Gear & Supplies
How Long Does Gasoline Last? How to Store Fuel for Emergencies
General information only, not professional advice. In an emergency, call 911 and follow local officials. How we use sources
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In this guide
Gasoline kept in a sealed container at typical outdoor temperatures stays within US fuel standards for “at least a year,” according to a study sponsored by the U.S. Department of Energy. Store it outside living areas, in a safety container made for it. We found no federal shelf-life number for diesel, kerosene or propane.
Most families think about food, water and shelter long before fuel. Then a storm takes the power out and a generator, a camp stove or a heater suddenly matters. This page sticks to what federal and fire-safety agencies say about how long gasoline lasts and where to keep fuel, quotes their words, and says plainly where they give no number. Follow your local fire department and emergency officials over anything here, call 911 in an emergency, and when in doubt, don’t store it.
How long does gasoline last?
The website fueleconomy.gov, run for the U.S. Department of Energy and the EPA, addresses the “goes bad in a few months” idea directly:
Gasoline will “go bad” after a few months unless you use a fuel stabilizer.
FACT: A study sponsored by the US Department of Energy has shown that, when stored in a sealed container at typical outdoor temperatures, gasoline will stay within the ATSM [sic] standards for gasoline sold in the US for at least a year. Aftermarket additives can increase oxidation stability, but they are not necessary for gasoline stored under typical conditions for less than 12 months.
Source: U.S. Department of Energy and EPA, Fuel Economy Myths and Misconceptions (fueleconomy.gov), accessed November 2026.
That is the only federal number we found for any fuel, and it comes with conditions: a sealed container, typical outdoor temperatures, and a year. The page does not say how the answer changes for hot garages, for ethanol blends or for fuel that is already old when you buy it, so we do not guess. You will see “3 to 6 months” in many guides online. We could not trace that figure to a federal source, so we do not repeat it as a rule.
Our own suggestion, not an agency’s: write the fill date on the can in marker, and plan to use the fuel and refill within a year.
How long does each fuel last, and where does it go?
“Typical shelf life” is the column most guides fill in with confident numbers. Here it holds only what we could trace to an authority.
| Fuel | How long it lasts | Container | Where to keep it |
|---|---|---|---|
| Gasoline | At least a year sealed at typical outdoor temperatures (DOE-sponsored study, fueleconomy.gov) | A container sold for gasoline, tightly capped, with a child-resistant closure (NFPA, CPSC) | Outside living areas (CPSC). NFPA lists an outbuilding, a detached garage or an outdoor shed; the CPSC says not in a garage where vapors could be ignited. Ask your fire department |
| Diesel | No federal number found. Follow the label and your equipment manual | Original or properly labeled container, never glass (NFPA, CPSC) | Outside living areas. Diesel is not named on the federal pages we read, so ask your fire department |
| Kerosene | No federal number found. Follow the label and the heater manual | Original container or a properly labeled non-glass safety container (NFPA, CPSC) | Outside living areas, away from fuel-burning appliances (CPSC) |
| Propane | No federal number found. Follow the cylinder label and the maker’s instructions | The cylinder it came in; inspect it per the maker | Outside living areas, away from fuel-burning appliances (CPSC). Ask your fire department about distances; NFPA publishes a fact sheet on placing LP-gas containers. If you smell gas, get everyone outside and call 911 or your gas supplier from outside |
If a row says “no federal number found,” that is a finding, not a gap we filled with a guess. If you have a number from a maker, use theirs.
Where should you store gasoline?
The National Fire Protection Association (NFPA), a fire-safety nonprofit, recommends using only a container sold for gasoline and keeping it tightly capped. It says never to keep gasoline containers in a basement or in the lived-in part of a building, and to keep them in an outbuilding, a detached garage or an outdoor shed instead. (Our summary of NFPA’s Safety with Oily Rags tip sheet, accessed November 2026.)
The Consumer Product Safety Commission is stricter about the garage:
Never store flammable liquids or gasoline-powered equipment inside a home, utility room or garage where vapors could be ignited by a spark or flame.
Source: CPSC, Don’t Get Burned: Flammable Liquid Vapors Are Invisible, Explosive and Unpredictable (Pub. 5140), accessed November 2026.
The U.S. Fire Administration adds two rules for the shelf and the fill-up:
Store products in their original containers out of the reach of children and pets. Store anything that can catch on fire away from your home. Never store materials that can cause a fire in the sun or near an open flame or heat source.
