Yes, you can freeze sugar. White sugar doesn’t become clumpy and does not spoil as fast as brown sugar, but it’s still an excellent choice to freeze your sugar.
Although, the optimal way to store sugar is in a dark, dry, and cool area. This means you don’t have to take up space in the freezer with your sugar. For most people, this is their pantry or basement.
Keeping it in room temperature will make the sugar last just around the same amount of time as freezing it, so freezing it or not is up to you.
But, if you choose to freeze your sugar, you may decrease the chance of it becoming lumpy with excess moisture or melting in the summer if you’re in a warmer location.