Diamond Lake Fishing in Madison County, Montana

• Overview

  The Madison County end of Montana holds Diamond Lake. Elevation runs to 8,934 feet. Surface area runs to about 16 acres — small enough to read in one session. Few waters listed in Madison County are bigger. Nearest place of any size is Big Sky, 7.6 miles away. Four Corners follows at 20 miles, then Bozeman at 25 miles. One jurisdiction covers this water end to end.

• Where to Fish on Diamond Lake

  Depth figures are not published for this one. Where the bottom changes texture, fish gather; find that line. Weed, then depth: that is the order to fish a water of this kind. Public occurrence data for Madison County names rainbow trout, brown trout and mountain whitefish. The list covers the county rather than this water alone, so treat it as a guide. The shape of Diamond Lake decides where the fish sit.

• Seasonal Patterns

  The range across the year is 17°F to 52°F. The season turns properly here, and fish follow it closely. The lid usually goes in late May, which opens the strongest weeks of the year. The season between ice runs from about late May to early November. June through September is the settled part of the year, with the shoulders busier for fish. Time your trip to Diamond Lake by conditions rather than dates.

• Tackle & Baits

  We have no record of the rules that apply on this bank. Access is unmapped, which usually means a farm track and a walk. Light line and small metal for the trout; a fly rod earns its place on calm evenings. Bank access can be seasonal on ground like this. Where the way in crosses private ground, ask first. Chilled Lakes sits 1.6 miles off and takes the overflow. Where Diamond Lake is concerned, a local answer beats a written one.