Liquid Yeast Freshness Policy: Wyeast and Omega Labs print a packaging date on all packs and recommends that they be used within 6 months as a direct pitch. After 6 months creating a starter is recommended. Although we treat our yeast with extreme care and keep it refrigerated in a commercial fridge at 35F the whole time we have it, we take a more conservative approach as a courtesy to our customers. Any liquid yeast pack that turns 4 months old gets thrown away and removed from inventory. As you can imagine, keeping up with aging packs is pretty tedious so there may be times when you order a pack and we find it to be over the 4 month date. If that happens, we will contact you. In other words, you'll never get an old pack from us out of the blue.