Granulated sugar will keep indefinitely, confectioners' sugar about 2 years, and brown sugar about 18 months.

Will expired powdered sugar hurt you?

Powdered sugar is mainly used as a baking ingredient. It consists of a small amount of anti-caking agent to allow it to flow easily and prevent clumping. ... The sugar has an excellently durable shelf life if well stored. It can last more than three years beyond its expected shelf life and still be safe for use.

How can you tell if your sugar is bad?

If you see lumps in your sugar, that doesn't mean the sugar has gone bad. It just means that it's been exposed to a bit of moisture. All you have to do to use that sugar is break up the lumps, and take out a scoop, and never worry about sugar spoiling again.