Unless it finds a really warm spot it will not survive your winter.
It will be in a tight place that gives the proper heat it needs. Depending on the temp you have in the barn I would look and search the spots that you think would be the closest to what it needs (85-95). This could be anywhere.
Something you could try:
Get flour, make a large circle that is pretty thick. Then make another one or two circles within that one. In the center place a clear critter carrier (example: http://m.petsmart.com/mt/www.petsmar...ductId=2753371 ) with one or two live mice inside, I would use two considering the size of the area. Then hope and prey it is still within the barn and tries to get the mice. I would check it often and if you don't find it trying to get the mice maybe you will atleast get a flour trail to give you a narrowed search.
I would also set up a heat source near the mice so when it gives up trying to get them maybe it will crawl inside. Maybe a small box with a heat lamp over it or maybe even its hide. I would put it on a towel so the cold floor doesn't keep it from staying. Be sure to make sure the lamp creates the proper hotspot otherwise it won't stay.
This could really be a long shot but it is the best chance I know to find it.
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