Fishing Jasper Lake in Boulder County, Colorado

• Overview

  Jasper Lake lies in Boulder County, in Colorado. The surface lies 10,837 feet up. Surface area runs to about 19 acres — small enough to read in one session. Nederland sits 8.1 miles from here and is the nearest stop. Fraser follows at 8.5 miles, then Coal Creek at 16 miles. The line between counties passes nearby, which can change who manages the water.

• Where to Fish on Jasper Lake

  The records we hold are silent on depth, so plan to find it yourself. A natural lake fishes on cover, and cover here means weed and timber. Look for the band where the shallows give up and the bottom falls away. Across Boulder County, recorded fish include black-spotted cutthroat trout, brook trout, brown trout, bluegill and rainbow trout. The county figures include rivers and lakes alike. Fish Jasper Lake where the bottom changes rather than where it looks deep.

• Seasonal Patterns

  Averages here run 54°F at the top of summer and 20°F at the bottom of winter. Seasons are distinct, and each one fishes differently. The open season starts with the thaw, near enough mid May. On the long-run averages the water opens up around mid May and starts locking again about mid November. June through September is the settled part of the year, with the shoulders busier for fish. Time your trip to Jasper Lake by conditions rather than dates.

• Tackle & Baits

  Nothing in our records says who may fish here. Access points are not mapped for this water, which suits people who like quiet. Trout here take small spinners, spoons and, where fly water allows, a nymph or dry. Ask in the nearest town if you are unsure. Close seasons apply to some species and not others. Storm Lake, 0.7 miles away, makes the obvious fallback. What applies at Jasper Lake may have changed since it was mapped.