In Idaho, how old you have to be to buy a gun depends on what you are buying and from whom: at a licensed dealer, you must be at least 18 for a rifle or shotgun and at least 21 for a handgun.1ATF. Minimum Age for Gun Sales and Transfers Idaho does not raise those floors, but it does add its own rules around private sales, minor possession, and penalties that catch people off guard, especially buyers in the 18-to-20 range.
Buying From a Licensed Dealer
Federal law controls the counter at any federally licensed dealer in Idaho. A dealer cannot sell you a rifle or shotgun if you are under 18, and cannot sell you a handgun if you are under 21.2Office of the Law Revision Counsel. 18 U.S. Code 922 – Unlawful Acts Idaho adds no separate state age requirement on top. An 18-year-old buying a shotgun in Boise faces the same age rule as an 18-year-old buying one anywhere else in the country.
The 21-year handgun rule is the one people most often misread. It applies only to purchases from a licensed dealer. Private sales run on a different track.
Private Sales Between Individuals
Idaho does not require background checks for private firearm sales between individuals. Federal and state bans on transferring guns to disqualified people still apply, but no state process forces a private seller to run a check.
Under federal law, a private seller cannot transfer a handgun to anyone the seller knows or reasonably believes is under 18.1ATF. Minimum Age for Gun Sales and Transfers That is three years lower than the dealer floor for handguns. For rifles and shotguns, federal law sets no minimum age on a private transfer.
Idaho layers on a separate rule under Idaho Code 18-3302A: selling a firearm to a minor under 18 without the written consent of a parent or guardian is a crime. Even where no background check is required, a private seller who hands a gun to a 16-year-old without written parental permission has broken state law.
Ammunition Age Limits
Ammunition follows its own age rules, and they trip up buyers more often than you might expect. A licensed dealer cannot sell handgun ammunition to anyone under 21, or rifle and shotgun ammunition to anyone under 18.2Office of the Law Revision Counsel. 18 U.S. Code 922 – Unlawful Acts
The complication is dual-use ammunition. Rounds like .22 LR fire from either a handgun or a rifle. The ATF allows a dealer to sell this type of ammunition to an 18-year-old if the dealer is satisfied it is intended for use in a rifle; if the intended use is a handgun, the 21-year minimum applies.3Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF). Firearms Questions and Answers Expect the dealer to ask.
When Minors Can Possess a Firearm in Idaho
Idaho draws a sharp line between buying and possessing. Minors cannot buy from dealers, but state law lets them possess firearms under specific conditions, and the rules split by weapon type.
General Weapons
Under Idaho Code 18-3302E, a person under 18 can possess a weapon if they have written permission from a parent or guardian, or if a parent or guardian is physically present. Children under 12 face a tighter rule: an adult must accompany them regardless of any written permission.4Idaho State Legislature. Idaho Code 18-3302E – Possession of a Weapon by a Minor Violations are misdemeanors.
Handguns
Idaho Code 18-3302F specifically prohibits anyone under 18 from possessing a handgun, defined as any pistol, revolver, or similar firearm with a barrel no longer than 12 inches, excluding air-powered or pellet guns.5Idaho State Legislature. Idaho Code 18-3302F – Prohibition of Possession of Certain Weapons by a Minor Federal law also bans handgun possession by anyone under 18.2Office of the Law Revision Counsel. 18 U.S. Code 922 – Unlawful Acts An adult who provides a handgun to a minor in violation of the section commits a misdemeanor, though certain violations under subsection (2)(b) are felonies.6ATF. Idaho State Laws and Published Ordinances
The Exceptions
The restrictions in both 18-3302E and 18-3302F drop away in a defined set of situations:7Idaho State Legislature. Idaho Code 18-3302G – Exceptions
- Firing at a lawfully operated target concession where firearms are chained to the counter.
- Attending a hunter’s safety or firearm safety course.
- Practicing or otherwise lawfully using a firearm at an established range or any area where discharge is not prohibited by state or local law.
- Participating in or practicing for an organized shooting competition.
- Being on real property with the owner’s permission and also with permission from a parent, guardian, or property owner to possess a firearm.
The property exception is the one that covers everyday cases like a teenager hunting on family land or a friend’s ranch. Note the dual requirement: the property owner’s permission and a parent’s or guardian’s consent.
