Denver has the unusual luck of being a city where the trout fishing does not stop when the snow starts. The big South Platte tailwaters run cold and clear all winter, the Blue below Dillon is a lunch-break river, and the Front Range canyons are small enough to wade in tennis shoes and close enough to fish after work. It is also, fairly, a city where everybody has heard of Cheesman Canyon and the Dream Stream, and where a perfect cast is no guarantee of a quiet pool. Both things are true. Plan accordingly.
Deckers for the easy day. Cheesman for the humbling one. Clear Creek for the weeknight.
Fly Fishing from Denver: A City That Fishes in Winter
Denver anglers are spoiled for choice in a way that is easy to forget. Within an hour or two there are tailwaters that fish through the winter, freestone canyons that are open and uncrowded outside summer, and small creeks you can fish after work. What a city angler needs is a map of which kind of day each one is.
This guide is about access: where to go, what kind of water it is, who issues the license and where to check the rules. The method lives in the other playbooks. A word of honesty runs through all of it: the famous water is crowded, the fish have seen every fly, and the better days tend to be on the shoulders of the season or in the middle of the week.
The South Platte: Four Reaches, Four Different Days
Deckers, Cheesman Canyon, Eleven Mile Canyon and the Dream Stream: the same cold tailwater, very different fishing.
Deckers is Cheesman's easygoing cousin downstream: the same wild browns and rainbows and the same cold tailwater, but roadside and walk-right-in. That accessibility is the story. It is one of the most popular trout reaches in Colorado, it fishes year round, and it is forgiving enough to learn on and technical enough to keep you honest. The winter midge fishing is a genuine Front Range gift when everything uphill is frozen.
Cheesman Canyon is the one that humbles people: a hike-in granite gorge below Cheesman Dam, wild and educated fish in very clear water, catch-and-release, artificial flies and lures water (check the current rule). You sight-fish, go small and use tippet you can barely see. It is worth the walk in, but go with the expectation that some fish will refuse you politely all afternoon.
Upstream, Eleven Mile Canyon is the reach below the reservoir, a granite-walled tailwater with a road alongside, popular and pretty in equal measure and a popular choice outside summer, though the shaded canyon can ice up, so check conditions. The Dream Stream between Spinney and Eleven Mile is open meadow tailwater that grows big rainbows and browns, and draws a crowd. The crowding is real. Rainbows spawn in spring and browns in autumn, so stay off the redds and give spawning fish a miss.
Front Range Canyons: The After-Work Waters
Clear Creek at Golden, Boulder Creek and St. Vrain at Lyons: small, close and honest about it.
Clear Creek is the Denver metro's closest thing to mountain pocket water, a small, fast freestone along US-6 that runs right through Golden. It is no secret and it is no wilderness, but it holds browns and rainbows and fishes well in the cooler months. It blows out fast in runoff and after a storm, and through Golden the summer tubing crowd is a fact of life.
Boulder Creek in Boulder Canyon is the quintessential small-water quick hit, tumbling freestone beside CO-119 with special regulations on some reaches, so check the current CPW rules. St. Vrain Creek comes down two canyon forks to meet at Lyons, took the brunt of the 2013 flood and has come back as honest brown-and-rainbow water; the town reaches are easy and the canyons above are quieter. Neither is a destination. Both are hard to beat for an after-work hour.
North and West: Big Thompson, Poudre and the Blue
Canyon fishing out of Estes Park and Fort Collins, and a tailwater in a shopping district.
The Big Thompson below Lake Estes is the Front Range canyon fix: tailwater-fed, release-driven and tight pocket water, with special-regulation reaches in the canyon. It fishes through the winter and makes a reliable quick hit when the high country is shut. The 2013 flood reshaped this canyon, so check current access and conditions before you go.
The Cache la Poudre is Fort Collins' river and the state's only Wild and Scenic stretch, with wild browns and rainbows in classic pocket water and catch-and-release flies-only sections. In summer it is also one of the busiest rafting canyons on the Front Range, so fish the mornings, the shoulders of the season and the upper canyon. The canyon has a wildfire and debris-flow history, and flow and turbidity after storms can make it unfishable, so check conditions first.
The Blue below Dillon is a tailwater you can fish on a lunch break off I-70, running through Silverthorne. There are big fish fat on mysis flushed through the dam, but they are spooky and well cast to. Below town the public water becomes tangled with private, so check boundaries carefully.
Winter on the Front Range
The reason Denver is a trout city in January: release-fed water, midges and low crowds.
Most anglers hang up the rod when the weather turns, but this is where the Front Range gets good. The South Platte tailwaters, the Big Thompson and the Blue all run on reservoir releases, so they stay open and fishable when freestones lock up. Midges, small nymphs and fine tippet are the standard approach, and the best days are mid-afternoon on a warm, still winter day.
Clear Creek also fishes well in the cooler months. Keep an eye on ice, access roads and flow changes, and check the current regulations: many of the best reaches are special-regulation water.
The rest of the year has its own rhythm. The freestones (Clear Creek, Boulder Creek, St. Vrain) run high and off-color in snowmelt runoff, usually in late spring and early summer, so look to the tailwaters then. Summer brings caddis, mayflies and terrestrials but also the biggest crowds on the Platte. Autumn is a good time for small mayflies and for browns, which spawn then, so stay off redds.
Getting There and Where to Check
Most of this is driving; plan for weekend traffic and parking before you plan for fish.
Clear Creek and Boulder Creek are weeknight-close; Deckers and Cheesman are a morning's drive; the Dream Stream and Eleven Mile are further out on the way to the high country; the Poudre, Big Thompson and the Blue are a half to full day. Roadside pullouts fill early on summer weekends, so aim for midweek and early starts, and leave the redds alone.
Check Colorado Parks and Wildlife for licenses, current regulations and any closures, and check the managing land agency for parking and access rules at the specific site. Where a reach is hike-in, plan water, daylight and weather accordingly.
Gear and Licenses
A nine-foot four-weight, fine tippet and a pocketful of midges.
A nine-foot four- or five-weight with a floating line handles almost everything on this list. Bring 6X and 7X tippet for the tailwaters, a handful of midge and small-nymph patterns for winter, and a few caddis and terrestrials for the summer. Polarized glasses matter more here than almost anywhere, because so much of the fishing is sighted.
Colorado Parks and Wildlife issues fishing licenses and publishes regulations, including the special catch-and-release and flies-and-lures sections. Always check the current rules for the specific water.