Mountain West
Fly fishing in Colorado
Short answer
Colorado fly fishing is high-altitude tailwater and mountain river fishing, with rainbow, brown and brook trout plus native cutthroat in the headwaters. The South Platte, Fryingpan, Gunnison, Arkansas and Roaring Fork are the headline waters. A license is required from age 16, anglers 18 to 64 also need a Habitat Stamp, and the tailwaters fish all twelve months.
What makes Colorado different
Colorado's rivers are built on snowmelt, which means most freestone water is unfishable brown soup through May and June. The state's fly fishing therefore grew up around dam-released tailwaters that stay cold and clear every month of the year — Cheesman Canyon and the Dream Stream on the South Platte, the Fryingpan below Ruedi, the Blue below Dillon. Those stretches hold a lot of trout that see a lot of anglers and eat very small insects, and that pressure is why Colorado produced so much of the modern technical nymph canon: the RS2, Barr's Emerger and the Copper John were all tied here for exactly this water. The Fryingpan adds a quirk of its own — mysis shrimp flushed out of the reservoir grow browns to a size the river could not otherwise support. Everything also happens high: much of this is fished between 7,000 and 10,000 feet, where afternoon thunderstorms are routine and the first day is slower than you expect.
What trout are in Colorado?
- Rainbow trout
- Widespread, and the main quarry on most tailwaters.
- Brown trout
- Wild throughout. The Fryingpan's mysis-fed browns are the famous ones.
- Brook trout
- High-country streams, beaver ponds and alpine lakes. Small and abundant.
- Cutbow
- Rainbow-cutthroat hybrids, common on the South Platte.
- Greenback cutthroat
- The state fish. ESA-listed and restricted to a handful of restored headwater streams.
- Colorado River cutthroat
- Native on the Western Slope.
- Rio Grande cutthroat
- Native in the southern drainages.
Where to fly fish in Colorado
- South Platte River
- Cheesman Canyon and the Dream Stream. Gin-clear, heavily fished, and a lesson in long tippet and small flies.
- Fryingpan River
- Tailwater below Ruedi. Mysis shrimp, outsized browns, and green drakes in July.
- Roaring Fork River
- Freestone through Basalt and Carbondale. Drakes in summer and a very strong autumn.
- Gunnison Gorge
- A hike-in canyon below the Black Canyon. Stoneflies, big water, and far fewer people.
- Arkansas River
- Gold Medal water. The caddis hatch works upstream from Cañon City through May.
- Blue River
- Tailwater below Dillon, running through Silverthorne. Technical, mysis-fed, and open all winter.
When to fly fish in Colorado
| When | What is happening |
|---|---|
| January – March | Tailwaters only. Midges, then the first Baetis on warmer afternoons. |
| April – May | Blue-wing olives, then the Arkansas caddis hatch climbing upstream. Freestone runoff begins. |
| June | Peak snowmelt. Most freestone rivers are off; fish tailwaters, and the high lakes as they thaw. |
| July – August | Green drakes on the Fryingpan and Roaring Fork, PMDs, terrestrials, and the high country finally open. |
| September – October | Baetis, pre-spawn browns and the best few weeks of the year. |
| November – December | Back to midges and small nymphs on the tailwaters. |
Do you need a license to fly fish in Colorado?
Yes. Licenses are issued by Colorado Parks and Wildlife.
| License | Price |
|---|---|
| Resident, annual | $44.87 |
| Non-resident, annual | $124.01 |
Figures are CPW's 2026 published rates for an adult annual fishing license. A Habitat Stamp, $12.76 for residents and non-residents alike, is required in addition for anglers 18 to 64. Prices change — check with the agency before you buy.
Rules worth knowing before you go
- A fishing license is required from age 16. Anglers 18 to 64 must also buy one Habitat Stamp per license year.
- The annual license year runs 1 March to 31 March of the following year — thirteen months.
- Many tailwaters are catch-and-release, artificial flies and lures only, including Cheesman Canyon and much of the Fryingpan.
- Fishing two rods at once requires a Second Rod Stamp.
- Greenback cutthroat recovery streams carry their own rules and some are closed outright. Check the water before you fish it.
Regulations change every year and vary water by water. The Colorado Parks and Wildlife rule book is the only authority — this page is a starting point, not a legal reference.
Flies that matter in Colorado
Each of these is a card in the deck, and each has a full page in Our Fly-brary.
Keep reading
- Do I need a fishing license? — how licensing works across states
- How to read water — where trout hold, anywhere
- Best time of day to fly fish — the seasonal logic behind the table above
- Our Fly-brary — every fly in the deck, explained
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The deck
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A 54-card fly-fishing deck of original hand-drawn flies, each explaining what it imitates. Made by a father-and-daughter team in Eagle, Idaho.
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