Should flour be thrown out past its expiry date?
The main things that can go bad with flour, assuming it is properly stored are:


Rancidity
Insect infestation


If you don't see any insects, and it still smells good, you should feel free to use it.  If it smells off or nasty&mdash;trust me, your nose will tell you&mdash;then you will want to discard it.

The actual date on the bag is only a guideline.