Crack the Code on the Blue River Hatch

Blue River
Hatch Chart 2025

From tailwater midges to summertime hoppers, the Blue River makes you earn every take. Fish smarter with our full hatch chart and fly matching tips.
Hatch Charts

Know what’s hatching, when it’s happening, and what flies to tie on—month-by-month intel from the heart of Colorado trout country. Hatches by month and type are below. 

 

A River That'll Keep You Guessing—and Grinning

The South Platte River is Colorado’s overachiever: part tailwater, part freestone, all attitude. From Cheesman Canyon’s spooky trophies to Deckers’ weekend rodeo, this river makes you earn every trout—but man, does it pay off. The fish are smart. The bugs are picky. And if you think you can just toss any old fly out there, well… better pack a lunch.

That’s why knowing the hatch matters. Below is a month-by-month breakdown of the most reliable bug activity on the South Platte, plus our top fly picks for matching the hatch. Whether you’re stalking sipping rainbows or dredging for grudging browns, this chart is your river-side cheat sheet.

South Platte River Hatch Chart – By Month
South Platte River Hatch Chart by Month
Month Main Hatch Secondary Bugs Tertiary Bugs Guide Tip
January Midges (#20–#26) Winter Stoneflies Micro BWOs Slow drifts, long leaders, light tippet. Fish deep.
February Midges (#22–#26) Stoneflies Micro Baetis Pair midges with egg patterns. Trout stay low.
March BWOs (#18–#22) Midges Early Stones Cloudy days = swinging soft hackles goldmine.
April BWOs Early Caddis Midges Focus on pods of risers. Delicate dry fly work.
May Mother's Day Caddis BWOs Early PMDs Skittering caddis and emergers dominate the hatch.
June PMDs (#16–#18) Caddis Yellow Sallies Dry + emerger combos are deadly in pocket water.
July Tricos (#20–#24) Caddis Hoppers Start early. Switch to terrestrials after the spinner fall.
August Tricos Ants, Beetles, Hoppers PMDs Prospect with a beetle + midge dropper mid-morning.
September BWOs Fading Tricos Late Caddis RS2s and emergers shine on cloudy fall afternoons.
October BWOs Midges Streamers Start with dries. Switch to meat if the clouds roll in.
November Midges BWOs Eggs Mix midge nymphs with an egg pattern for depth.
December Midges Winter Stones Baetis Drift small midge larvae slow and deep in tailouts.

 

Learn the Bugs, Land the Fish

Matching the hatch doesn’t mean being a bug nerd (though we fully support it). It means noticing size, silhouette, and how those little guys behave in the water. Presentation > Perfection. Want to fish better tomorrow? Start by tying one better knot today.