Skip to Content

Moldy Banana Bread [What You Need to Know]

My great-aunt loves to bake, and she has always been very generous with sharing her baked goods, so when she gave me banana bread, I was overjoyed.

After a day or two, I decided to slice some of the banana loaves, but the slices were off-color and smelled strange.

What went wrong?

Why was my aunt’s banana loaf so foul and smelly? After the first bite, I wisely threw the bread away—it was moldy.

Not wanting this to happen again, I began to investigate all about moldy banana bread.

Why Does Banana Bread Go Moldy?

Fresh banana bread will last a few days in the bread bin and up to a week in the fridge. After this, you will notice black spots and moldy streaks as the bread starts to decompose due to bacteria and mold spores taking root. Banana bread that has black spots and gray fluffy colonies of mold spores becomes toxic to people and should not be eaten. Mold thrives in warm and moist places, such as banana bread in the bread bin. Freezing is the best way to store a banana loaf for later use.

Moldy Banana Bread
Moldy Banana Bread

Banana Bread Mold and Why It Forms

Identifying whether your bread is off is important to prevent food poisoning or other health complications you may suffer after eating mold.

My aunt had never before sent me moldy banana bread, so I was quite confused. How had mold grown so fast, and why did it get onto the bread in the first place?

Mold travels by spores that are released into the air.

When these spores settle on a moist and nutrient-rich surface, such as my aunt’s banana bread, they will soon start to reproduce and grow exponentially.

Which mold grows on the banana bread may be any of the many different mold families, and none of them are good.

Moldy Banana Bread is no longer safe to eat
Moldy Banana Bread is no longer safe to eat

So my aunt’s banana bread could have grown Aspergillus, Penicillium, Mucor, and even Rhizopus.

Fungi and mold are related, and mold spores from Rhizopus can lead to serious respiratory issues when inhaled, such as when opening a packet the banana bread.

If you are allergic to mold spores, then simply sniffing the bread to smell whether it is off can lead to respiratory infection and distress.

Eating moldy banana bread can lead to anaphylaxis.

Identifying Moldy Banana Bread

If you have a keen sense of smell, you will be able to detect the trace smell of mold before the spores become visible.

The faint whiff of sour and off banana bread is easy to detect as banana bread should smell sweet and delicious.

Opening my aunt’s bread, I instantly saw darkened corners that had a distinctive fluffy appearance—mold colonies.

Banana bread gets moldy quickly because mold loves to grow in sugar rich food
Banana bread gets moldy quickly because mold loves to grow in sugar-rich food

Mold may also get inside the banana bread so that it may seem fine on the outside but be moldy on the inside.

In this case, the mold was a grayish-green color, but mold spores can take on any number of colors, from yellow to green, brown, white, and black.

The color and shape of the mold colony will depend on the subtype of mold, temperature, and texture and type of bread.

What to Do With Moldy Banana Bread

Sadly, once banana bread has shown signs of being moldy, it is best to throw away the whole loaf.

Never try to save slices because they don’t look moldy.

Remember that mold will develop micro-roots and spores that may be invisible but present in the rest of the bread.

The risk of ingesting mycotoxins that are produced by the mold is too great, and eating these can really make you sick and lead to food poisoning.

Mold thrives in warm humid conditions that exist in a bread bin
Mold thrives in warm humid conditions that exist in a bread bin

How to Prevent Mold Forming on Banana Bread

Ensuring your banana bread remains fresh, and mold-free is relatively easy. Use these tips and have delicious mold-free banana bread ready to eat.

Freeze Banana Bread

If you know you won’t be able to eat all of the banana bread in a few days, be sure to freeze it immediately when you get it.

Freezing banana bread is as easy as letting the freshly baked loaf cool, slicing, wrapping the loaf in aluminum foil, placing it in a plastic packet, and then in the freezer.

To defrost the banana bread, simply remove it from the freezer and leave it in the fridge overnight.

If you slice the banana bread before freezing, you can remove as many slices as you need, warm them in the toaster, and serve hot.

The benefit of freezing banana bread is that mold can’t grow in the fridge.

Freezing is the best way to store banana bread
Freezing is the best way to store banana bread

Keep the Banana Bread Airtight

Mold needs oxygen to grow, so keeping the banana bread in an airtight container or vacuum wrapping slices will help stop mold from growing.

When saving banana bread in the bread bin, you can also wrap the loaf in aluminum foil to keep the freshness in and the mold spores out.

Keep Your Kitchen Mold-Free

The mold on your banana bread came from somewhere, so be sure to keep your kitchen mold-free.

This means rinsing your bread bin, cutting boards, loaf tins, and tea towels with anti-mold cleaning solutions.

If you’re stuck, white vinegar in water with some dishwashing liquid is a great mold cleaner.

Frequently Asked Questions About Moldy Banana Bread

What happens if I eat moldy banana bread?

Eating moldy bread can make you sick, especially if you have a preexisting allergy to mold or mold spores. An allergic reaction to mold could send you into anaphylactic shock, and you may require emergency care in a hospital.

Is it safe to use moldy bananas for banana bread?

Never use moldy bananas for making banana bread. Instead, ripen the bananas to the point that they are ready to use in the banana bread, then freeze the pulp until you are ready to make the bread. This will ensure your banana pulp is ripe, but not moldy.

Why did my banana bread get moldy?

Banana bread can quickly become moldy as mold loves growing in sugar-rich food that is moist and kept in a warm place—aka banana bread. Take care to let your banana bread cool fully before wrapping to decrease the chance of mold spores germinating.

Conclusion About Moldy Banana Bread

Moldy banana bread is such a disappointment. I was utterly devastated when my great aunt’s banana bread spoiled, and I had to throw it away.

Be sure that any banana bread you eat, or any other bread for that matter, is free of mold.

Inspect it visually, sniff it, and if the bread tastes bitter or strange, discard it, as taking a chance at food poisoning isn’t worth it.