
Ever wondered how long you can store ammo before it becomes unreliable or unsafe to use? You’re not alone. Many firearm owners assume that ammunition lasts forever — but in reality, improper storage can shorten its life, reduce accuracy, and even make it dangerous to shoot.
Ammunition, like any other material, reacts to its environment. Heat, humidity, and air exposure can degrade the powder and primer over time. But when stored correctly, ammo can last decades — even half a century — and still perform flawlessly.
At Alpine Safes, a trusted online safe retailer based in New York City, we believe safe storage isn’t just about protecting valuables — it’s about ensuring safety, reliability, and peace of mind. Whether you’re a sports shooter, security professional, or firearm enthusiast, understanding the science behind ammo longevity is the first step toward responsible ownership.
How Long Can You Store Ammo?
The simple answer is: a very long time — if done right.
Under ideal storage conditions, most ammunition can last 20 to 50 years or more. That means rounds manufactured in the 1980s can still perform like new today if properly preserved.
However, longevity depends on several key factors such as temperature, humidity, and exposure to air. Poorly stored ammo can degrade in as little as a few years, leading to misfires, jams, and inconsistent performance.
Average Shelf Life by Ammunition Type

- Centerfire Ammo (e.g., 9mm, .223, .308): 20–50 years with proper care.
- Rimfire Ammo (e.g., .22LR): 10–25 years due to thinner casing walls.
- Shotgun Shells: 10–20 years, depending on the quality of plastic and brass.
- Military Surplus Ammo: Often sealed with lacquer and can last up to 70 years if kept dry.
The takeaway: ammo doesn’t expire on a date — it expires with neglect.
What Shortens Ammo Lifespan?
Even the most expensive ammunition is vulnerable to environmental stress. Let’s break down the key enemies of ammo longevity:
1. Temperature Extremes
Ammunition performs best at stable, moderate temperatures.
Excessive heat can cause chemical breakdown in propellants, while cold can make primers brittle. Consistent temperature between 55°F and 70°F (13–21°C) is optimal.
Never store ammo in your car, attic, or garage — these areas experience rapid temperature swings that can ruin your rounds faster than you think.
2. Humidity and Moisture
Humidity is ammo’s silent destroyer. Even a little moisture can lead to rust, corrosion, or primer failure. Store ammo in airtight containers or safes with desiccant packs to keep moisture levels between 40–50% RH (relative humidity).
If you live near the coast or in humid regions like Florida or the Northeast, a dehumidifier inside your safe is a must-have.
3. Light Exposure
UV rays can weaken plastic shell casings and heat metal surfaces unevenly. Keep ammo in dark or shaded areas, ideally in sealed containers or safes that block out light completely.
4. Air and Contaminants
Air introduces oxygen and pollutants that oxidize brass and steel. This leads to discoloration, pitting, or surface corrosion — early signs that your ammunition is compromised.
5. Handling and Oils
Your hands naturally contain oils and acids that corrode metals over time. Always handle ammunition with clean, dry hands or gloves when organizing or inspecting rounds.
Best Practices for Long-Term Ammo Storage
1. Store Ammo in a Fire-Resistant Safe
An ammo safe is the most effective way to protect your rounds from fire, humidity, and theft.
Unlike plastic boxes, ammo safes are airtight, fire-rated, and tamper-proof. Many are equipped with gasket seals and moisture control systems that maintain a stable environment inside.
For homes and businesses, an ammo safe provides both safety and compliance, especially in states like New York that have firearm and ammunition storage regulations.
2. Use Desiccants and Dehumidifiers
Silica gel packets and electric dehumidifiers absorb excess moisture, keeping your storage environment dry. Replace or recharge them regularly to ensure maximum protection.
3. Label and Rotate Your Stock
Use the First In, First Out (FIFO) system — shoot older ammo first. Label each box with its purchase or manufacturing date and store new ammo at the back. This simple method prevents waste and helps you track performance.
4. Keep Ammo Separated
Never store ammo with cleaning chemicals, oils, or solvents. These substances emit vapors that can damage primers or powder. Store ammo separately from firearms, and ideally in a dedicated compartment or safe.
5. Inspect Ammo Regularly
Every six months, open your storage and check for corrosion, discoloration, or deformities. Dispose of compromised rounds safely through a local police or hazardous waste program — never throw them in the trash.
Why Proper Ammo Storage Matters
1. Safety Above All
Unsecured ammunition poses risks, especially in households with children. A locked safe prevents unauthorized access and accidental discharges.
