i'm ganna say the 9th or 10th for opening day, they have been blowing like crazy when ever possible and even pushing it at times i believe, but like others have said it's supossed to warm up, now we can all hope it doesn't but if it does i'd say a good inch or two will melt if not more(it looks rather deep so i'm hoping that it holds alot) if they keep the guns on, turn them off when they absolutly need to and then get them back on as soon as the temps go below frezzing they should be okay but i think the 3rd is pushing it a little, but maybe not