As long as it's frozen, meat is good for however long you want. OH and I made a pork roast last month that we bought a year and a half ago. Tasted just fine. If it's frozen, it won't go bad...unless your power goes out for any length of time and it has a chance to thaw a bit, since something that's been thawed can't be refrozen (unless it's cooked, of course).
To thaw meat we usually use the defrost setting on the microwave and then cook it right away, mostly because we don't decide what to do for dinner until we're about to cook so we never think ahead and put it in the fridge the night before to thaw.