Granby Lake, CO

About Granby Lake

Lake Granby is one of Colorado's premier high-country reservoirs, sprawling across roughly 7,000 surface acres at about 8,280 feet of elevation on the western edge of Rocky Mountain National Park, near the town of Granby in Grand County. As the second-largest body of water in the state, it sits within the Colorado-Big Thompson water project and is part of a chain that includes nearby Shadow Mountain Reservoir and Grand Lake. Its deep, cold, blue water, sweeping mountain backdrop, and reputation as a destination cold-water fishery draw anglers from across the Front Range and beyond.

Granby is best known as a coldwater trout and salmon lake, and it has earned a particularly strong reputation for big lake trout (mackinaw) along with a productive kokanee salmon fishery. Cool summers, a long ice season, and abundant baitfish help grow fish to impressive sizes, making it as much a trophy-hunting destination as a numbers lake.

Fish Species

Granby supports a classic Rocky Mountain coldwater mix, with several species that draw the most attention:

• Lake trout (mackinaw) — the marquee fish here. Granby produces both eating-size lakers and genuine trophies, with the biggest fish feeding heavily on the abundant forage base. This is one of the better-known mackinaw fisheries in the state.
• Kokanee salmon — a landlocked sockeye prized for the table and for fast trolling action. They run in schools and turn brilliant red in the fall as they stage to spawn.
• Rainbow trout — common and widely distributed, providing reliable action for bank and boat anglers alike.
• Brown trout — present and grow well in the cold water, often holding near structure and tributary mouths.

Anglers may also encounter other coldwater species and the occasional incidental catch, but lake trout and kokanee are the true standouts that define Granby's reputation.

Best Seasons & Times

Spring (ice-out into early summer): As the ice retreats, lake trout move shallow to feed and become accessible to anglers casting and trolling along points, rocky shorelines, and drop-offs. This is one of the best windows of the year to target big lakers in relatively shallow water. Rainbows also feed actively near shore as the water warms.

Summer: As surface temperatures climb, lake trout and kokanee push deep, suspending over and along the basin and main-lake structure. This is prime time for downrigger trolling. Early morning and evening are most productive, with midday fishing requiring you to get baits down into the cold layers where the fish hold.

Fall: Kokanee stage and color up as they prepare to spawn, often concentrating near tributary areas and providing exciting action. Cooling water also brings lake trout back toward shallower structure as they feed up before winter. Cool, stable fall days can be excellent.

Winter (ice fishing): Granby is a well-known hardwater destination. Once safe ice forms, anglers drill over points and humps for lake trout, jig for trout, and target other species through the ice. Always confirm ice conditions locally before heading out. Across all seasons, low-light periods at dawn and dusk tend to fish best.

Techniques & Baits

Lake trout: Trolling is the go-to method through much of the open-water season. Use downriggers or lead-core line to present spoons, large minnow-imitating crankbaits, and tube jigs at depth. In spring and fall when fish are shallower, casting and slow-trolling along rocky points and breaklines is very effective. Vertical jigging with heavy tube jigs and spoons tipped with cut bait works well over deep structure and is a staple through the ice.

Kokanee: These fish are caught almost exclusively by trolling. Run small, flashy dodgers or flashers ahead of pink/orange/chartreuse hoochies, squids, or small spoons, often tipped with shoepeg corn (frequently scented). Vary your trolling depth until you locate the schools, then keep returning to that depth.

• Bright pink, orange, and chartreuse are reliable kokanee colors.
• Spoons and tube jigs in white, chartreuse, and natural baitfish patterns produce lake trout.
• For rainbows and browns from shore, PowerBait, nightcrawlers, and small spinners or spoons are dependable; fly anglers can do well with streamers and nymphs near inlets and along shorelines.

A quality fish finder is a major advantage here for locating bait, structure, and the depth where fish are holding.

Access & Launches

Lake Granby offers good public access for both boaters and shore anglers. The reservoir is managed within the Arapaho National Recreation Area, and there are developed public boat ramps and campgrounds around the lake, along with stretches of accessible shoreline for bank fishing. Because it is a popular and developed recreation area, expect day-use and recreation-area fees in season, and note that facilities, ramp availability, and lake levels can change. Boaters should be prepared for aquatic nuisance species (ANS) inspection requirements that are common on Colorado waters. The lake's size and high-country weather mean conditions can change quickly, so plan for wind and cold, and check current local conditions and any closures before your trip.

Regulations & Licenses

A valid Colorado fishing license is required for all anglers of licensing age, and you should carry it while fishing. Granby is managed by Colorado Parks and Wildlife, and regulations — including bag, possession, and size limits, as well as any gear or bait restrictions and special rules that may apply to lake trout or kokanee — can vary and change from year to year. Snagging seasons or special provisions sometimes apply to kokanee on certain Colorado waters during the fall. Always review the current CPW fishing regulations and any water-specific rules before you go, and confirm ice-fishing and boating requirements (including ANS inspection) in season.

Frequently Asked Questions

What is the best fish to catch at Lake Granby?
Granby is best known for its lake trout (mackinaw), which include both eating-size fish and genuine trophies, as well as a popular kokanee salmon fishery. Rainbow and brown trout round out the catch.

When is the best time to fish Lake Granby?
Spring at ice-out and fall are prime for lake trout as they move shallow, while summer is best for deep trolling for lakers and kokanee. Kokanee color up and concentrate in fall, and the lake is a well-known ice-fishing destination in winter. Dawn and dusk are the most productive times of day.

How do you catch lake trout at Granby?
Trolling spoons, large crankbaits, and tube jigs with downriggers or lead-core line is the main open-water method, with casting and slow-trolling along rocky points effective in spring and fall. Vertical jigging heavy tubes and spoons, often tipped with cut bait, works over deep structure and through the ice.

Do I need a license to fish Lake Granby?
Yes. A valid Colorado fishing license is required for anglers of licensing age. Bag, size, and possession limits are set by Colorado Parks and Wildlife and can change, so check the current state regulations and any water-specific rules before fishing.