Colorado Ammunition Age 21 Law (HB25-1133) Effective July 2026

Colorado Ammunition Age 21 Law (HB25-1133) Takes Effect July 1, 2026

Colorado now requires buyers to be 21 to purchase most firearm ammunition. HB25-1133 took effect July 1, 2026, adding age checks, vendor-assisted sales, and age-verified delivery. The bottom line: ammunition sales in Colorado follow new rules statewide.

Information last verified on July 2, 2026. This is a developing story; we update it as the record changes.

Status: Signed into law; effective July 1, 2026.

Jurisdiction scope: This article covers Colorado only. It addresses the sale, delivery, and age-verification rules for firearm ammunition under HB25-1133, not firearm purchases or possession generally.

What Happened

Colorado's ammunition-sales law, HB25-1133, took effect on July 1, 2026. The measure was passed during the 2025 legislative session and signed by Governor Jared Polis, with lawmakers setting a delayed effective date so retailers could prepare.

The law raises the minimum age to purchase firearm ammunition at retail to 21. Before the change, ammunition purchases in Colorado generally followed the federal floor rather than a uniform state age of 21.

HB25-1133 also changes how ammunition reaches buyers. Retailers must sell ammunition only with the assistance of a vendor, and they must verify the buyer's age using a valid government-issued photo ID. For shipped orders, the law requires an age-verified delivery process.

According to the bill's text and public summaries, the law carries a tiered penalty. An unlawful sale that violates the age or access requirements is a civil infraction, and a second or subsequent violation becomes a class 1 misdemeanor.

What the Law Actually Says

Under HB25-1133, a retail ammunition vendor may not sell ammunition to a person younger than 21. The seller must verify age with a valid government-issued photo identification at the point of sale.

The law also restricts how stores display ammunition. Retailers must keep ammunition accessible only with vendor assistance, such as behind a counter or in an enclosed display case, rather than on open shelves that customers can reach without help.

For deliveries, the law requires the vendor to use a delivery service that verifies the recipient is 21 or older. The person receiving the package must show identification and provide written acknowledgment of receipt.

Public summaries of the bill describe several exceptions to the age-21 purchase rule. Reported exceptions include in-person sales to people ages 18 to 20 who use the ammunition on-site at a shooting range, members of the military and veterans, holders of a hunter-education certificate, people protected by a protection order, and people born on or before a specified date. Sources also report an exception for rimfire ammunition and for sales to on-duty peace officers.

These rules sit alongside Colorado's broader firearm framework. For related context, see our overview of Colorado self-defense and gun laws, our national guide to self-defense laws by state, and our explainer on Colorado background check rules for firearm transfers.

Analysis: Why This Matters

The following is analysis from the Recording Law Editorial Team.

HB25-1133 shifts the point-of-sale process for ammunition in Colorado in ways that reach both buyers and sellers. The age-verification and vendor-assistance requirements move ammunition off self-service shelves and place a documentation step on every retail transaction, including shipped orders.

The law is part of a broader state trend. Several states have enacted age or verification rules for ammunition sales in recent years, and reporting notes that similar age-based firearm and ammunition laws have drawn legal challenges in other jurisdictions. We note that context neutrally; the outcome of any such litigation in Colorado or elsewhere is not something we predict here.

For retailers, the practical questions center on display setup, ID checks, staff training, and delivery logistics that verify a recipient's age. For buyers, the immediate change is the age threshold and the exceptions the statute recognizes. Because the exceptions are specific and fact-dependent, the exact application will turn on the statutory text and any implementing guidance.

How This Affects You

If you buy ammunition in Colorado, expect to show a valid government-issued photo ID and to ask a store employee for assistance, since ammunition is no longer sold from open self-service racks. If you are between 18 and 20, whether you can buy will depend on whether one of the statute's exceptions applies to your situation.

If you sell or ship ammunition to Colorado customers, the law affects how you display product, verify age, and handle deliveries. Shipped orders require a delivery process that confirms the recipient is 21 or older and captures written acknowledgment of receipt.

This is general information about the statute, not advice about any individual transaction. Because the exceptions and penalty tiers are specific, confirm the current statutory text before relying on any single provision.

This is general legal information, not legal advice. It covers Colorado law and reflects sources verified on July 2, 2026. Laws change and this story is developing; consult a lawyer licensed in your jurisdiction about your specific situation.

Sources

• Colorado General Assembly, HB25-1133: Requirements for Sale of Firearms Ammunition (leg.colorado.gov)
• Colorado General Assembly, HB25-1133 Fiscal Note (Legislative Council Staff) (leg.colorado.gov)
• Colorado House Democrats, Joint Release: Laws to Create Safeguards on Ammunition Purchases Go into Effect (cohousedems.com)
• Colorado Politics, July 1 brings new Colorado rules on gun ammo (coloradopolitics.com)
• KDVR, In 2026, Coloradans will need a retailer's help to access ammunition in stores (kdvr.com)

Related articles

• Colorado self-defense and gun laws
• Self-defense laws by state
• Colorado background check rules

Last updated: 2026-07-02. This is a developing story; details verified as of 2026-07-02.

Frequently Asked Questions

What is Colorado HB25-1133?

HB25-1133 is a Colorado law governing the retail sale of firearm ammunition. It sets a minimum purchase age of 21, requires vendor-assisted sales and photo-ID age verification, and requires age-verified delivery for shipped ammunition. It took effect July 1, 2026.

When did the Colorado ammunition law take effect?

HB25-1133 took effect on July 1, 2026. The bill was passed and signed in 2025 with a delayed effective date so retailers could prepare to comply.

What is the minimum age to buy ammunition in Colorado now?

The minimum age to purchase firearm ammunition at retail is 21, subject to the exceptions the law recognizes.

Are there exceptions to the age-21 rule?

Public summaries report exceptions including buyers 18 to 20 who use ammunition on-site at a shooting range, active military and veterans, hunter-education certificate holders, people protected by a protection order, people born on or before a specified date, on-duty peace officers, and rimfire ammunition. Whether an exception applies depends on your specific situation and the statutory text.

Can ammunition still be sold from open store shelves in Colorado?

No. The law requires that ammunition be accessible only with vendor assistance, such as behind a counter or in an enclosed display, rather than on open self-service racks.

How does the law handle shipped or delivered ammunition?

For shipped orders, the vendor must use a delivery service that verifies the recipient is 21 or older. The recipient must show identification and provide written acknowledgment of receipt.

What are the penalties for violating the law?

An unlawful sale that violates the requirements is a civil infraction. A second or subsequent violation is a class 1 misdemeanor, according to the bill's text and public summaries.