Does Bleach Freeze?

Did you ever wonder if bleach freezes or not?

Here is the answer!

Yes, bleach can freeze. The freezing point of bleach depends on its concentration. Household bleach, which is typically around 6% sodium hypochlorite, will freeze at around 20 degrees Fahrenheit (-7 degrees Celsius). Stronger bleach solutions will freeze at lower temperatures.

Understanding Freezing Points

To grasp whether bleach can freeze, we first need to understand the concept of freezing points. The freezing point, in essence, is the temperature at which a liquid transforms into a solid. For water, one of the most common substances that can exist as a liquid and a solid, the freezing point is 32 degrees Fahrenheit (0 degrees Celsius).

The Chemical Composition of Bleach

Bleach typically consists of water (acting as the solvent) and sodium hypochlorite (the active ingredient). The concentration of sodium hypochlorite in bleach varies, with household bleach generally containing around 6% sodium hypochlorite. Understanding this chemical makeup is crucial, as different compounds solidify at different temperatures.

Freezing Point of Sodium Hypochlorite

Sodium hypochlorite boasts a lower freezing point than water. While water freezes at 32 degrees Fahrenheit (0 degrees Celsius), sodium hypochlorite solidifies at approximately 19 degrees Fahrenheit (-7 degrees Celsius). This means that bleach can indeed freeze, but the exact temperature at which it transitions to a solid state depends on the concentration of sodium hypochlorite.

Can Household Bleach Freeze?

Household bleach, a mixture of water and sodium hypochlorite, can indeed freeze under specific conditions. In regions like the United States and Canada, where winter temperatures can plummet significantly, you may find that bleach left in unheated storage areas or vehicles has turned into a solid.

Effects of Freezing on Bleach

When bleach freezes, it can undergo some changes. The sodium hypochlorite may separate from the water, resulting in a white precipitate. This separation can affect the bleach’s concentration and, consequently, its efficacy. Thus, if you discover frozen bleach, it’s a good practice to thoroughly mix it after it thaws to ensure that it maintains its cleaning power.

Preventing Freezing

To prevent your bleach from freezing, especially during the winter months, ensure that you store it in a temperature-controlled environment. Keep it indoors, away from extremely cold conditions, or employ insulated containers if you need to transport it in freezing weather. By taking these precautions, you can safeguard that your bleach remains in its liquid form and is ready for use.

Does Freezing Affect Bleach?

Bleach loses its potency quickly when exposed to heat. You should use bleach within a week after opening the container.

What is the Freezing Point of Bleach?

Bleach freezes at 25  degrees Fahrenheit.

At What Temperature Does Bleach Freeze?

Bleach freezes at a lower temperature than water. Liquid bleach usually freezes at around 25 degrees Fahrenheit. But, if your product is stored in an insulated container, then it may be able to stay frozen for more extended periods.

Bleach is more potent than regular chlorine because it contains more chlorine. Chlorine is used to kill bacteria and viruses. Bleach is used to kill algae and other organisms that may cause problems in your pool. You should buy bleach instead of regular chlorine if you want immediate results. Chlorine is cheaper than bleach. Even if people use a lot of bleach, it will still be less expensive to buy chlorine instead. Convenience – Chlorine is easier to mix compared to bleach because you only need to measure the right amount of bleach to add to water.

Check our freezing guides


Bleach freezes when exposed to cold temperatures. Bleach is used to kill germs and bacteria. Bleach works by damaging cells’ DNA. Bleach also damages the cell walls of microorganisms, causing them to rupture and leak out of the body. Bleach is less toxic than other disinfectants because it doesn’t harm human tissue. Bleach is often used in swimming pools and hot tubs.


  1. What happens to bleach when it freezes?
    When bleach freezes, it undergoes expansion, which can potentially damage equipment. However, these frozen solutions can be thawed without affecting their quality. Under specific conditions, especially for solutions containing more than 10% sodium hypochlorite, the freezing of sodium hypochlorite solutions may lead to the precipitation of sodium chloride.
  2. What temperature will bleach freeze?
    The freezing point of a 12% Sodium Hypochlorite solution is 15.3 degrees Celsius or 27 degrees Fahrenheit, resulting in a freezing point of -15.3 degrees Celsius or 5 degrees Fahrenheit.
  3. Can bleach be stored below freezing?
    It’s advisable to store bleach at room temperature and avoid exposing it to freezing or extremely hot conditions. Typically, this means storing bleach indoors rather than in a garage or storage shed.
  4. What temperature does sodium hypochlorite freeze?
    Sodium hypochlorite solidifies or freezes at a temperature of 18 degrees Celsius.
  5. What temperature does bleach deactivate?
    Bleach, or Sodium Hypochlorite, breaks down more rapidly in hot water, but its decomposition temperature is slightly higher than the boiling point of water, making it significantly hotter than typical domestic water supply temperatures.
  6. Will vinegar freeze?
    Yes, you can freeze vinegar, regardless of its type, as it contains a substantial water content, resulting in a relatively high freezing point.

Here are some links to websites where you can learn about bleach and freezing:

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Adila Zakir

Adila Zakir (USA Federal Drug Authority Certified) Studied medical and medical-related business at the same time Overcame search lethargy Worked for medical search and business marketing consultation Expert in medical writing and has special interest in immunity boosting foods.

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