The shelf life of cake mix is roughly 4-5 months beyond the 'best before' date stamped. However, this entirely depends on the type of cake mix. A dry cake mix will last longer, whereas a wet mix may not go beyond a month. Further, depending on how you store the cake mix, it can last longer.

What happens if you eat expired cake mix?

There is nothing harmful about using an outdated cake mix, but it may not taste as good as you want it to, or may not raise the way you would like it to. ... Cake mix manufacturers don't recommend adding baking powder to salvage an old mix.

Can I use a cake mix that is 2 years old?

Although the company states that there aren't any safety risks if you do use cake mix past its use-by date, there could be changes in the taste and texture. Using cake mix past its recommended date may cause the cake to be less fluffy or even coarse in texture.