I'm curious about what tricks folks use to prolong the patio building season. 10 years ago we had to quit in the middle of Nov. because of frost. Now, with global warming we still don't have much frost, but it is overdue. I'm starting a 250 square foot patio tomorrow. I know it's crazy but what else am I gonna do sit still? Christmas shop? Anyways, once the base is prepped I'm going to cover it at night with a thick layer of hay. In the past this has worked until the weather gets below 20 overnight. What else is there? And don't suggest renting a circus tent.