Boulder Lake Fishing Guide, Ravalli County, Montana

• Overview

  Boulder Lake is listed under Ravalli County, Montana. It sits at 7,093 feet above sea level. At about 29 acres, a day is enough to walk the shoreline properly. About 1.0 miles of bank, so nothing stays unexplored for long. Size puts it in the front rank of our Ravalli County list. The nearest town is Hamilton, 29 miles away. For a city, Boise is 179 miles off. No border sits close enough to matter.

• Where to Fish on Boulder Lake

  Depth is unknown to us, and the shoreline is the better guide. Bays and points beat straight shoreline every time on water like this. Still water like this holds fish on the edges rather than out in the open. Records held for Ravalli County cover rainbow trout, cutthroat trout and brook trout. At least one recorded species is protected in parts of its range; read the local rules before targeting anything. Boulder Lake gives up its fish to patience rather than distance.

• Seasonal Patterns

  Seasonal averages run from 17°F in December up to 52°F in July. A hard winter is normal, and the thaw brings a strong few weeks. Ice is part of the season here, ending near late May. Averages suggest open water from about late May through to roughly early November. Right after break-up, and again as the nights sharpen, is when to go. The season on Boulder Lake rarely departs from it.

• Tackle & Baits

  There is no clear statement anywhere on who can fish it. Records list it as a natural water body rather than an impoundment. Mapping is blank for access, so scout the approach before committing the car. For the trout, small spinners and a box of nymphs cover both approaches. Where a permit is needed, the nearest town usually sells it. Fishing rules and camping rules are set separately here. Failing this one, try Lake Crystal, 0.6 miles away. For Boulder Lake, the notice at the access point is the final word.