
Check which species have trophy potential in North Fork Sun River
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North Fork Sun River is a stream located in Teton County, Montana, United States. It is also intersecting with Lewis and Clark County, Montana. It is most popular for fishing Rainbow trout and Brook trout.
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 Rainbow trout as of May 12th, 2026. To view regulations for a different fish species, please click on your preferred species in the drop-down.
Seasons
Bag limit
Aggregate
Special Combined Bag and Length Limits:
Lakes/Reservoirs: 5 daily and 10 in possession, includes cutthroat trout.
Rivers/Streams: 5 daily and in possession, only 1 over 18 inches, only 1 can be a cutthroat trout. All arctic grayling must be released immediately.
For more information please see Montana Fishing Regulations, Central Region
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