There is no magic temperature where algae begins to grow. We had kind of always told people that as long as your water was under 50 degrees, it was probably unlikely that algae would start. But, this winter, a couple of us (Poconos and me) both had a very slight streak of algae in our pools and our water temps were in the mid-40s. So, who knows! As long as your ph stays above 7.0 and you just keep an eye on things, you can wait a little longer to actually have to begin testing every day. Maybe just visually check the water and test a couple of times a week for now.