Fishing at Peterson Lake, Ravalli County, Montana

• Overview

  Peterson Lake is a Ravalli County water, Montana side. The water sits 6,493 feet up. This is a pocket water of some 20 acres, and every part of it is reachable from the bank. Some 11 miles away sits Stevensville, the nearest settlement. Further out sit Lolo (11 miles) and Orchard Homes (18 miles). No border sits close enough to matter.

• Where to Fish on Peterson Lake

  Depth remains unrecorded, so treat the first session as a survey. A soft bed grows weed late into autumn, which keeps fish shallow. This is a lake, so the margins and the first drop matter most. Across Ravalli County, recorded fish include 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. On Peterson Lake that means starting tight and working out.

• Seasonal Patterns

  The seasonal spread runs 19°F to 55°F. A solid cap is the normal state through winter. The lid usually sets by midwinter and gives way around early May. The open-water window runs from around early May to about mid November in an average year. The strongest runs come at either end of the open season. The season on Peterson Lake follows the weather closely.

• Tackle & Baits

  Our records carry no access rule either way. There is no recorded infrastructure here; expect to find your own way in. For the trout, small spinners and a box of nymphs cover both approaches. Check locally before you travel, because a wasted drive is a long one. Rules for boats are stricter than rules for the bank in many places. The nearest alternative is Duffy Lake, 1.2 miles out. Treat Peterson Lake as unsettled until someone local tells you otherwise.