In ground is the best option, if not possible then with overhead protection, Keep slightly moist, not wet. Bury them in leaves if possible. Insulate the pot, like the ground does. Put chicken wire around the pot, and fill with leaves.

I would second inground..

Just bury them for the winter in the pots and did up when it's warm again)

Living in the condo presents some 'problems'...do you have balcony?
How many pots?
I would make sure the soil in pots is very well draining; then keep them close together & if possible, surround with dried leaves. Maybe you can make some kind of bed - no bottom, just to keep pots together & keep the leaves around the pots & as mulch on top (from 2x4, or even fencing panels-doesn't have to be really sturdy). You could use chicken wire to make a cage, it will keep leaves from blowing around.
If on balcony, do you get lots of snow in? They still need some moisture as Drew mentioned, so make sure they are not covered up with something like plastic.
Good snow cover should actually insulate them. Worst is if you get constant freeze-thaw.
As long as there isn't water sitting in the pots, they should be ok to overwinter.
Rina

This post was edited by rina_ on Mon, Sep 8, 14 at 9:35

I grow pineberries. They are white strawberries. I also grow regular strawberries too. I covered mine completely with pine straw for the winter. They are in a raised bed. My neighbor didn't do anything. hers' all died, mine are fine. This year I have some in pots. I like using pots. Fungal problems occur a lot while in ground. In the pots they seem to do better. I'm putting my pots in an unheated garage. I still plan to cover them in pine straw. Regular straw is fine too.