We uncover the pool in April. It’s still way too cold to swim. But the cover is removed because the pool looks so much better and the grass border needs time to grow again. When you’re young you’re bullet proof. And, apparently that includes being impervious to the cold. No matter the temperature of the air or water, my kids would always find some way to fall into the pool within hours after arriving at the house. I mean it’s cold enough to take your breath away and there they go jumping in!