Source: U.S. Fire Administration, Home Hazardous Materials, accessed November 2026.
Only fill portable gasoline containers outdoors in an airy area. Make sure to place the container on the ground when you fill it.
Source: U.S. Fire Administration, Home Hazardous Materials, accessed November 2026.
The two sources differ on a detached garage: NFPA lists it as an option, and the CPSC line above names the garage among the places not to store fuel. Ask your local fire department, and when in doubt, keep fuel out of the garage.
Local fire codes can also limit how much fuel you may keep at home. We did not find a federal home limit, so ask your fire department what applies where you live before you decide how much to store.
What do the agencies say about generator fuel?
If the fuel is for a generator, the CPSC covers storage and refueling in one place:
Never store fuel for your generator in the home. Gasoline, propane, kerosene, and other flammable liquids should be stored outside of living areas in properly-labeled, non-glass safety containers. Do not store them near a fuel-burning appliance, such as a natural gas water heater in a garage.
Source: CPSC, Portable Generators Safety Alert (Pub. 5123), accessed November 2026.
Ready.gov covers where the fuel and the generator go while you use it:
Generators and fuel should always be used outdoors and at least 20 feet away from windows, doors and attached garages.
Let the generator cool before refueling. Fuel spilled on hot engine parts can ignite.
Source: Ready.gov, Power Outages, accessed November 2026.
The CDC states the carbon monoxide rule plainly:
Never use a generator inside your home or garage, even if doors and windows are open.
Install battery-operated or battery back-up CO detectors near every sleeping area in your home.
Source: CDC, Carbon Monoxide (CO) Poisoning Basics, accessed November 2026.
If a carbon monoxide alarm goes off, get everyone outside to fresh air and call 911.
For the electronics side of running a generator, see whether a generator can damage electronics. If propane is your fuel and winter is the worry, see how propane generators work in cold weather.
What gear is worth buying?
Two things, and one of them is optional.
- A gas can made for the job. The CPSC page above says portable gasoline containers sold to consumers are required to have child-resistant closures. Look for a child-resistant gas can that is labeled for gasoline and sealed when closed. See the listing for size and spout details.
- A fuel stabilizer, if you plan to store gas past a year. The Department of Energy text above says additives are not necessary for gasoline stored under typical conditions for less than 12 months. A product such as Sta-Bil fuel stabilizer is for longer storage, and the label governs how much to use.
If you run a kerosene heater, use only the fuel its manual names. Klean-Heat kerosene is one product sold for kerosene heaters; check that your heater’s maker allows it. The manual and your local fire department decide where and how the heater may be used.
What does this guide leave out?
The previous version of this page covered firewood, charcoal, coal, fuel tablets, batteries, butane, natural gas and fuel polishing. We took those sections out because we could not trace their claims to a federal or fire-safety source, and a fuel page is a safety page. For those, follow the manufacturer’s instructions and ask your local fire department.
Frequently asked questions
How long does gasoline last in a gas can?
A study sponsored by the U.S. Department of Energy found that gasoline stored in a sealed container at typical outdoor temperatures stays within US standards for at least a year, per fueleconomy.gov. The source gives no figure for hot garages or ethanol blends.
Can I keep gas cans in my garage?
The CPSC says never to store flammable liquids inside a home, utility room or garage where vapors could be ignited. NFPA advises an outbuilding, a detached garage or an outdoor shed, and never a basement or living space. Because the two differ on detached garages, ask your fire department. When in doubt, don’t: keep the cans out of the garage.
Do I need a fuel stabilizer?
The Department of Energy text says additives are not necessary for gasoline stored under typical conditions for less than 12 months. For longer than that, a stabilizer is a judgment call; follow the product label, or ask your equipment maker.
How long does diesel, kerosene or propane last?
We found no federal number for any of the three, so we are not giving one. Check the label, your equipment manual and the fuel supplier.
How much fuel can I store at home?
Local fire codes decide. We found no federal home limit. Ask your fire department before you decide how much to keep.
Final thoughts
Today, check the fill date on any gas you already have, and make sure the can is a gas can, tightly capped, and out of the house. Ask your fire department whether a detached shed or garage is right for it where you live. Then write what you keep and where on the home inventory checklist so the next person knows. If you are unsure about the fuel, the container or the spot, ask your fire department.
