You Should Never Store a Propane Tank Here (Especially in Winter)

Propane tanks are resistant to frigid temperatures; after all, they are designed for outdoor use. They can withstand cold temperatures as low as -44 degrees Fahrenheit (F). However, properly storing your propane tank in the winter is key to safeguarding the unit (much like storing a boat or motorcycle in the winter). We’ll get into the details ahead, but first, spoiler: You should never store your propane tank inside your home or attached garage. 

If you own a small propane tank, this article will cover everything you need to know about storing it safely. 

How Does Temperature Affect a Propane Tank?

Propane tanks are made to endure a wide range of temperatures, including cold weather. Propane tanks are built and designed to be corrosion and rust-resistant to help preserve the integrity of the propane, keeping it free of contamination. Robert Onderko, senior manager, Safety ACE, S&L Divisions at AmeriGas Propane, explains, “[A propane tank’s] thick metal construction can withstand harsh weather conditions. One of the physical properties of propane is that it contracts in cold temperatures and expands in warm temperatures.” 

When it is too cold, below -44°F, the unit's efficiency drops. On the other hand, when it is too hot, over 120°F, the propane tank can increase its pressure and potentially create a rupture. Onderko emphasizes, “Propane volume and pressure increases with rising temperatures. It is important to ensure that tanks are filled to the proper level to account for this expansion. Tanks and cylinders should always be stored in a shaded area out of direct sunlight to maintain safe operating temperatures below 120 degrees Fahrenheit.” 

Related: How to Winterize a Sprinkler System So Your Pipes Don't Burst

How Cold Is Too Cold for Propane Tanks?

Propane tanks are designed to withstand severe cold weather without affecting the propane’s functionality and can be used in a wide range of weather conditions. That said, because propane has a boiling point of -44 degrees Fahrenheit, anything below -44°F would be too cold. 

“In very cold weather, propane will not freeze, but the propane inside the tank will decrease in volume and pressure,” Onderko notes. 

Unless you live in a remote area of Alaska, where temperatures drop below -44°F, you likely don’t have to worry about extreme temperatures affecting the integrity or efficiency of your propane tank. 

How to Safely Store a Propane Tank for the Winter

If you don’t plan on using your propane tank over the winter, you’re in luck. Storing it is easy. You can even keep it outside, if you want. 

Step 1: Close the gas valve completely. You want to ensure it is securely fastened to prevent accidental gas release. 

Step 2: Disconnect the propane tank from your grill, space heater, or fire pit. It is not recommended to store propane gas inside any ignition devices. 

Step 3: Before saying goodbye to your tank for the season, conduct a visual inspection to assess the tank's integrity and check the valve for potential leaks. Apply soapy water to the valve. If bubbles form, there’s a leak and it should be fixed immediately.

Step 4: Identify a well-ventilated area away from your home, vehicles, and any pathways where you can store your propane tank. An outdoor space is best. 

Step 5: Place the propane tank upright on a flat, solid surface, such as a stone or wood block. If necessary, secure it with a strap. 

Step 6: Optional: If you store your propane outdoors, you can install a tank cover, though it is not required. 

Things to Avoid When Storing a Propane Tank for the Winter

A propane tank can pose a hazard if not stored correctly. These are the things you should never do with your propane tank. 

• Don’t store it inside your home, in a living space, or in an attached garage. 
• Don’t leave the gas valve ON. 
• Don’t place your tank on its side or upside down.
• Don’t expose it to temperatures above 120°F or below -44°F. 
• Don’t store your propane tank near heat or power sources or appliances. 

Related: Plumbers Explain How to Winterize Your Hot Tub to Prevent Freeze Damage

Can I Store My Propane Tank Indoors?

You should never store your propane tank inside your home or in a garage attached to your home. Onderko notes, “These spaces lack proper ventilation, and in the event of a leak, propane accumulation can create a fire or explosion hazard if exposed to a spark, static electricity, or heat source.”

Can I Store My Propane Tank Inside a Shed?

It is safe to store a propane tank in a well-ventilated shed or detached garage. The tank should always be placed in an upright position with the valve closed and away from any flammable materials or other devices that could cause a fire.