I live in the Chicago berbs and received a shipment yesterday from Minneapolis which included a bottle of WL 400 Belgian Yeast. Due to bad weather it took 2 extra days for the shipment to arrive. Tthe yeast sat in an unheated truck for 4 days at near zero temperature and when it arrived it was frozen solid. I thawed it out and prepared a starter. After about 20 hours I can't tell whether the yeast is dead or alive. My question is does frrezing kill yeast and would I be better off buying some more yeast and be safe. I hate to wreck a whole brew by pitching dead yeast. I know there is another thread covering starters but didn't want to hijack the thread.