Each bar has a "best by" date written on it, and it varies from 10-24 weeks from the date of purchase without refrigeration.  Check out the "details" of the product in our online store and you will find the best by date.  Because we don't use preservatives, we are limited by the shelf-life of the natural individual ingredients we are using.  You can probably stretch it out if you keep them in the fridge, but that's entirely up to you.  We personally recommend you stick to the date on the bar.