Will Maple Syrup Mold?

If kept out of the refrigerator for a long period, maple syrup may get moldy. One interesting feature of maple syrup is that because of its high sugar content, mold only grows on the top layer and not inside. Therefore, save the maple syrup rather than throwing it away.

For ages, Vermonters have boiled their maple syrup, skimmed or strained out the mold, and then happily poured the syrup onto their pancakes. Can I do that? Probably. But I’m certain it’s not the “correct guideline,” much like the five-second rule. Reheating the syrup can destroy any mold or bacteria that may still be present if you are worried about mold. According to the most recent recommendations for food safety, reheating the syrup might not completely eradicate some types of mold. They advise to throw away syrup that has gone bad.

Maybe I’m just stuck in my ways, but I continue to utilize the time-tested skim and boil technique. For instructions on heating it and changing the sugar content as needed, see the section below.

The final maple syrup is cooked in the sugarhouse at a temperature between 180 and 200F. After being completely filled, the bottles are sealed with an airtight cap and turned on their side to destroy any bacteria that could be living on the lids.

Any mold or germs in your syrup will be destroyed by re-heating it to 180F, rendering it safe for consumption. As part of the water in the maple syrup evaporates, the amount of sugar will slightly rise, although most people probably won’t notice this. The mouthfeel and sweetness of the syrup could both be a little stronger. If it starts to crystallize because it gets too sweet, that would be a problem. Read the section below on how to verify and modify your syrup’s sugar content if you have any concerns.

WARNING: Keep an eye on the maple syrup while it is heating. As soon as you turn your back, the pot will go from heated to boiling over. The maple syrup will bubble up, spill over the edge of the saucepan, and ruin your stove. Ensure that you have butter or cooking oil on hand. The oil reduces surface tension, which causes the bubbles to burst quicker. It doesn’t need much—you could probably get by with a fork barely touching the butter. Seriously, around the size of 1/100th of a teaspoon. It’s very incredible!

When is maple syrup tapping and harvesting season?

In New England, the maple sugaring season typically begins in the late winter and lasts until the early spring. The first day of maple syrup tapping is not fixed. After a strong freeze, the sap of the sugar maple begins to flow. The greatest season to gather maple sap is when the nights are very cold and the days are sunny and moderately warm, averaging between 40 and 50 degrees Fahrenheit. Sap will flow slowly on days when these conditions are not met. When ideal circumstances are met, the sap will flow fast. A producer of maple syrup who collects sap in buckets may not even need to check the buckets on some days. On other days, make sure to check the buckets frequently to prevent overflow! There are just three to four weeks left in the entire sap collection season. It is time to stop gathering sap from the maple trees when the temperature stays above freezing or when the trees start to grow buds. The syrup will smell terrible and taste bad if it is created from sap that has been gathered after the maple trees have started to form buds.

How long does maple syrup last?

No, maple syrup never goes bad. This is brought on by maple syrup’s high sugar content. Once opened, maple syrup needs to be stored in the fridge to prevent mold from forming on it. If maple syrup develops mold, it can be safely and easily removed. Simply use a spoon to remove the mold from the syrup’s surface and throw it away. Straining the maple syrup through a piece of cheesecloth into a clean container is another method for getting rid of the mold. As opposed to maple syrup kept in a cupboard or other warm location, maple syrup maintained in a refrigerator is less prone to develop mold.

Does maple syrup need to be refrigerated?

Never spoils is maple syrup! This is a result of maple syrup having a high sugar content. After being opened, maple syrup should be stored in the refrigerator to prevent the growth of mold. If mold does develop on maple syrup, it can be safely and easily removed. Simply use a spoon to scrape the mold from the syrup’s surface and discard it. The maple syrup can also be strained through a piece of cheesecloth into a fresh container to get rid of the mold. When maintained in a cool environment, like a refrigerator, maple syrup is less prone to develop mold than when kept in a warm environment, like a cabinet.

