This answer varies depending on who you ask. The most conservative is about 60 days in the fridge. You could do a few months in the freezer. Another great tip is to only buy flax meal from a store that keeps it refrigerated...you never know how long it's been sitting on the shelf. If you have the option, you can buy whole flax and grind it as needed. Whole flax stays fresh in the fridge for up to a year if stored properly.