How Long Does It Take For White Bread To Mold? Learn From The Best Guide!

Helen Skeates
Helen Skeates
15 min read

White bread is a ubiquitous basic item, and many people wonder how long it takes for it to mold. In as little as three days, mold can grow on white bread, so it’s best to store it in a cool, dry place.

There are a variety of elements that influence the growth of mold. Ingredients and storage conditions are two examples of these.

Continue reading to find out how long bread can be stored and how to make the most of its shelf life.

How Long Does It Take Before Bread Gets Moldy?

For the most part, bread molds in three to seven days. Ingredients, type, and storage method all affect the shelf life of a loaf of bread.

Is It Safe to Eat Moldy Bread?

Organic white bread is the most susceptible to mold of any bread kind. When compared to store-bought loaves, organic white bread has fewer preservatives, making mold growth more rapid.

Because of this, you should expect white bread at room temperature and exposed to moisture to mold within three days. White bread can be kept fresher for longer if it is stored properly.

Why Does Mold Grow On Bread?

Mold may be found just about anywhere. In order to propagate, mold releases spores into the atmosphere. Mold begins feeding and spreading as soon as it lands on moist organic material.

When mold produces velvety patches, you can tell it’s growing. These patches come in a variety of hues, including blue, green, and black.

Moisture, acidity, and preservatives all have a role in how quickly mold grows on bread. Its spread and development are also influenced by the weather.

Many types of bread are non-acidic and have a pH level of seven or less. Sourdough bread has a greater acidity level than white bread.

As a result, mold grows on sourdough bread much more slowly than on white bread. When it comes to bread mold, climate and moisture play a huge role.

A wet and humid environment is ideal for the growth of mold. Mold will grow more quickly if bread is exposed to both air and moisture.

Even in the refrigerator, mold can spread via spores in the air. The fungus has the potential to spread to other foods as well as to machinery.

Here are the five measures you should do to remove mold from your freezer.

Is It Bad To Eat Moldy Bread?

Mold does not necessarily pose a threat. A small quantity of mold probably wouldn’t be harmful to you at all if you ate it.

Mold, on the other hand, can inflict more severe effects in some people. When breathed, fungus spores can cause respiratory problems.

As a result, you may experience a runny nose, sneezing, and itchy eyes. People with asthma and other autoimmune conditions are more likely to suffer from the side effects, which are more severe.

Mold can make you sick if you consume large amounts of it, and the effects can worsen depending on the type of mold you consume. Some varieties of mold are known to cause nausea and vomiting, while others can release poisons into the environment.

Black mold, for example, is notorious for its toxic mycotoxins. Wheat and nut products are the most commonly affected by these poisons.

Mycotoxins can induce persistent exhaustion, rashes, depression, and cancer when ingested or inhaled.

Mold can be deadly if left unchecked. If you’d want to learn more about the most deadly mold, check out this useful article.

It’s preferable to toss the entire loaf if you notice mold on a slice. Only when there is a lot of mold does it become evident.

They may often go for long periods of time without being seen, which allows them to establish extensive root systems.

What Happens If You Accidentally Eat Mold?

Which Breads Mold Faster?

White and multigrain bread are the two most popular varieties of bread in the United States. It doesn’t matter if a family bakes its own bread or buys organic bread; all households are aware that improperly stored bread will mold.

Because organic white bread includes less preservatives, it tends to mold more quickly than non-organic white bread. Because it’s more difficult to control the acidity levels of homemade bread and may have fewer preservatives, homemade bread molds more quickly than store-bought bread. Bread with raisins and bananas is more susceptible to mold since it is wet.

Mold grows in moist and dark environments. Moisture, warmth, and nourishment are all necessary for its growth. There are velvety green patches of mold that begin to grow as soon as mold spores touch down on bread. How quickly a loaf or slice of bread molds is determined by its acidity, moisture, environment, and preservatives.

Acidity of Bread

Bread’s acidity or pH level can influence how quickly it will mold. An acidic or basic environment has a pH value below 7, whereas a pH value over 7 is considered neutral. Most forms of bread have a pH level between 6 to 7.5, which is just shy of neutral. Breads and other baked items that are more acidic are less susceptible to mold. Breads like sourdough, which are strong in acidity, are less likely to mold than white or multigrain breads because of their acidity.

Moisture Level of Bread

Bread molds more quickly if it has a high moisture content. Mold flourishes in moist conditions, which is why wet bread molds faster than dry bread. You may test this by taking a piece of dry bread and soaking it in water, and then comparing it to a piece of wet bread.

Climate of Bread

Bread molds more quickly if it is kept in a warm, moist environment. Mold thrives in dark, moist conditions. In order to determine which sort of bread molds the fastest, you would put one slice in the refrigerator and one slice in a cupboard to see which one grew faster. A cost-effective experiment for the science fair is presented here.

Preservatives in Bread

Bread with preservatives tends to have a higher acidity, which makes it less likely to mold. Preservatives are commonly used in commercial breads, while most organic and artisanal breads and baked goods do not contain them. Preservatives like as salt are another option. If you generously salt a piece of bread, mold will grow slower. If preservatives are the only factor, a slice of bread with preservatives will mold less fast than a slice without.

How to Keep Bread from Molding

Bread Basics

Store-bought loaves of bread generally contain a preservative to keep the molding process from beginning too early. Preservatives such as calcium propionate, for example, have an artificial odor (an antimycotic). Fungus growth is inhibited by antimycotics. Store-bought bread may sound intimidating, but if your bread machine is gathering dust in the corner, it’s often the most convenient option.

According to scientists whose entire job it is to study bread (yes, really! ), the molding process is slower when the bread is denser. As a result, white bread from well-known brands may start to mold more quickly than dense whole-grain bread, but this isn’t always the case. Preservatives are what actually matter.

