How often should you flip a mattress? That depends on the type of mattress you have. Traditionally, mattresses should be flipped twice a year to help them wear evenly and prolong their life. Many of today's pillow-topped mattresses, however, are designed to be one-sided, making flipping unnecessary. Whichever type of mattress you own, it's a good idea to rotate it 180 degrees every few months to promote even wear.