
Check which species have trophy potential in Halfmoon Lake
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Halfmoon Lake is a lake located in Flathead County, Montana, United States. It is most popular for fishing Largemouth bass, Yellow perch, and Pumpkinseed.
Learn what time of year and day to go fishing at Halfmoon Lake. Download Fishbrain today to look for new fishing spots, scout new fishing access, or prep for your next trip.

Disclaimer: Always check local fishing regulations, water access rights and land ownership before fishing, regardless of any catches logged in that area by the Fishbrain community. Fishbrain has mapped millions of acres of government-owned land across the USA to help you identify potential fishing access, but you are responsible for ensuring compliance with all legal requirements.
Fishing regulations in Montana can change throughout the year. Make sure to check this page before fishing for the most up to date rules and regulations for the current season. Local regulations govern when you can fish, the max size of the fish you can keep, how many fish you can keep, and more.
Below you will see fishing regulations for catching Largemouth bass as of April 2nd, 2026. To view regulations for a different fish species, please click on your preferred species in the drop-down.
Seasons
Bag limit
Min size
Measurement
Seasonal bag and length limit:
5 daily and in possession, only 1 greater than 12 inches. Third Saturday in May through June 30: 1 daily and in possession, must be over 22 inches.
For more information see Montana Fishing Regulations, Western Region
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