Even whether you like store-bought whole grain bread or white bread, you can prevent it from molding.

Help for Mold

Mold is a disgusting fungus that should not be consumed. Bread will mold, no matter how many preservatives it contains. It doesn’t matter if you keep your bread in a bread box or on your kitchen counter; it will mold just as quickly. Mold will grow more quickly if you don’t use preservatives in your bread.

So, what’s the secret to not having your bread mold? Everything you need to make a meal, all in one place. Your fridge, to be precise.

Bread will last longer and remain fresh if it is kept in a cool, dark place. If you want to keep your bread fresh and delicious, your best chance is to put it in the fridge, where it will be protected from the effects of heat, humidity, and light.

Slowing the molding down by tightly closing the bread also helps. With your finger perforated by that little wire thing when you originally opened it, gently push the bag’s exterior to remove any air and re-tie it. Loaves of bread, whether baked or purchased from a bakery, can be stored in sealable bags. No matter what kind of bread you buy, it will keep fresher for longer.

Yes, you can freeze your bread, if you’d rather. Use only the amount you intend to use, then take slices out of the freezer and lay them out on a counter to come to room temperature with a napkin loosely covering them. Make sure to keep an eye on your bread because it thaws quickly and gets stale very quickly.

In order to avoid the problem of wet, mushy bread, keep the bread sealed and thaw it in the refrigerator at room temperature rather than in the freezer. Defrost or frozen settings on your fancy toaster are an excellent substitute.

Whether you make your own or buy it, keep these suggestions in mind to ensure that your bread stays fresh for as many joyful sandwich-making days as possible.

Mold on Wheat Bread vs. White Bread


Most people today prefer to buy their bread from a grocery store or a baker rather than making it themselves. Consequently, it is exposed to a variety of processes that the user may not even be aware of. ” Ingredients, processing circumstances, storage conditions, and the handling of the bread by all parties involved are the primary determinants of mold development rate on your bread.


Calcium propionate, a fungicide, is found in most commercial breads on the market today. Calcium propionate, a crystalline or powdered salt that is the result of the interaction of calcium hydroxide with propionic acid, is an organic salt. If this wasn’t added, the loaf of bread would be moldy by the time it reaches the store because of other preservatives. Preservatives can have a significant impact on how rapidly bread molds, regardless of whether it is white or wheat.

Water Activity

Another component that influences the rate of mold growth is the bread’s water activity, or the bread’s moisture content. Measure water activity by placing a small bit of bread in an airtight container and observing how much water evaporates. Bread has a water activity of about.95, whereas water has a value of 1, and bone-dry water has a value of 0. Once the water activity falls below.81, molds tend to proliferate more quickly. Preservatives are often added to bread to fight the growth of mold, which has a pH of 5.3 to 5.8.

Types of Mold

They include penicillium, rhizopus and nigricans as well as aspergillus and mucon on bread. Green, gray, white, and black are just a few of the many hues available for these molds. All of these molds can grow on both white and wheat bread.

Avoiding Mold

If you want to keep your bread fresh and mold-free, you should toast, refrigerate, or even freeze it. As a result of toasting, the bread’s water activity drops. Mold growth can be slowed by freezing and refrigerating food. Only buy what you need and freeze the rest for later use when purchasing fresh bread from a bakery, as preservatives may not be added.


How long does fresh bread take to mold?

After 7 to 10 days, you should witness a noticeable difference in the bread’s appearance. Depending on the sort of bread you used, you could notice growth in as little as five days. Remember that fresh bread deteriorates more quickly than preservative-laden store-bought bread.

Does white bread get mold?

White bread, on the other hand, may begin to mold sooner than dense whole-grain breads, but it’s possible that this isn’t the case. Preservatives are what actually matter. Even whether you like store-bought whole grain bread or white bread, you can prevent it from molding.

Can you eat moldy bread? - Eat Or Toss

Why does bread not mold anymore?

Preservatives are commonly found in breads sold in supermarkets, such as sandwich, loaf, and bakery breads. Bread can survive up to four days at room temperature without preservatives. Calcium propionate, sodium benzoate, potassium sorbate, and sorbic acid are all common preservatives used in baking.

Can you eat 3 month old bread?

Bread’s “sell by” dates indicate that it should be used within three to five days of opening, although it can actually be consumed much longer if there is no mold growth. Bread is easy to detect when it’s time to throw away because of the fuzzy, green specks on the surface.

Why does bread mold so fast?

Mold thrives at room temperature, between 68 and 72 degrees Fahrenheit (20 and 22 degrees Celsius). Bread is most susceptible to mold in this area, and it will spread the fastest. Mold growth slows when the temperature drops, and most molds die when the temperature drops below freezing.

Does bread mold grow faster in light or dark?

Mold does not require light as one of its primary resources for growth. Because mold is not photosynthetic and does not use light to generate energy, this is why it is unable to grow. To the contrary, a lot of mold thrives in a dark atmosphere because light from the sun can kill it.

Does bread mold faster in the fridge?

Refrigerating sliced bread (or any bread, for that matter) may slow mold growth, but author Wayne Gisslen claims that doing so actually accelerates the staleness of the bread. In fact, a loaf held at ambient temperature takes six times longer to bake.


The shelf life of white bread can be estimated by learning how long it takes for the bread to mold. White bread should be eaten within three to seven days of purchase.

If you keep your loaf correctly, you can dramatically extend its shelf life.

Moldy bread should likewise be avoided at all costs. Moldy bread can have a negative impact on the health of persons with impaired immune systems and respiratory diseases.

Helen Skeates

Helen Skeates

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.