How to Tell If Your Grains Have Gone Bad: Top Signs to Look For

By: Bob's Red Mill | May 24 2021

Do you have a pantry stocked full of good-for-you grains? If so, then you're likely wondering how long each will last. While most grains last longer than the perishables you keep in your fridge, they do have an expiration date. Knowing how long grains will remain fresh and how to store them is an essential part of practicing proper food hygiene. Continue reading to learn more about the average shelf-life of grains and discover ways to keep them fresher for longer.

How Long Do Grains Last?

The shelf life of a grain largely depends on the type you purchase and how you store it. Most grains will remain fresh for 6 months, with some having a shelf life of over a year when kept properly. While different grains have different requirements for storage, most grains are best kept in a cool, dry and dark place. Storing them in an area like the pantry will help prevent the grains from overheating or soaking up the moisture around them.

The most common way to tell if they have gone bad is by using your senses. If you notice that your once fresh grains have changed in color, texture or odor, don't eat them. This usually means that your grains have spoiled and are no longer safe to ingest.

If you've prepared grains and wonder how long they will last, the shelf life of already-cooked grains is much shorter than dried grains. Depending on the ingredients you mix with your grains and how you store them, we recommend enjoying prepared grains within 1-3 days. Frozen grains will last significantly longer.

The Shelf Life of Different Types of Grains

As we mentioned earlier, the type of grain significantly affects its shelf life. To better understand how long each grain lasts and how to tell if they've gone bad, the Bobs' Red Mill experts have put together this guide of popular grains and their average shelf life.

Oats

Oats are a grain that many people enjoy daily. When storing packages and dry mix oatmeal, you want to make sure that it is stored in a cool and dry environment with a consistent temperature. Temperature changes and moisture can significantly affect oatmeal's taste, flavor and texture and cause it to spoil quickly. Even if your oatmeal is kept in a package, temperature changes can produce condensation, causing the contents inside to rot or mold.

Once you've prepared oatmeal, you'll want to ensure that it is properly stored in the refrigerator or freezer immediately after being cooked. After preparing your oatmeal, spoon the leftovers into an airtight container that will help keep moisture and bacteria out. Store it at a temperature below 40°F.

However, even if your oats still look fresh, it's important to remember that, like many other seeds, oats usually have a best by date and should be enjoyed before then. If your dried oats begin to change color, retain moisture, or develop a strange scent, it's time to change them out for some fresh ones. For prepared oatmeal, the first sign of spoilage is a change in the texture where the liquid has separated from the other ingredients. If this happens, your oatmeal could be developing mold, and it is unsafe to consume.

Quinoa

Quinoa has a long shelf life if it's kept dry, and it's usually hard to tell if it's spoiled. Dried quinoa does not usually smell rancid or change texture if it's spoiled. Because of this, you'll want to check the bag of quinoa for the best by date and make sure you label the container you're storing it in. Cooked quinoa, however, does show a change in texture as it begins to spoil and will usually harden and grow mold.

To store quinoa to extend its shelf life, make sure to place it in an airtight container in a dark and cool place. Like oatmeal, cooked quinoa should be kept in a refrigerator or freezer and should not be allowed to sit at room temperature for longer than 2 hours. Additionally, to extend the shelf life of cooked or dried quinoa, you can place it in the freezer in a freezer-safe container.

Flour

Bowl of wheat flour and sackcloth bag with scoop on light background

Your pantry may be stocked with several different kinds of flour, and each will have an expiration date stamped on the bag. It's essential to make a note of this expiration date and watch your flour closely for changes. Moisture, bugs and high temperatures can cause the flour to spoil quicker than the expiration date. If you notice that your flour has changed in color, texture or smell, You will want to throw it out, no matter when it was purchased. The best indicator of spoiled flour is a batch that smells stale, musty or sour. 

We hope that this guide has helped you better determine how to tell if your grains have gone bad, as well as provided you with tips on how to keep them fresh for longer. From airtight containers to freezing your grains, there are several ways to care for them properly. From the Bob's Red Mill family to yours, happy baking! 

