Does Corn Masa Expire?

In this brief guide, we will answer the query, “Does Corn Masa Expire?” and will discuss some signs to detect spoiled Corn Masa.

Does Corn Masa Expire?

Yes, corn masa can expire. Fresh masa de maiz, also known as masa preparada, may be kept in the refrigerator for up to three days. In a cold, dark location such as a pantry, masa harina, also known as maize flour or as Maseca, lasts between 9 and 12 months. They should be thrown away if they’ve passed their expiration dates.

What exactly is corn masa?

Not to be confused with the Maseca brand of maize flour bags usually referred to as masa harina or cornflour. Masa preparada, or ready-made dough produced from corn masa and either lard or water, is the other name for this kind of prepared dough created from corn masa. However, it may also be prepared using hominy, which is a dried maize kernel steeped in lime syrup (the mineral, not the fruit).

Regardless of how it’s made, corn masa is used to create corn tortillas, tamales, and a slew of other Mexican sweets. If you’re fortunate enough to get fresh corn masa, you may find it in both coarse and smooth ground forms. For tortillas, you want smooth ground, while for tamales, you want coarse ground.

For how long does masa remain usable?

Refrigerated fresh corn masa keeps for three days. After three days, trash it after keeping it well-covered. Make your masa de maiz at room temperature if you plan on using it to make tortillas. When the weather is warm, the tortillas are less likely to split and break.

Keeping your masa for tortillas at room temperature has the drawback of necessitating its disposal after 12 hours. Keep the masa covered in a Tupperware container or wrapped in saran wrap, whichever you prefer.

Maseca flour shelf life

Maseca is a well-known brand of masa harina, the primary ingredient in corn masa. Maseca flour is available at the grocery store in the same plastic bags as other flours, and it may be stored in the pantry with other flours. A plus is that Maseca is more durable than wheat or other kinds of flour.

Corn flour or masa harina, regardless of brand, should last at least nine months and, in most instances, up to twelve months. Maseca, for example. Just be sure to keep your flour in a cold, dark location, like the pantry, to prevent mold growth. Use a container with a cover to keep it fresh longer and keep pests away. White flour and maize flour should not be stored in the refrigerator because they may get too wet and develop mold. Whole wheat flour can be stored in the refrigerator.

The “best before” date is usually printed on the bag of flour. While an expiry date indicates that the product has gone bad after that date, this signifies just that it tastes better while it’s still fresh. However, you should attempt to utilize your Maseca within a year after opening it.

If the cornflour is bad or ruined, how can you tell?

The main problem with maize flour/masa harina isn’t typically the age of the product; rather, it’s bugged. Weevils, to be exact. 1 will often lay eggs in a sack of flour or grain. After then, those pesky aphids spread throughout your pantry, eating everything in their path.

If that occurs, you may put the bag in the freezer to put an end to the infestation, but you should simply throw it away. Once you’ve done that, do a thorough purge of your pantry. Toss anything that seems infected from an open bag or package. Make sure no eggs are hidden on the shelf by using a spray cleaner and cleaning the shelves carefully.

To determine whether corn tortillas are rotten, look for any of the following signs:

  • If stored properly, corn tortillas will last in a pantry for 7-10 days and the refrigerator for 6-8 weeks before going bad. For a shelf life of 6-8 months, place them in the freezer.
  • Mold stains are the most obvious indication of a poor tortilla.

Not the same as brown or black markings on certain tortillas left by the griddle. As a result, pay close attention. If you detect even a speck of mold, throw away the whole box since mold spores will have spread throughout the tortillas even if they aren’t yet visible.

Corn tortillas, how long do they keep their freshness?

Corn tortillas, in contrast to their wheat counterparts, don’t keep for extended periods.

Having said that, this does not imply that they go bad. However, they soon develop a robust exterior and leathery hide. The reason for this is because I don’t purchase corn tortillas from the grocery store unless they make them fresh every day in that particular shop.

Make them yourself if you can’t find a nice local restaurant where you can purchase fresh ones. Rick Bayless is my favorite Mexican chef, even though he is not Mexican. See how he makes fresh corn tortillas the easy way. 


In this brief guide, we answered the query, “Does Corn Masa Expire?” and discussed some signs to detect spoiled Corn Masa.


Hi, I am Charlotte, I love cooking and in my previous life, I was a chef. I bring some of my experience to the recipes on this hub and answer your food questions.