As long as it doesn't get down to 50 and stay there, Blue Tilapia will do just fine. The deeper the water the better. Also they hardly eat at all at that temp. Last year I had my inground swimming pool loaded with them here in NE Fl. and the night temps got down into the 20s more than once (but the day temps were up in the 50s & 60s) and never lost the first one; of course the deep end of the pool dept was about 9'.