We ship most orders, including international, via USPS Priority Mail. Most orders received by 5 pm EST USA are shipping the same day. We always provide you with a tracking number and contact information in case there is an issue with your shipment. Upon request, we can overnight or express your package, however, you're responsible to pay the additional shipping cost. We use insulated, discrete packing for all shipments...in cold climates, we will automatically ship them on thermal packings at no additional cost to the buyer. Most liquid cultures (not Pink Oyster) do fine in the cold but cannot be allowed to freeze.