If you plan on using it within it's expiry date, you can get away with storing it at room temperature. Obviously, don't leave it in direct sunlight. If you want to keep it after the expiry date, and you are concerned with the accuracy of the colours produced, then you should keep it in the fridge, which is generally understood to approximately double it's lifespan on the assumption you bought it fresh. Personally, I think about in the sense that the length of time between when it goes in the fridge and the expiry, is the amount of time after the expiry date that will provide essentially unchanged results.
Freezing I understand to approximately double this total time again. So in other words, if you had 2 years between now and the printed expiry date, refridgerating it will give you 4 years, and freezing will give you 8. This is all very ballpark, and in reality, most that freeze their films use them well beyond 10 years after the expiry and the results are fine.