We keep our pool open year round. My pool was 71 yesterday so my son and I got in. We snorkled down to the main drains with screwdrivers and removed the drain covers. Pool power was off, btw. Both drains where jam packed with leaf debris. I was in for about an hour, swam some laps too (55 laps = 1 mile), so as far as I'm concerned it's pool season here in Dallas Texas.