The biggest threat to your fireworks is moisture. The gunpowder inside the fireworks only remains stable if there's no moisture inside the cartridge. As soon as the powder is in contact with water, for instance, the powder becomes unstable.

How long will fireworks stay good?

Do not place fireworks in areas that can become extremely hot, like a garage, or a basement. Co-owner of Hoffman Family Fireworks says fireworks can last for years as long as they are stored carefully. ”Shelf life is quite a long time for fireworks, it can be stored for several years as long as their kept dry.

Are 10 year old fireworks safe?

How old are they: Generally, fireworks can last several years. In some cases, they can remain safe and effective for up to eight years. However, this varies significantly from one type of product to the next. Ultimately, use fireworks as soon as possible and avoid storing them.