How do you keep MMF from drying out? anytime I make a batch it becomes hard in a short time although I seal it and put it in a plastic container.Can you freeze it?

Charmed, I have never frozen mine as i dont find I need to.
I use a little spray oil on my hands and knead it into the fondant to soften it up or place it in the microwave for a few seconds - both these work for me every time

I actually just did my first thawing of frozen fondant. I coated the stuff with shortening, wrapped it very tightly in plastic wrap and two bags, and froze it for several weeks (maybe two months?). When I thawed it this week, I just put it in the fridge about three days ahead of time (not sure how much time you would actually need, since I did it way ahead and never checked it until I needed it). The consistency was absolutely perfect.
Severa CCers responded to my thawing post, when I asked how they thawed their fondant, and some of them did their thawing countertop. You can look up my post for their great suggestions, if you like ... "Defrosting fondant" from earlier this week. Good luck!

Thank you both for your replies. I wanted to make everything ahead of time so that the day I need fondant just thaw it.