Temperature and Mold

At What Temperature Does Mold Grow?

There is a common misconception that mold only grows during the warm summer months, but this isn’t the case. Temperature indeed plays a significant role in mold developments, but it’s not entirely a seasonal issue. Mold can thrive all yea round under certain conditions, presenting a smelly, unsightly, and health-threatening problem. Knowing where to look during the different seasons of the year can help you eliminate the threat of mold before it leads to disaster.

In this post, we’ll discuss at what temperature does mold grow, and the relationship of climate and mold growth.

A General Overview of Mold Growth And Temperature

Mold needs oxygen and water to grow, but it also requires a bard source and compatible temperature to really thrive. Even when ideal conditions aren’t available for mold growth, it’s possible for mold spores to go into a dormant resting state until things change in their favor.

At What Temperature Does Mold Grow?

Generally speaking, mold can’t grow if the temperature dips below forty degrees Fahrenheit. For this reason, many refrigerator settings are set at thirty-nine degrees. An ideal temperature for mold growth is between seventy-seven to eighty-six degrees Fahrenheit, especially when there is a lot of humidity in the air.

At What Temperature Does Mold Die?

Temperatures have to rise above one hundred degrees or below freezing to effectively kill mold spores. However, such extreme conditions are rare in most places, making natural eradication of mold through temperature control a challenging strategy.

Mold growth is dangerous and its removal should be handled by a specialist. Call us at (877) 349-1231 for a free consultation with a licensed remediation expert available 24/7 near you.

Do You Need Mold Remediation?

Answer a few short questions and find out now!

temperatures and mold

The Essentials for Mold Growth: Organic Matter and Ideal Conditions

Mold thrives when it finds the right food source, growing on materials or in areas rich in organic matter. This makes it very difficult to remove mold from an environment that has an excess of pet dander, dust, dead skin cells, and other airborne particles that nourish a mold colony. Mold requires both water and oxygen to survive, yet it needs only a minimal amount of oxygen. This combination of needs frequently results in mold being found in basements, attics, under-sink cabinets, HVAC ductwork, and bathrooms.

Health Effects of Mold Growth

Mold can do serious damage to your home – from ruining your carpet, causing drywall to bubble and deteriorate, creating stains on ceiling tiles, or infesting ductwork. More importantly, long-term exposure to mold spores can also cause health problems. People typically display respiratory conditions when exposed to mold spores with symptoms like asthma, wheezing, coughing, and fatigue. Symptoms of toxic ingestion can also cause headaches, runny nose, watering eyes, and rashes. The impact mold has on your health makes it a priority to address it, no matter what season you are in. Fortunately, Mold Remediation’s 24/7 hotline connects you with certified, licensed, bonded and insured mold remediation companies in your immediate area.

mold remediation companies

Cold Temperatures and Mold Growth

So long as there is enough moisture in the air, a bard source, and the right temperature, mold can still grow during the colder months. Although the temperatures drop during the winter time, does not mean mold can’t stop growing. During the colder months, most people tend to have the thermostat setting between 60 and 80 degrees Fahrenheit in their homes, creating a climate where mold can thrive.

cold temperatures and mold

Not all parts of the United States experience freezing temperatures throughout the winter, making it difficult to completely kill mold spores. The extreme variations in the winter, especially when dropping below 32 degrees Fahrenheit, are damaging, but the spores may not die. They can also remain dormant until the house warms up in the warmer months, at which point they emerge from hibernation. Temperature alone isn’t enough to tackle a problem with mold. You also need to treat the source of mold and employ preventive measures. 

Increasing Moisture

As fall transitions to winter, dew and precipitation rise, leaving films of water on various surfaces around a home. Window panes become prime spots for moisture accumulation, offering mold spores the chance to grow. During winter, windows attract significant condensation when warm indoor air meets the cold glass, cooled from the outside. This interaction deposits water vapor on surfaces, making mold more visible along window frames and sills.

Persistent Allergy Symptoms from Mold Growth

allergies to mold

Because people spend more time indoors when the weather is cold, you may notice that your allergy symptoms increase during the wintertime. This can potentially lead you to discover a problem with the air quality in your home. Additionally, running your heat may disperse the spores throughout other areas of the home, making it harder to get away from the problem.

mold growth temperature

Warm Temperatures and Mold Growth

The temperature during the summer months generally accelerates the growth of the mold. Not only is the air warmer, but more frequent rain and higher humidity increase the likelihood of colony growth. Few locations across the United States see heat temperatures that exceed the minimum requirement to stifle and kill growth, leaving many exposed to the potential infestation.

hot temperatures and mold

Ventilation Issues and Moisture Buildup 

If your home has poor ventilation, you may have an increase in humidity and a need to get rid of mold in your ducts. Proper air circulation is essential to move vapors effectively, and restricting this flow can cause condensation to accumulate. This often happens on windowsills, basement windows, or other areas where the cooler indoor air meets external heat. Many times, an HVAC unit will extract a certain amount of water from the air, but if the unit is older and doesn’t route the water to a free-flowing drain, there is a greater likelihood of leaks or overflowing drip pans. This presence of moisture creates an opportunity for mold.

The Spread of Mold Growth 

Summer is the perfect temperature for mold growth, but the breezes and winds that come through are also ideal for carrying mold spores around the house. Mold will thrive on soggy carpet or cardboard, inside ductwork, on insulation, or the wooden support structures of your home. It grows and multiplies quickly, putting your health and home in danger if left unaddressed. Wherever you have dark places in your home, you need to be more vigilant in checking for the presence of mold. You may end up smelling the musty odor before you see visible signs of growth, but you can be on the lookout for signs of a water leak or water damage.

Roofs and Exterior Mold Growth 

roof with mold growth

You might be amazed by the various places mold can find to grow during the summer. A windstorm could not only dislodge roofing tiles or cause a branch to break through the roof, allowing rainwater inside, but also, accumulated debris and leaves in the gutters can obstruct rainwater flow. This blockage can lead to water overflowing and flooding the roof, creating ideal conditions for mold to thrive on top of your home.This excess water can force its way in through the seals and cracks along the roofline, dripping water into the attic. However, the same debris and dead leaves in the gutter can also breed mold underneath, and the spores can be swept through the air and land on other places to start new colonies. 

Mold Growth in Small and Dark Areas 

Watch for signs of mold growth in crawl spaces under the house or in your basement, especially during rainy periods. Water and moisture can get trapped in these dark areas and breed mold quickly. You may notice the musty odor when walking around the house or coming up from under the floor vents. Small animals or rodents that get under the house can also tear holes in ductwork, leaving it exposed to additional moisture. Thoroughly clean around your HVAC unit to prevent debris from building up and decaying around the system. This reduces the possibility of mold spores getting caught in the circulation and forced throughout your home.

Year Round Mold Remediation

Mold should be addressed immediately upon suspicion of its growth. Growth occurs rapidly when the conditions are right, so whether rain, snow, sleet, hail, or blistering sun, you need a game plan to address mold. Contact MoldRemediation.io to ensure that your problems are addressed appropriately, and so that serious damage and health concerns are avoided.

what temp kills mold