I have a bottle of maple cream that had dark brown cream leak out of the jar and down the side. Is this normal and is the maple cream safe to eat?

The cream still tastes good. When maple cream separates, which happens frequently, it swells and may seep out the side. Keep in the fridge is the best defense against it.

How do you know when the maple syrup is done?

There are a few techniques to determine when maple sap has boiled for long enough to transform into syrup when creating maple syrup. A spoon test is the first step. Dip a spoon into the boiling sap and watch the sap (or syrup) trickle back into the pan to determine whether maple sap is nearly ready to turn into syrup. If the sap still has to boil longer, it will separate into individual droplets as it leaves the spoon. The syrup is nearly done when it begins to run off the spoon in a sheet or stream. At this time, it will also start to appear less like sap and more like syrup. If you believe the syrup is finished, remove it from the heat and allow it to cool somewhat. If it has turned into syrup, it should begin to thicken as it cools. The syrup can be heated again and cooked until it reaches the desired consistency.

One quart of maple syrup can be produced by boiling anywhere between five and thirteen gallons of sap in the production of maple syrup professionally. The syrup should be finished when it hits 219 degrees Fahrenheit, or 7 degrees over the boiling point of water (212 degrees F). This is uncertain though because the air pressure and weather affect the boiling point of water.

Using a hydrometer is the most accurate technique to determine whether maple sap has turned into maple syrup. A hydrometer is used to calculate the syrup’s sugar content. The sap turns into maple syrup when it has 66.9% sugar.

Maple syrup that is heated for an excessive amount of time will crystallize, and syrup that is boiled for an insufficient amount of time will degrade rapidly and be watery because the syrup’s sugar concentration is too low. Other maple products, such as maple sugar, maple butter, or maple candy, are created when maple syrup is boiled longer until it crystallizes.

Which maple tree do you get syrup from?

The type of sap used to make maple syrup typically comes from one of three main varieties of maple. This is due to the extremely high sugar concentration of the sap in these three kinds of maple. They are the red maple, the black maple, and the sugar maple (Acer saccharum) (Acer rubrum.) Due to their propensity to bud earlier than either sugar or black maples, red maples offer a shorter sugar season.

There aren’t many other types of maple that can be used to make sap that is used to make maple syrup. These include the bigleaf maple, the silver maple, and the Manitoba maple (Acer negrundo) (Acer macrophyllum.)

How long do you have to boil sap to make it into syrup?

“It depends,” is the response. How long it takes for maple sap to turn into maple syrup is not known with certainty. There are several causes for this. Each batch of boiled maple sap contains a varied amount of sugar. Sugar content in maple sap ranges from 1 to 5 percent. The syrup needs to be reduced to 66.9% sugar by boiling. Less sugar in the maple sap being boiled means that it needs to be boiled for a longer period of time than sap with more syrup. Since the sapsap contains between 95 and 99 percent water, the barometer and the weather might affect its boiling point.

In general, the effectiveness of the evaporator determines how long it takes to boil maple sap into maple sugar. Of 25 gallons of sap can be boiled every hour in a small evaporator (a pan about 2 feet by 6 feet in size), while a larger evaporator (6 feet by 18 feet) can boil up to 380 gallons.

Is maple syrup a good substitute for sugar?

A decent sugar replacement is maple syrup. One cup of maple syrup can be used in place of one cup of sugar while baking or cooking. To account for the excess liquid in the maple syrup, the amount of liquid in the recipe must be decreased by three tablespoons for each cup of maple syrup substituted. White sugar and maple sugar can be combined in equal amounts. Alternatively, use one cup of maple sugar in place of one cup of white sugar.

Because they are less processed than white sugar, maple syrup and maple sugar have more minerals and antioxidants than white sugar, which may have health benefits. While keeping in mind that maple syrup has the same amount of sugar as white cane sugar, keep in mind that it also adds a delightful flavor to baked goods and cooked foods that sugar cannot!

Does maple syrup have potassium in it?