2. Financial Protection
Ammunition is expensive — and rising in cost. Proper storage protects your investment and ensures you always have reliable rounds on hand without wasting money on replacements.
3. Legal Compliance
Many U.S. states, including New York, have specific firearm and ammunition storage requirements. Storing ammo safely ensures compliance and can even reduce liability in the event of theft or misuse.
4. Performance and Accuracy
A well-preserved round fires consistently, maintaining accuracy and power. Poorly stored ammo, on the other hand, can misfire, jam, or cause dangerous pressure spikes inside your firearm.
Common Mistakes in Ammo Storage

- Storing in a Garage or Shed: These areas are prone to extreme temperature and moisture fluctuations.
- Using Plastic Bags or Bins: These trap condensation and lead to rust.
- Mixing Ammo Types: Mixing calibers or brands can cause confusion and safety hazards.
- Ignoring Expiry Signs: Any sign of corrosion, tarnish, or smell of solvent means the round is no longer safe.
- Neglecting Fire Protection: A fire-rated safe can prevent dangerous ammo ignition during house fires.
How Ammo Storage Mirrors Smart Business Strategy
At Alpine Safes, we often compare firearm care to running a successful business. The same principles of protection, organization, and consistency apply:
- Your Safe = Your Website: It safeguards your most valuable assets — your brand and your reputation.
- Your Ammo = Your Marketing Content: Organized, well-maintained, and ready for action when needed.
- Your Locks = SEO and Security: Strong systems keep your business protected and visible.
- Your Maintenance Routine = Digital Consistency: Just as safes need care, your online presence needs regular updates.
Whether you’re protecting firearms or promoting your brand online, the right systems ensure long-term success.
Choosing the Right Safe for Long-Term Ammo Storage
When selecting an ammo safe, here’s what to prioritize:
- Fire Rating: Choose safes tested to endure 1,200°F–1,700°F for at least an hour.
- Seal Quality: Rubber gasket seals provide airtight and watertight protection.
- Material Strength: Go for heavy-gauge steel (at least 10–12 gauge) with reinforced doors.
- Lock Type: Electronic keypads offer speed; combination and biometric locks offer control.
- Anchoring Options: Bolt-down capability prevents theft or tipping.
- Capacity: Choose a safe with adjustable shelving to store multiple calibers, magazines, or accessories.
Maintenance Tips for Ammo Safes
Even the best safes need occasional care:
- Wipe Interiors Monthly: Prevent residue buildup.
- Lubricate Locks: Use non-corrosive oil to keep locking mechanisms smooth.
- Monitor Humidity Levels: Keep it between 40–50%.
- Replace Dehumidifiers: Recharge silica packs or maintain electric units regularly.
- Update Codes or Keys: Change access combinations every few months for added security.
How Can Alpine Safes Help You
At Alpine Safes, we believe in protection built to last. Whether you’re safeguarding firearms, cash, documents, or ammunition, our ammo safes offer top-tier performance, durability, and peace of mind.
Why Choose Alpine Safes:
- Premium Quality Safes: Fire-rated, burglary-resistant, and moisture-controlled.
- Extraordinary Sale Prices: Get professional-grade protection without breaking your budget.
- Expert Advice: Our specialists guide you through choosing the right safe for your needs.
- Fast Nationwide Delivery: Quick, secure shipping to anywhere in the U.S.
- Versatility: Perfect for home use, shooting ranges, law enforcement, and security businesses.
Your ammo deserves the same level of care as your firearm — and that starts with proper storage.
Visit AlpineSafes.com today to explore our full range of ammo safes, and discover how secure, organized storage can protect your investment for decades.
Because with Alpine Safes, your safety — and your ammunition’s reliability — will always come first.
Frequently Asked Questions
- Does ammunition go bad if it’s stored in a car or garage?
Yes. Cars and garages experience extreme temperature swings and humidity, which can quickly degrade gunpowder and primers, making ammo unsafe to fire.
- Can old or corroded ammunition be reloaded safely?
It’s not recommended. Corrosion can weaken the casing and alter powder consistency, which may lead to dangerous misfires or gun malfunctions during reloading.
- How do the military or police store their ammunition long-term?
They use climate-controlled armories and sealed metal containers to maintain consistent temperature and humidity levels, ensuring reliability for decades.
- Is vacuum-sealing ammo a good long-term storage method?
Yes, vacuum sealing can extend ammo life by eliminating air and moisture exposure — but it should always be paired with cool, dark, and stable environmental storage.








