Best Fishing Spots in Colorado: Local’s Guide to Trophy Waters

Colorado’s Gold Medal waters and high alpine lakes hold some of the best trout fishing in the Lower 48, and four fisheries stand above the rest: the Colorado River, the South Platte, the Blue River, and the state’s alpine lake systems above 10,000 feet. I’ve fished all four for over a decade, and each one rewards a different kind of angler. Here’s where to go, when to go, and what to bring.

Colorado River: The Gold Medal Backbone

The stretch from Kremmling down through Gore Canyon and on to State Bridge is Gold Medal water for a reason. This is big-river fishing: wide runs, deep pools, and browns that push 20 inches if you know where to look. I’ve landed fish in the 18-22 inch range here in October more times than I can count, usually on streamers stripped through the seams below riffles.

The section between Pumphouse and State Bridge gets the most pressure but also the most consistent dry fly action. Blue-winged olives show up reliably in April and again in September, and you’ll see fish rising steadily on overcast days when the hatch is thick. If you want solitude, float the Gore Canyon section. It’s Class III-IV whitewater, so you need a raft and someone who knows the run, but the fish see a fraction of the pressure.

Species and Timing

Brown trout dominate here, with rainbows mixed in, especially below Windy Gap. Runoff typically hits in May and doesn’t clear until mid-June, so I plan trips for late June through October. September and October are money months: cooler water temps, active browns staging for the spawn, and fewer rafters clogging the runs.

Access is mostly BLM land with boat ramps at Pumphouse, Radium, and State Bridge. Wading access exists but it’s limited compared to float access. This is a river built for drift boats and rafts. If you’re wading, stick to the tailouts and avoid the deep center channel; the current moves faster than it looks.

South Platte River: Technical Water for Serious Anglers

Cheesman Canyon is the crown jewel of the South Platte system, and it’s earned its reputation as one of the toughest technical fisheries in the country. The trout here have seen every fly pattern in every fly box from every angler who’s ever waded in. You need 6X or 7X tippet, a drag-free drift, and patience most anglers don’t have.

I’ve spent entire mornings on the “Dream Stretch” below the canyon watching 20-inch rainbows refuse size 22 midge patterns three times before finally eating. It’s humbling. But when you connect, you’re fighting a fish that’s genuinely educated, not a stocked planter that’ll eat anything with a hook.

Deckers and Elevenmile Canyon

If Cheesman feels like too much of a grind, Deckers offers similar water with slightly less pressure and a wider range of fly patterns that work. The river here braids into multiple channels, giving you more water to spread out on. Elevenmile Canyon, downstream of Elevenmile Reservoir, is another Gold Medal stretch with a mix of technical pocket water and slower pools, good for anglers transitioning from stillwater to moving water tactics.

Midges are the year-round staple on the South Platte. Size 22-26 patterns in black, red, and olive will cover 80% of your fishing. Blue-winged olives hatch in spring and fall, and there’s a solid Trico hatch in July and August that brings up fish in the early morning before the sun hits the water.

Access and Regulations

Cheesman Canyon requires a hike in from the Gill Trailhead, about 2 miles each way, and it’s flat-water access only, no boats. Check current flow releases from Cheesman Reservoir before you go. Anything over 150 CFS and the wading conditions change fast. This entire stretch is catch-and-release, artificial flies and lures only.

Blue River: The Tailwater Everyone Overlooks

Running through Silverthorne right below Dillon Reservoir, the Blue River tailwater is criminally underrated. Because it flows through town, most anglers drive right past it without a second look. That’s a mistake. The stretch through Silverthorne’s Blue River Trail has held some of the largest average-size trout I’ve caught in the state. Consistent cold water from the reservoir bottom keeps fish active and feeding year-round.

Winter fishing on the Blue is some of the best in Colorado precisely because it doesn’t freeze up like freestone rivers do. I’ve fished it in January with air temps in the teens and still put fish in the net on small midge patterns fished deep and slow.