42 milligrams of potassium are found in one spoonful of maple syrup. In addition to potassium, maple syrup also has calcium, zinc, manganese, magnesium, and iron. More of these minerals are present in darker maple syrup. Additionally, the vitamins B1, B2, B5, B6, biotin, and folic acid are present in trace amounts in maple syrup.

How can mold on maple syrup be avoided?

Before usage, empty containers must be kept in a tidy, dry location. To help prevent spores and other debris from entering, they should ideally be maintained upside down and in their original container.

The glass, plastic, tin, and caps used to package maple syrup are comprised of fresh, food-grade materials and normally leave suppliers clean. These containers’ surfaces are not sterile, though. Regardless of how they are kept, the container’s inside and exterior surfaces could be covered in mold spores. By preheating the containers before filling them, you can aid in the reduction of mold.

Small to medium volume glass containers can be difficult to manage mold growth in while hot packing. Glass that is thicker than that used in normal containers is frequently used to create new, creative containers. These containers, if not preheated, can quickly reduce the temperature of hot syrup to levels insufficient to destroy any spores that may be present inside the bottles and cap liners.

Container types

The kind of container can affect how much mold grows in maple syrup. Traditional high density polyethylene (HDPE) plastic containers for storing maple syrup have thick walls that are relatively permeable to oxygen, which promotes the growth of mold. A polyvinylidene chloride copolymer (“XL coating”) is applied to the outside surface by some manufacturers to act as an oxygen barrier. Use of a bottle with this coating can reduce the amount of mold that develops after packing.


Containers for maple syrup must be properly sealed. Producers must take care to ensure that containers are properly sealed when packing maple syrup.

Containers that aren’t properly sealed let oxygen in, which promotes the growth of mold. Poorly fitted lids or makers over- or under-torquing the container lids might result in a poor seal.


There is a lot of sugar in maple syrup. Water molecules are “bound” by the sugar molecules in maple syrup, which limits the amount of water available to enable mold growth. Many Ontario maple syrup producers aim for a minimum density of 66.5 Brix or somewhat more rather than the minimal regulation standard of 66 Brix. This aids in preventing the growth of molds, which are restricted as a result.

Storage temperatures

Mold grows best in conditions that are normal. All syrup ought to be kept in a setting that is continually chilly.

Maple syrup’s potential mold growth is slowed or prevented by refrigeration or freezing. Consumer containers of hot packed maple syrup should have labels that state “Refrigerate/Freeze after Opening.”

Syrup that is cold packed but will be heated up later needs to be kept cold or frozen. Storage instructions should be prominently displayed on the labels of consumer containers of cold packed goods, and syrup in consumer containers should be quickly chilled or frozen.

Can maple syrup with mold make you sick?

Real maple syrup was never available to us while we were traveling in Mexico on the Que Tal; instead, we had to settle with knockoff brands like Log Cabin and Mrs. Butterworth. These I never chilled, and a bottle would remain good for however long it took us to consume it—usually more than a year. Maple syrup just never needed to be refrigerated, even in hot climates.

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I splurged this winter and purchased a little bottle of genuine maple syrup when sailing on Barefoot Gal. And no, I didn’t put it in the fridge. Our refrigerator is incredibly small, and I only use it for things that need to be kept cold.

I took the bottle of syrup out of the storage container and used it to make French toast for breakfast the day before. I initially believed that part of the sugar on top had solidified. Then I gave it another glance.

Although most people do keep real maple syrup in the refrigerator, I had always believed that it wasn’t necessary to do so.

When I searched the subject, I learned that, indeed, real maple syrup will spoil if it isn’t refrigerated. The University of Vermont Extension Service claims that it is not a harmful mold and that you may skim it off, heat the syrup, and then skim the top again to utilize it. Cornell University has further information on the fungus.

I suppose I’ll just put my actual maple syrup in the refrigerator since I’d rather not deal with all that. I will purchase the imitation syrup if I don’t have space in the refrigerator because it contains enough preservatives to be left out.

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