Surprise Lake in Park County: How and When to Fish It

• Overview

  Surprise Lake is a Park County water, Montana side. This is pine and birch ground. Small at around 3 acres: two anglers spread out cover most of it. It is one of the smaller waters we list in Park County. Nearest place of any size is Red Lodge, 29 miles away. It is 81 miles to Billings, the nearest city. It lies deep inside the county rather than near an edge.

• Where to Fish on Surprise Lake

  Depth is unmeasured here, so let the shoreline guide you. Look for the band where the shallows give up and the bottom falls away. A natural lake fishes on cover, and cover here means weed and timber. Fish documented in Park County include rainbow trout, brook trout and california golden trout. Records at this level tell you what is in the area. Treat Surprise Lake as a water to read rather than to cover.

• Seasonal Patterns

  Averages move between 13°F in January and 47°F in August. Fishing here follows the temperature more than the calendar. Ice fishing carries the winter, and the water opens about mid June. On average, mid June opens the water and late October closes it again. The shoulder weeks of the open season are the productive ones. Surprise Lake fishes to that pattern most years.

• Tackle & Baits

  The rules here are undocumented as far as public sources go. Public mapping records no formal access here, so plan for a walk and soft ground. For the trout, small spinners and a box of nymphs cover both approaches. State or provincial rules still apply whatever the bank status. Night access is frequently treated as a separate matter. Weasel Lake sits 0.2 miles off and takes the overflow. Treat Surprise Lake as unsettled until someone local tells you otherwise.