Ever see frogs in winter? When it's cold, they sleep. BULLFROG SNOT can be frozen in shipment. Once frozen, it's gone. There is no recovery, the magical DNA just quits. We pack domestic  orders in multiple layers of bubble wrap surrounded by several inches of insulating fluffy froggie droppings, and a warning label on the box. It survives the trip well, unless it is left outside for long periods in sub-freezing conditions. International deliveries don't get as much protection, there is just no room in the box. So, if there is the possibility of freezing, you'd best get your BULLFROG SNOT from your favorite LHS. Keep it snuggled in your pocket. Once applied and properly cured, you'll have no problems. In fact, it will solve your problems and have you running long trains uphill.