58 Comments

  1. Joel A Munks
    I was given a bag of golden flax seed meal unopened. expired date 4/26/2019. is it still good?
    Reply
    1. Whitney Barnes
      Whitney Barnes
      Hi Joel - we'd recommend getting a fresh bag at this point.
      Reply
  2. Lorine
    You talked about regular flour, but how long past the expiration date would gluten free flour last assuming that it is kept in a cool dark moisture free storage.
    Reply
    1. Whitney Barnes
      Hi Lorine - We recommend enjoying our products within their best by date or about 6 months beyond. Storing in a cool, dark place in an airtight container will help maximize the freshness.
      Reply
  3. Jan
    I have two 32 oz Red Mill Organic Extra Thick Rolled Oats Whole Grain and cannot find an expiration date anywhere...are you able to tell me when they expire? The only stamped code I can find is: SUP106050-01 v2a
    Reply
    1. Whitney Barnes
      Hi Jan! Our oats have a 24 months shelf life. There should be a unique best by date on the bottom of the package. If you're unable to find it, our Customer Service team can help identify the best by date by using the 6 digit lot code. They can be reached at 1-800-349-2173 or [email protected]
      Reply
  4. Sue
    I have an unopened package of 7 Grain Hot Cereal with a best by date of August 26, 2021. Can I still use it? Thanks!
    Reply
    1. Whitney Barnes
      Hi Sue - we recommend enjoying our products within the best by date or about 6 months beyond if it's been stored in a cool, dry place. The product should still smell like fresh grain with no sour or off-odors.
      Reply
  5. Cynthia Olsieski
    Cynthia Olsieski
    Have a bag of medium coarse corn mill. Dated 2/21 is it still good. I just got it out if pantry it was never opened
    Reply
    1. Whitney Barnes
      Hi Cynthia, we recommend enjoying our products within the best by date or about 6 months beyond.
      Reply
  6. Trevor C Branch
    How long can the vital wheat gluten flour last if I can it with oxygen absorbers, or freeze it?
    Reply
    1. Whitney Barnes
      Hi Trevor - our Vital Wheat Gluten has a shelf life of 18 months. We unfortunately haven't tested freshness and performance beyond that.
      Reply
  7. Mark Fischer
    Does Bob's package their flour using inert gas like nitrogen or co2? I heard this can extend the shelf life.
    Reply
    1. Whitney Barnes
      Hi Mark - No. Nothing additional is added to our items to prolong their shelf life.
      Reply
  8. Cheryl
    As part of a Halloween gift from a national grocery chain, I was given two packets of your instant oatmeal packaged with a coupon. When I opened the package, I saw that the instant oatmeal packets had old dates on them. One had a date of 07062021 and the other 06072021. I assume these are the expiration dates. The coupon doesn't expire until 1/31/22. Should I discard the oatmeal based on these dates; and why would Bob's Red Mill old expired oatmeal be packaged with a recent coupon? The grocery store did not package these together; it was already sealed when they received them.
    Reply
    1. Whitney Barnes
      Hi Cheryl! Please contact us about this at [email protected]
      Reply
  9. Dan Horne
    We just found an unopened bag of Gluten-Free Quick Cooking Oats, with a "sell by" date of 2/12/2016. It was kept in a dark pantry, pretty constant temperature, low humidity. Would this be OK to use?
    Reply
    1. Whitney Barnes
      Hi Dan - We recommend eating our products within their best by date or about 6 months beyond. At this point, we'd recommend a fresh bag.
      Reply
  10. Rachael
    I have an unopened bag of organic stone ground dark rye flour stored in a dry kitchen cupboard since purchase. The "Best By" date is 1/02/2022. Would this fall into the using "within the best by date or about 6 months beyond" category? Thank you!
    Reply
  11. Bill
    I got 20 or so #10 vacuumed packed cans of red winter wheat. How long are they good for?
    Reply
    1. Elisabeth Allie
      Elisabeth Allie
      Hi Bill! The best by date will be printed on the packaging.
      Reply
  12. Vicki
    I have bulgar with an Exp. of 11/21. Is it still good, It's unopened?
    Reply
    1. Elisabeth Allie
      Elisabeth Allie
      Hi Vicki! We only recommend using our products until the best-by date stamped on the package. This is the range of time in which the product has been determined to be of the best quality. We have had our products tested by a 3rd party laboratory and the best by date is what they have determined for each product. We have not had our products evaluated at various times past the best by date, so this is the only date we can recommend.
      Reply
  13. Lilly
    I have an opened package of Bobs whole grain sorghum. The best before is 2022 AL 09. There is also another date which I believe would be produced date which is 09 04 2020. Is it still safe to eat or should I throw it out?
    Reply
    1. Elisabeth Allie
      Elisabeth Allie
      Hi Lilly! We only recommend using our products until the best-by date stamped on the package. This is the range of time in which the product has been determined to be of the best quality. We have had our products tested by a 3rd party laboratory and the best by date is what they have determined for each product. We have not had our products evaluated at various times past the best by date, so this is the only date we can recommend.
      Reply
  14. Katherine
    If I store your grains and beans in the freezer, does that extend the shelf life? If so, how do I know how long they are good for?
    Reply
    1. Elisabeth Allie
      Elisabeth Allie
      Hi Katherine! We only recommend using our products until the best-by date stamped on the package.
      Reply
  15. candace muhlrad
    candace muhlrad
    i have Trader Joe’s 10 min farro
    expiration6/16 22
    can i use it
    Reply
    1. Elisabeth Allie
