Dillon Reservoir, CO

About Dillon Reservoir

Dillon Reservoir, often called Lake Dillon, sits at roughly 9,000 feet in the heart of Summit County, Colorado, ringed by the towns of Frisco, Dillon, and Silverthorne and framed by the Tenmile and Gore mountain ranges. Built as a water-supply reservoir for the Denver metro area, it is one of the largest bodies of water in the Colorado high country, with deep, cold, exceptionally clear water and a long, irregular shoreline shaped by the Blue River, Tenmile Creek, and the Snake River arms that feed it.

Among Colorado anglers, Dillon is best known as a premier kokanee salmon fishery and a strong producer of trophy-class brown trout, alongside healthy populations of rainbows. Its cold, deep, food-rich water grows fish well, and the alpine scenery makes it a bucket-list destination as much for the setting as for the catch. Because it is a high-elevation reservoir, the season is short but intense, and the fishery rewards anglers who understand how trout and salmon move through the water column as the water warms and cools.

Fish Species

Dillon is a coldwater fishery through and through, and the standout species are salmon and trout:

• Kokanee salmon — the signature fish of Dillon Reservoir. These landlocked sockeye are plankton feeders that school in open water and turn a striking red as they stage to spawn in fall. Trolling for kokanee is one of the lake's most popular pursuits.
• Brown trout — Dillon has a reputation for producing big, healthy browns. They become especially aggressive and accessible in fall as they move shallow and toward tributaries to spawn.
• Rainbow trout — abundant and willing, rainbows are the bread-and-butter catch for shore and boat anglers alike, taking bait, spinners, and flies throughout the open-water season.

Anglers may also encounter the occasional cutthroat or brook trout, and a few suckers, but kokanee, browns, and rainbows are what draw people to this water.

Best Seasons & Times

Dillon is a high-altitude reservoir, so its calendar runs late and short. Expect ice and cold well into spring, a productive open-water window through summer, and a dramatic fall finale.

• Spring/ice-out: As the ice recedes (often well into spring at this elevation), trout move shallow to feed in warming water near inlets and the shoreline. This is an excellent time for rainbows and cruising browns close to the bank.
• Summer: As the surface warms, trout and especially kokanee slide deeper to find cold, oxygen-rich water and concentrations of plankton. Boaters do well trolling at depth, while early-morning and evening windows produce best for shore anglers. Afternoon mountain thunderstorms and wind are common—plan around them.
• Fall: The marquee season. Kokanee stage and turn red as they prepare to spawn, and brown trout grow aggressive and move shallow toward tributaries. Cooling water pulls fish back up in the column, making this the prime trophy-brown and kokanee window.
• Winter: Once safe ice forms, Dillon becomes a notable ice-fishing destination for trout and kokanee. Always verify ice conditions independently before venturing out—high-country ice is variable.

Across the open-water season, the best bites are usually at first light and the last hour of daylight, when the clear water and bright alpine sun make low-light periods especially productive.

Techniques & Baits

Tactics at Dillon center on locating cold water and feeding fish, then matching the bait to the species:

• Kokanee: Trolling is king. Use downriggers or weighted setups to reach the depth fish are holding, pulling small dodgers or flashers ahead of pink or orange hoochies, micro-spoons, or tipped hooks. Kokanee feed on plankton, so the strike is reaction-based—bright colors and a tight, erratic action draw bites. Tip baits with shoepeg corn (often scented) where regulations allow.
• Brown trout: In fall, target browns near tributary mouths and shoreline structure with brown- and gold-bodied stickbaits and jerkbaits, larger spinners, and streamers that imitate baitfish. Slow presentations in low light are deadly. The rest of the year, work points, drop-offs, and inlets.
• Rainbow trout: Classic Colorado trout methods shine—small spinners and spoons, fly-and-bubble rigs, and bait fished off the bottom or under a bobber from shore. Inlets and the upper reaches of the lake arms concentrate fish.
• General: Dillon's water is cold and clear, so finesse and lighter line help in bright conditions. A boat or float-tube greatly expands your options, but the long shoreline and inlet areas give bank anglers real opportunities, especially around ice-out and in fall.

Access & Launches

Dillon Reservoir is a public, multi-use reservoir surrounded by the towns of Frisco, Dillon, and Silverthorne and bordered by Forest Service land, so access is generally good. There are public marinas and boat ramps around the lake serving boaters, along with extensive shoreline access for bank anglers, much of it reachable from town parks, recreation paths, and roadside pullouts near the various lake arms and inlets.

Note that this is a Denver Water supply reservoir, so certain rules apply on the water itself—body contact (swimming and wading) is restricted, and boating is managed through the local marinas. Ramp availability and launch services are seasonal and tied to water levels, which fluctuate as a working reservoir. Check current local marina and recreation-area information before you go to confirm what's open and where to launch.

Regulations & Licenses

A valid Colorado fishing license is required for all anglers of licensing age, and it's the angler's responsibility to carry it and follow current rules. Dillon is managed by Colorado Parks and Wildlife, and limits, gear restrictions, and any special rules for kokanee salmon, trout, and other species can change from year to year. Snagging seasons or specific kokanee provisions sometimes apply during the fall spawn at Colorado reservoirs, so confirm what's currently allowed.

Before fishing, review the current Colorado Parks and Wildlife regulations for bag and possession limits, size or slot limits, bait and tackle restrictions, and any reservoir-specific rules for Dillon. Regulations and water-use rules can also be affected by the reservoir's status as a drinking-water supply, so check both the state fishing regulations and any local restrictions.

Frequently Asked Questions

What fish is Dillon Reservoir known for?
Dillon is best known for kokanee salmon and trophy-class brown trout, along with strong numbers of rainbow trout. It's a classic high-altitude Colorado coldwater fishery, with kokanee trolling and big fall browns being the main draws.

When is the best time to fish Dillon Reservoir?
Fall is the marquee season—kokanee stage and turn red while brown trout grow aggressive and move shallow. Ice-out in spring is excellent for shallow-cruising trout, and summer produces well by trolling deeper for cold-water fish. Across the season, dawn and the last hour of daylight are the most productive windows.

How do you catch kokanee salmon at Dillon?
Trolling at depth is the standard approach. Use downriggers or weighted lines to reach the fish, running small dodgers or flashers ahead of pink or orange hoochies, micro-spoons, or tipped hooks—often baited with scented corn where allowed. Kokanee strike out of reaction, so bright color and tight action matter.

Do you need a license to fish Dillon Reservoir?
Yes. A valid Colorado fishing license is required for anglers of licensing age. Dillon is managed by Colorado Parks and Wildlife, and bag limits, size limits, and special kokanee or trout rules vary and change—always check the current CPW regulations and any reservoir-specific restrictions before fishing.