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How to store a propane tank outside
Don't leave your tank inside or in a shed.
If gas were to leak, it would contaminate the area and make it dangerous. Even the spark of starting a vehicle or lawn mower could ignite a propane leak.
If you live in a snowy area, mark the location of your tank in case it gets buried so you can easily find it and clear away snow. Store the tank in a dry, well-ventilated outdoor area.