      Elisabeth Allie
      Hi Candace! We only recommend using our products until the best-by date stamped on the package.
      Reply
  16. Lita
    I purchased 3 packages of Bob’s Red Mill Semolina Flour. The best by date is May 13, 2023. How long past the expiration date is it safe to use, if stored in a Mylar bag with oxygen absorbers and kept in a cool place (in an airtight bucket with a gamma lid)?
    Reply
    1. Elisabeth Allie
      Elisabeth Allie
      Hi Lita! We only recommend using our products until the best-by date stamped on the package.
      Reply
  17. Kathy
    I got given a 453g bag of Bob's Red Mill 5 grain rolled hot cereal with a solid air pocket at top,expired april of 2021,are they safe to eat? Haven't bought any for awhile.
    Reply
    1. Elisabeth Allie
      Hi Kathy, we cannot recommend consuming any of our products past the best-by date printed on the package.
      Reply
  18. Toby
    I have an unopened bag of Bobs RM gluten-free steel cut oats . Kept in a cool dry place since purchased. BBD is 6/27/2022. From what I’ve read it should still be ok to consume.
    I usually store my oats in the back of my refrigerator in a ziplock bag.. So can I assume that it will still be good until at least December 2022…..
    thank you for your reply.
    Reply
    1. Elisabeth Allie
      Hi Toby, we are unable to recommend consuming any of our products past the best-by date on the package.
      Reply
  19. jenny
    I just opened fresh bought Bob's red mill all purpose flour, I smell something like old rice flour. Expiry is 2024.
    I've been using same flour for long time but this is my first time noticed.
    Is it safe to use? my bread taste different, and smell is not nice as usual.
    Reply
    1. Elisabeth Allie
      Hi there! Please email [email protected] and they'll be happy to help!
      Reply
      1. jenny
        Thanks Elisabeth. I sent a message to customer service just now.
        Reply
  20. Judith Clark
    I have a packet of Faro sell by )6/25/2016. Is it sake to use
    Reply
    1. Elisabeth Allie
      We do not recommend eating our products past the best by date.
      Reply
  21. Joy
    I have a bag of unopened gluten-free cornbread mix - but there seems to be air inside the bag. (It's a little puffy). Is it safe to use?
    Reply
    1. Elisabeth Allie
      Elisabeth Allie
      Hi Joy! You'll want to check the best-by date on the packaging.
      Reply
      1. Gretchen
        Same question, less than a month past expiration date but bag is puffy? Safe to eat? It's in oven now
        Reply
        1. Elisabeth Allie
          Hi Gretchen! We do not recommend eating our products past the Best By date.
          Reply
  22. William HAND
    I can't find this information anywhere else so I thought I would ask here. Is anything done to kill and/or prevent harmful bacteria in products like hot cereal? Is it heated before packaging?
    Reply
    1. Elisabeth Allie
      Elisabeth Allie
      Hi William! Please email [email protected] for assistance.
      Reply
  23. Jim Bailey
    I am really enjoying the organic extra thick rolled oats but am concerned that I don’t find an expiration date anywhere on the 2 pound package. Please send me explanation or where it is located.
    Reply
    1. Elisabeth Allie
      Elisabeth Allie
      Hi Jim! Please email [email protected].
      Reply
  24. Tony
    Hi. I bought a whole wheat flour from redmill and found bugs in it after opening the bag for the first time. Is this possible?
    Reply
    1. Elisabeth Allie
      Elisabeth Allie
      Hi Tony, I'm so sorry you experienced that! Please email [email protected] so we can help.
      Reply
  25. Estrella
    I have organic whole grain buckwheat 16oz bag best by 7 Nov 2020. Is it safe to eat?
    Reply
    1. Elisabeth Allie
      Elisabeth Allie
      Hi Estrella! We do not recommend eating our products past the Best By date on the packaging.
      Reply
  26. Jeanie Griggs
    I have a bag of unopened bulgar wheat that expired June 19, 2022. Is it still good or do I need to toss it?
    Reply
    1. Elisabeth Allie
      Elisabeth Allie
      Hi Jeanie! We cannot recommend consuming our products past the Best By date.
      Reply
  27. Heather
    Rancid or bad bag of 24 oz organic, steel cut oats:
    Had a bag of these unexpired oats stored in my basement fridge for several weeks or perhaps a few months, unopened, They expire in October 2024. I stock up on this product when it's on sale but don't know where I bought them. Might have a receipt somewhere if it's important. Lot number 23-116-waq-32, under that it says 14:12:27 04 2023. Wasn't smelling them for freshness initially. Just opened and cooked them. My oatmeal tasted a bit off, which I assumed was perhaps due to a bad piece of dried fruit or nuts that added to my bowl . However a half hour or so later both I and my dog (I make her food, using a little of whatever grain I am cooking for breakfast) both got sick after eating these.
    When I smelled them, they didn't smell fresh, not alarmingly rancid though, just a bit off. Definitely smelled old.
    Disappointed.
    Reply
    1. Elisabeth Allie
      Hi Heather! I'm so sorry to hear that. Please email [email protected] for assistance.
      Reply
  28. Joseph Gambino
    Bought 5 bags of 24 oz Gluten Free Steel Cut Oats. Does Freezing the unopened individual bags, which I will double wrap each bag individually with Saran Wrap and Heavy-Duty Aluminum Foil introduce moisture? Or should they be kept in the pantry which is dark and dry? Which method will extend shelf life? Btw, the best oatmeal in the world. Keep up the good work.
    JoeG
    Reply
    1. Elisabeth Allie
      Elisabeth Allie
      Hi Joseph! These keep best refrigerated or frozen, especially if they've been opened. If they are unopened, you don't need to worry about moisture.
      Reply

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