug - Sept
Midges20 - 24Year round
Fall Hatches
Blue Wing Olive (BWO)16 - 18Sept - Oct
Midges20 - 24Year round
Ants14 - 16Aug - Sept
Beetles14Aug - Sept
Grasshoppers/crickets8 - 10Aug - Sept
Winter Hatches
Midges20 - 24Year round

Recommended Green River Fly Patterns

Matching the hatch is all about identifying the fly pattern that best matches a trout’s natural forage. The closer you can match the hatch, the more trout you’ll catch. The following chart lists recommended fly patterns by season.

Spring Fly Patterns
Parachute Adams16 - 18
BWO Cripple Patterns16 - 20
PMX Parachute Madam12 - 18
Cicadas4 - 10
Befus Para Emerger18 - 22
Grey Scud18 - 22
Tungsten Zebra Midgeblack, brown, wine18 - 20
Fat Albertblack, tan8 - 14
Wooly Buggersblack, gold, olive, white4 - 8
RS2 Emergergray, wine16 - 22
Circus Peanut - Articulated Streamerolive, ginger, black, white2
Summer Fly Patterns
PMX Parachute Madam - Cricket Pattern8 - 14
Chernobyl Antblack, brown, tan4 - 12
Card's Cicada8 - 10, 4 - 6
Yellow Sally CDC & Elk14 - 16
Beefus Para Emerger (for PMD)14 - 16
Fat Albert6 - 14
Elk Hair Caddis14 - 16
Scud grey20
Iron Sally14 - 16
Morrish Hoppertan, pink8 - 14
Vis-a-Dun PMD14 - 16
Tungsten Zebra Midgebrown, disco, wine14 - 16
Wooly Buggersblack, olive, gold, white4 - 8
GT's Triple Doubleblack, amber, purple, olive10 - 16
Fall Fly Patterns
Parachute Adams18 - 20
Cripple BWO Patterns18 - 20
Spotlight Caddis Emergerblack, grey18 - 20
Befus Para Emerger (for BWO)18 - 22
Fat Alberttan, black8 - 14
Grey Scud18 - 22
Parachute Hopperstan, olive8 - 14
Tungsten Zebra Midgeblack, brown, wine18 - 20
Beetlesbrown, black14 - 18
Sailor Antsbrown, black10 - 16
Wooly Buggersblack, gold, white, olive4 - 8
Circus Peanut - Articulated Streamerolive, ginger, black, white2
RS2 Emergergray, wine16 - 22
Royal Wulff14 - 20
GT's Triple Doubleblack, amber, purple, olive10 - 16
Winter Fly Patterns
Parachute Adams20 - 24
Mating Midge20 - 24
BWO Beefus Emerger18 - 22
Gulper Special black18 - 20
WD40 - Midge Emergerwine, grey, black18 - 24
Barr's Emerger BWO22 - 24
RS2 Emergergray, olive, wine20 - 22
Glo Bugspeach, orange, pink, green14 - 18
Soft Hacklegrey18 - 24
Scudsgrey, olive14 - 22
Muddler Minnow6 - 10
Tungsten Zebra Midgebrown, black, wine, purple14 - 20
Wooly Buggersblack, white, gold, olive4 - 8
GT's Triple Doubleblack, amber, purple, olive16 - 18

Hatches by Season

Spring on the Green River is one of the most productive seasons to fly fish Utah’s Green River. The water warms, trout become more active, and the river becomes live with hatches of aquatic insects. Hatches of Blue Wing Olives (BWOs) begin in March and reach their peak by April. In May, terrestrials enter the picture, including cicada hatches, and dry fly fishing begins to take off. Early Spring, before high water end of May, is a precious opportunity for some of the best fly fishing on the river while fishing pressure is still low.

As spring moves into summer and temperatures rise, fly fishing on the Green River really takes off. Trout are voraciously eating the larger mayfly nymphs and hitting cicadas, midge hatches are abundant, and dry fly opportunities are excellent. Dry fly fishing is best on the A and B sections of the Green, while streamer fishing is where it’s at on the lower section. Match the hatch and you’ll have a high catch rate whichever section you fish.

Early June is prime time for fishing cicada patterns. Trout eagerly feed on cicadas as they frequently land on the water. Caddis, PMD and Yellow Sally hatches replace BWOs. These hatches occur through the Green River but are most abundant on section B and C. Terrestials, including ants, beetles, grasshoppers, and crickets are now abundant and remain on the scene through early autumn. October and November are Trico hatches, along with a few more BWOs. This a great time of the year for sight fishing.

Fly fishing on the Green River slows but extends throughout the winters. Midge hatches are consistent and trout continue to feed—albeit at a slower rate. Winter is a great time to fish streamers, small nymphs and midge dry flies.