Flies and techniques to improve your Winter flyfishing success on Freestone rivers in the Vail/Roaring Fork valleys.
Winter Fly Fishing in Colorado: Best Flies for the Roaring Fork and Eagle Rivers
When the snow starts to pile up in the Vail valley, many anglers hang up their rods for the season. But for those who know where (and how) to fish, winter fly fishing in Colorado can be one of the most rewarding times of year. Two of the best winter fisheries in the Rockies—the Roaring Fork River and the Eagle River—offer steady action, solitude, and the chance to connect with beautiful, cold-water trout.
Here’s your guide to the best winter flies for both rivers, when to fish them, and how to make the most of your time on the water.
Understanding Winter Conditions
Water temperatures drop into the 30s and low 40s, and trout metabolism slows. Fish conserve energy, holding in deep pools, tailouts, and slower seams where they don’t have to work hard for a meal. Winter success in Colorado fly fishing means fishing small flies slowly and deep, matching the limited insect life that’s active during the colder months.
Roaring Fork River: Winter Fly Selection
The Roaring Fork River, from Aspen down to Glenwood Springs, remains a solid option throughout winter thanks to its healthy biomass and moderate flows. The lower river, especially below Basalt and through Glenwood, benefits from the warmth of the Fryingpan River, keeping water temperatures more stable.
Top Winter Flies for the Roaring Fork:
- Midges (Sizes 20–24)
- Patterns: Black Beauty, Zebra Midge, WD-40, Top Secret Midge, Rojo Midge
- Tips: Fish double-midge rigs under a small indicator or Euro-nymph tight-line setup. Focus on slower seams and deep runs mid-day.
- Baetis Nymphs (Sizes 18–22)
- Patterns: RS2, Pheasant Tail, Juju Baetis, Micro Mayfly
- When to Fish: On overcast days when water temps reach the low 40s, small baetis become active and trout will key in on them.
- Egg Patterns (Sizes 12–16)
- Patterns: Glo-Bug, Soft Egg, Unreal Egg
- Why: Even in winter, eggs from late-spawning browns and whitefish drift through the system—always worth a shot as an attractor.
- Small Streamers (Sizes 8–12)
- Patterns: Mini Dungeon, Sparkle Minnow, Slumpbuster
- Technique: Fish them slow and deep on a sink-tip or tight-line; a few swings through the deeper holes can wake up a big brown.
- Jig/Tactical Patterns (Sizes 12-18)
Pro Tip:
Below the confluence with the Fryingpan, focus on the stretch through Basalt and Carbondale. Warmer inflows and consistent midge activity make this one of the best winter sections in the valley.
Eagle River: Winter Fly Selection
The Eagle River offers excellent winter fishing between Edwards and Gypsum, where flows stay moderate and trout stack up in slow, deep runs. Cold overnight temps can ice up the upper sections near Minturn, so focus lower in the valley where water remains open and fishable.
Top Winter Flies for the Eagle River:
- Midge Larvae and Pupae (Sizes 20–24)
- Patterns: Mercury Midge, Manhattan Midge, Black Beauty, Foam Wing Emerger
- Presentation: Light tippet (6x), small indicators, and a slow drift are essential. Midday hatches can bring surface eats on calm days.
- Baetis Emergers (Sizes 18–22)
- Patterns: Barr’s Emerger, Two-Bit Hooker, RS2
- When to Fish: Late morning through early afternoon, especially during cloudy weather.
- Stonefly Nymphs (Sizes 10–14)
- Patterns: Twenty Incher, Pat’s Rubber Legs, Coffee Stone
- Why: Winter stones crawl around all season, offering a big-meal option when smaller bugs aren’t producing.
- Junk Flies and Attractors
- Patterns: San Juan Worm, Squirmy Worm, Egg Sucking Leech
- Use: After snowmelt spikes or warm days that stir up sediment—these patterns can turn slow days into banner sessions.
- Jig/Tactical Patterns (sizes 12-18)
Pro Tip:
Fish from Wolcott down to Gypsum where water temps run warmer and fish concentrate in deeper holes. Be stealthy—low, clear flows and wary trout demand finesse.
