We have written a blog all about the freezer method of storage, but basically you have to try it to taste how good it works. Fresh coffee beans or grounds never freeze, the consistency of the cold and dark environment locks in freshness, where as the light and heat changes of a kitchen will quickly start to deteriorate the colour and taste of fresh ground coffee. Of course as with anything in the freezer, if water gets into a product, it freezes, expands and ruins it, so whilst fresh coffee doesn't freeze, water would and then that's what would ruin it. But, put coffee in an air tight freezer safe jar so no water can get in and it is magic, coffee will be preserved way past it's best before date, to use straight away as needed.
We tested over 2 weeks with the same coffee batch.. Some in the freezer and some left in the kitchen. Within a week or so the kitchen coffee lost colour and significant taste, whilst the freezer coffee grounds were as fresh as the day they went in. This speaks volumes to us!