Fishing licenses and regulations: how to find your rules

Who needs a fishing license, how to buy one, and how to find the seasons, size limits and bag limits that apply to the water you're fishing.

By the FreeFish team · 3 min read · Updated October 14, 2026

Fishing rules can seem confusing, but they exist for a good reason: to keep fish populations healthy so there are fish to catch next year and for the next generation. Each US state sets its own rules, and individual lakes and rivers can have special regulations on top of statewide ones. Here is how to make sure you are fishing legally.

Important: This page explains how regulations generally work. It does not list specific rules. Seasons, limits and license requirements change regularly and vary by state and by water. Always check your state's current official regulations before you fish.

Do I need a fishing license?

In most states, yes, if you are above a certain age. That age is often 16, but it varies. Licenses are typically required whether you fish from a boat, a dock or the shore. Common exceptions include:

Children below the state's age requirement.
Free fishing days or weekends, when residents and visitors can fish without a license.
Certain private ponds, depending on the state.
Some discounts or exemptions for seniors, veterans, active military or people with disabilities.

Visitors from other states usually need a non-resident license. Short-term licenses (one day, three days or a week) are often available for travelers.

How to buy a license

Go to your state's fish and wildlife agency website. It may be called the Department of Natural Resources (DNR), the Fish and Wildlife Commission, Game and Fish, or Parks and Wildlife.
Look for "Buy a license" or "Licenses and permits".
Choose your license type (resident or non-resident, annual or short-term).
Check whether you need any extra stamps or endorsements, such as a trout stamp or a Great Lakes endorsement, for the fishing you plan to do.
Keep the license on your phone or printed with you while fishing.

Make sure you are on the official state agency site, usually ending in .gov or linked from it. Some third-party sites charge extra fees.

The rules to look up

Regulations are usually published as a free online guide or booklet each year. When you look up a water, check:

Seasons: when you can fish for or keep a species. Some species have closed seasons, often during spawning.
Daily bag (creel) limits: how many of a species you can keep per day.
Possession limits: how many you can have in total, including fish in your freezer at home, in some states.
Size limits: minimum lengths, maximum lengths, or "slot limits" where fish within a certain range must be released.
Gear restrictions: limits on the number of lines or hooks, artificial lures only, or barbless hooks.
Bait rules: restrictions on live bait, moving minnows between waters, or using certain species as bait.
Special regulations for specific lakes, rivers or stretches of stream.

How to measure a fish

Most states measure total length: lay the fish flat on a ruler or measuring board with its mouth closed, and measure from the tip of the snout to the tip of the tail, often with the tail lobes squeezed together. Your state's guide explains exactly how it measures. A measuring board or a sticker ruler on your boat makes this quick.

Help stop invasive species

Aquatic invasive species such as zebra mussels and invasive plants spread from lake to lake on boats, trailers and gear. Many states require you to:

Clean plants, mud and animals off your boat, trailer and gear.
Drain all water from your boat, live well, bilge and bait buckets before leaving the access.
Dry or dispose of unwanted bait in the trash, never in the water.

Fish consumption advisories

If you plan to eat your catch, check your state's fish consumption advisory. It recommends how often it is safe to eat certain species and sizes from specific waters because of contaminants like mercury and PCBs. Advisories are especially important for children and for people who are pregnant or may become pregnant.

Where FreeFish fits in

FreeFish shows lakes, rivers, depth maps and species information to help you plan, but it is not a source of official regulations. For the final word on what is legal, always use your state agency's current regulations. When in doubt, release the fish.