What’s Biting and When

Rainbows and browns both, with the occasional Kokanee salmon during the fall run when they push up from the reservoir. Spring and fall bring strong midge and BWO activity. Summer sees decent caddis hatches in the evenings. The section below the outlet down through town is easy wading with a gravel bottom, making it one of the more approachable Gold Medal waters for someone still building their technical skills.

Access is excellent. The Blue River Trail runs right alongside most of the fishable water, and there’s public parking at multiple points through Silverthorne. This is a good option if you’re traveling with a non-fishing partner who wants to walk or bike while you fish.

Alpine Lakes: High-Altitude Trophy Water

This is where Colorado separates itself from every other trout state. Above treeline, in basins accessible only by trail, you’ll find cutthroat and brook trout that rarely see a fly. Grand Lake, the state’s largest natural lake, offers boat access and a mixed fishery of lake trout, rainbow, and kokanee. But the real prize is in the backcountry.

Trapper Lake near Meeker is one of my favorite full-day trips: a moderate hike gets you to water holding cutthroat that fight harder than their size suggests thanks to the thin, cold water. In Rocky Mountain National Park, lakes like Sky Pond and Lake of Glass require serious hiking (6-8 miles round trip with real elevation gain) but reward you with greenback cutthroat, Colorado’s native and once-endangered species.

Gear Considerations for Alpine Lakes

High-altitude fishing changes your gear calculus completely. You’re not driving to a boat ramp. You’re hiking in, often at 10,000 to 12,000 feet, and the weather turns fast. I’ve had 70-degree afternoons drop to snow flurries within an hour above treeline. Pack layers, always.

A lightweight 3-weight or 4-weight rod is perfect for these smaller, wary fish. I run a 7’6″ 4-weight for most alpine work — enough backbone to handle wind but delicate enough to protect light tippet on spooky cutthroat in gin-clear water.

Seasonal Timing Breakdown

Timing your trip right matters more in Colorado than almost anywhere else because of runoff and elevation extremes. Here’s how I break down the season:

• March-April: Tailwaters (South Platte, Blue River) fish well with midge hatches. Freestone rivers still running high and cold from snowmelt.
• May-June: Runoff season. Most freestone rivers, including the Colorado, blow out and turn chocolate. Stick to tailwaters during this window.
• July-August: Prime time for alpine lakes once snow clears from high trails. Freestone rivers clear and fish well, especially mornings before afternoon thunderstorms roll in.
• September-October: My favorite window. Cooler temps, fewer crowds, and browns staging for the fall spawn on the Colorado River and Blue River. Alpine lake access closes as early snow hits higher elevations.
• November-February: Tailwater season. South Platte and Blue River fish consistently all winter since bottom-release dams keep water temps stable.

What I Actually Pack for Colorado

The gear that works on a lowland trout stream doesn’t always cut it at 10,000 feet. UV exposure is brutal, weather changes fast, and you’re often carrying everything in on foot. Here’s what I actually bring on Colorado trips, tested over hundreds of days on these exact waters.

Waders

For cold tailwater fishing on the South Platte and Blue River in shoulder seasons, you need breathable waders that won’t leave you soaked from sweat on the hike in and shivering once you’re standing in 40-degree water. I’ve run the Simms G3 Guide waders for three seasons now, and the Gore-Tex construction handles both the hike and the water without a single leak.

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These aren’t cheap, but I’ve put over 200 days in mine across rocky Colorado riverbeds and they still don’t leak. That’s the kind of durability that matters when you’re two miles from the truck.

Wading Boots

Colorado’s rivers run over slick, rounded rock, especially the Colorado River and the Blue. Felt soles are illegal in some Western states now due to invasive species concerns, so I run studded rubber soles. The Korkers Darkhorse use an interchangeable sole system, letting me swap between felt and studded rubber depending on where I’m fishing that day.