I've done this too. What I did, however, was to store it in a vacuum sealed bag. I've had bud stored in there for over a year and it is pretty much just as good as the day I bought it. Vaccum sealers are pricey though and if you don't already have one I wouldn't go and spend the money just for weed.

Another option that is better than a ziplock is to get one of those jars that have a rubber gasket and a clamp that you lock down. That's mine in the picture. They're pretty much airtight and work really well. You can pick one up for a couple of bucks.