Extra Wait for Buyers 18 to 20
Since the Bipartisan Safer Communities Act took effect in 2022, dealer purchases by buyers aged 18 to 20 run through an enhanced background check. The FBI’s National Instant Criminal Background Check System contacts state juvenile justice agencies, mental health repositories, and local law enforcement to look for disqualifying records that would not appear in the standard databases.8Federal Bureau of Investigation. NICS Enhanced Background Checks for Under-21 Gun Buyers Showing Results
If those agencies flag potentially disqualifying information, examiners get up to 10 business days to investigate instead of the standard three-day window.8Federal Bureau of Investigation. NICS Enhanced Background Checks for Under-21 Gun Buyers Showing Results In practice, an 18-year-old buying a rifle in Idaho may wait longer than a 25-year-old making the same purchase. The check is automatic and applies to every dealer sale in that age range.
Buying in Idaho if You Live Out of State
If you live outside Idaho and want to buy from an Idaho dealer, federal law limits what you can walk out with. A dealer can sell a rifle or shotgun to an out-of-state resident as long as the buyer meets the seller in person and the sale complies with the laws of both states.2Office of the Law Revision Counsel. 18 U.S. Code 922 – Unlawful Acts For handguns, a dealer cannot sell directly to an out-of-state buyer. The handgun has to be shipped to a licensed dealer in the buyer’s home state, where the transfer is completed under that state’s rules.
The same federal age floors apply: 18 for long guns and 21 for handguns. Your home state may add restrictions the Idaho dealer must honor.
Concealed Carry Age
Idaho is a permitless carry state, but the age floor depends on where you are. If you are at least 18, a U.S. citizen, and not otherwise disqualified from holding a concealed weapons license, you can carry a concealed weapon outside city limits without any permit.9Idaho Office of Attorney General. Concealed Weapons Inside city limits, the same permitless carry applies to Idaho residents who are 18 or older and meet the same qualifications.
Idaho also issues two licenses for buyers who want formal documentation or reciprocity with other states. The standard license is available to applicants 18 and older who complete an enhanced concealed weapons course and have been Idaho residents for at least six consecutive months. The enhanced license requires the applicant to be at least 21, with no exceptions.10Idaho State Legislature. Idaho Code 18-3302K – Issuance of Enhanced Licenses to Carry Concealed Weapons More states honor the enhanced license through reciprocity, so an 18-to-20-year-old carrying across state lines will need to check whether the destination state recognizes the standard version.
Penalties for Breaking the Age Rules
Most age-related firearm violations in Idaho are misdemeanors, though consequences escalate depending on the circumstances.
A minor who possesses a weapon without parental permission or accompaniment violates 18-3302E, a misdemeanor.4Idaho State Legislature. Idaho Code 18-3302E – Possession of a Weapon by a Minor Under Idaho’s general misdemeanor sentencing rule, that carries up to six months in county jail, a fine of up to $1,000, or both.11Idaho State Legislature. Idaho Code 18-113 – Punishment for Misdemeanor An adult who provides a handgun to a minor in violation of 18-3302F also faces a misdemeanor for most offenses, with certain violations classified as felonies. For weapons on school property, the penalty can reach up to one year in jail and a $1,000 fine.6ATF. Idaho State Laws and Published Ordinances
The most severe exposure comes from federal straw purchase law. An adult who buys a firearm from a dealer on behalf of someone who cannot legally purchase it, including a minor, faces up to 15 years in federal prison. If the firearm is intended for use in a felony, terrorism, or drug trafficking, the maximum climbs to 25 years.12Office of the Law Revision Counsel. 18 U.S. Code 932 – Prohibited Purchases of Firearms A relative who buys a handgun as a favor for an 18-year-old nephew is squarely inside that statute.
Antique Firearms Sit Outside These Rules
Federal gun laws define “firearm” in a way that excludes antique firearms, so the dealer-sale age restrictions above do not apply to them. An antique firearm is any gun manufactured in or before 1898, any non-firing replica of such a gun, or any muzzle-loading rifle, shotgun, or pistol designed for black powder that cannot accept fixed ammunition.13LII / Legal Information Institute. Definition: Antique Firearm from 18 USC 921(a)(16) Idaho does not impose its own separate age requirements for antique firearms or replicas.5Idaho State Legislature. Idaho Code 18-3302F – Prohibition of Possession of Certain Weapons by a Minor When in doubt at a gun show, treat the weapon as a modern firearm.