All commercially-purchased flaxseeds have an expiration date on the package, but that doesn't necessarily mean it has to get tossed as soon as that date arrives. How long flaxseeds lasts depends on how they were processed, where you're storing, and which form seeds or ground you've got. If you have whole flaxseeds, they can last months past the expiration, especially if stored in the fridge more on that below.
As for ground flaxseed, it could go bad as soon as a week after the expiration date. The best way to tell if your flaxseed product is rancid is to give it the smell test. When past their prime, those omega-3s inside the seeds release an off-putting sour odor. If it didn't pass the sniff test or there is any sort of bitter flavor, that's the sign to throw your flaxseeds or flaxseed meal out. Keep your flaxseeds fresher longer by keeping them in an airtight container.
Whole or ground, it's not required to be stored in the fridge. Flaxseed is prone to temperature change and removing all of the flax seeds at once may spoil the bag faster. Ground: When grounded, flaxseed will last up to 6 months. Ground flaxseed or flaxseed meal lasts longer in the fridge than being left out, but not as long as whole flaxseed. Whole: Freezing whole flaxseed will extend its total life years after purchase. Ground: Ground flaxseed lasts an additional 3 months when placed in the freezer.
Similar to refrigerating, ground flaxseed does not last as long as whole flaxseed in the freezer. You should only remove the amount you need from the freezer and leave the rest. The temperature change can negatively affect flaxseed composition and may cause the seeds to spoil much faster.
To summarize, whole flaxseed lasts significantly longer than grounded flaxseed. Keeping them in the refrigerator or freezer will keep them freshest for the longest time.
The spoiling happens when the fatty acids break down from light, heat, and oxidation. Spoiled flaxseed may not be dangerous, but it could cause digestive discomfort and more serious complications if consumed regularly over time. Smell: Flaxseed has a natural, nutty smell when fresh. If you detect a sour smell, throw out the seeds. Flax seeds that are fresh and whole, kept refrigerated in a freezer air-tight container lets them last for about a year.
The flax seeds that are grounded when stored in the same condition as the whole flax seeds will last for about six months while at the same time being kept in a freezer.
Flaxseed oil that is commercially cold pressed mustalways be stored in an opaque container inside a refrigerator as researched by semanticscholar. And if they do smell rancid, fishy or musty then, they have gone bad and should not be used for consumption.
Can flaxseed go bad? How long can you store flaxseed? The more processed flaxseed is, the more likely it is to spoil. At room temperature, whole flaxseed can last for six months past the written expiration date on the package, while ground flaxseed only has a shelf life of about a week past the written expiration date. Because the packaging is not airtight, whether or not the package is open has no bearing on the shelf life.
This should cut down on waste, and will decrease the likelihood of eating rancid flaxseed. What makes flaxseed so nutritionally valuable, is also what makes its shelf life so short. Flaxseed contains delicate omega-3 fatty acids that can go rancid rapidly.
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