Top Fall Fly Hatches in Colorado: Match the Hatch for Big Catches

Blue-Winged Olives (BWOs): The Cool-Weather Classic

• Season: Mid-September to November
• Prime Time: Overcast mornings and lazy afternoons
• Go-To Flies: Parachute Adams, BWO emergers

Why they’re awesome: These tiny mayflies might not look like much, but they’re the equivalent of trout candy. Drift them in slower currents where fish can take a good look, and you’ll be rewarded.

Pro Tip: Got a cloudy day? Break out your BWOs. Trout love these hatches when the skies are gray.

October Caddis: The Pumpkin Spice of Flies

• Season: Late September to mid-October
• Prime Time: Sunny afternoons
• Go-To Flies: Orange Stimulator, Elk Hair Caddis

Why they’re awesome: Bold, orange, and hard to miss, October Caddis are like the big, flashy appetizers of the trout world. Toss these flies into riffles or along current edges for explosive strikes.

Pro Tip: If your drift isn’t getting action, give your fly a little twitch. The movement mimics the natural behavior of Caddisflies.

Midges: The Little Fly That Could

• Season: All fall, especially cooler days
• Prime Time: Mornings and late afternoons
• Go-To Flies: Zebra Midge, Griffith’s Gnat

Why they’re awesome: Don’t underestimate the power of these pint-sized flies. Midges are a constant in the trout’s diet, especially when other hatches slow down. Perfect for slow pools and deep runs.

Pro Tip: Use lighter tippet (think 6X or 7X) for a more natural presentation. Trout can be picky!

Mahogany Duns: A Hidden Gem

• Season: Late September to October
• Prime Time: Warm, sunny days
• Go-To Flies: Comparadun, Rusty Spinner

Why they’re awesome: These lesser-known reddish-brown mayflies offer a secret weapon for savvy anglers. They’re especially effective in moderate currents where trout love to hold.

Pro Tip: Mahogany Duns are best fished during the warmest part of the day when the water’s surface comes alive.

Best Fall Fishing Spots in Colorado

• Fryingpan River: Known for epic BWO hatches and crystal-clear water.
• South Platte River: A midge and BWO paradise, with easy access.
• Colorado River: Your go-to for October Caddis strikes.
• Gunnison River: Stunning autumn views paired with diverse hatches.

Pro Tip: Pick a spot with a mix of currents—riffles for October Caddis, slow pools for midges, and runs for BWOs.

Quick Tips for Fall Fly Fishing Success

1. Timing is Key: Early mornings and late afternoons bring the best action.
2. Watch the Weather: Overcast days often mean peak BWO activity.
3. Dress Smart: Layers, waders, and waterproof boots are a must.
4. Stay Stocked: Carry a mix of fly patterns—fall trout aren’t one-size-fits-all.
5. Savor the Scenery: Fall in Colorado is as much about the experience as the catch.

Grab your rod, your favorite flies, and a thermos of hot coffee—it’s time to embrace fall fishing at its finest. With these hatches on your radar and a little patience, you’re in for unforgettable days on Colorado’s iconic rivers. Tight lines!