Short answer: No — unless you fall into a narrow exception, Colorado now requires you to be 21 years old to purchase ammunition.
Colorado’s New Ammunition Age Law
Historically, federal law split the rules:
- Handgun ammo – must be 21+ to buy from a dealer.
- Rifle/shotgun ammo – could be bought at 18+.
Colorado used to follow this model, but that changed with House Bill 25-1133, which took effect in 2025. Now, all ammunition sales require the buyer to be 21 years old — whether it’s for a handgun, rifle, or shotgun.
Exceptions for 18- to 20-Year-Olds
The law provides a few narrow carve-outs:
- Active-duty military or honorably discharged veterans
- Hunter education certificate holders
- Born on or before January 28, 2007 (grandfather clause that expires in 2028)
- On-site range use — you can buy ammo for immediate use at a shooting range
If you don’t meet one of these criteria, you can’t legally purchase ammunition in Colorado until you turn 21.
Legal Challenges & Court Rulings
Pro-gun organizations, including Rocky Mountain Gun Owners, quickly challenged the law.
So far, both the 10th Circuit Court of Appeals and Chief U.S. District Judge Philip Brimmer have allowed it to remain in effect, ruling that the age restriction does not violate the Second Amendment. Many in the firearms community disagree, arguing that this is another unnecessary law targeting law-abiding young adults rather than criminals.
Why This Law Matters to Gun Owners
For decades, an 18-year-old in Colorado could buy rifle or shotgun ammo for hunting, sport shooting, or defense. Now, unless you fall under an exception, you’re out of luck until 21. Critics argue this treats legal adults like second-class citizens, while doing nothing to address actual criminal misuse of firearms.
Relevant Colorado Statute
- Colorado Revised Statutes, HB25-1133 (2025) – Establishes the 21-and-over ammunition purchase requirement, exceptions, and penalties for violations.
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