NSF Recommends Safe Methods for Thawing Frozen Food

NSF Outlines Safe Thawing Practices for Frozen Food

The National Sanitation Foundation (NSF), which develops public health standards to protect food and water, recommends three specific methods for safely thawing frozen food, according to Safety+Health Magazine on May 15, 2026. This guidance aims to prevent bacterial growth by avoiding the danger zone of 40º F to 140º F, where bacteria can multiply rapidly.

Thawing in the Refrigerator

For the refrigerator method, place packaged frozen food in a shallow dish on the bottom shelf to prevent cross-contamination from drippings, as advised by the NSF. This approach requires about four to five hours per pound of food and ensures even thawing without entering unsafe temperature ranges.

Thawing in Cold Water or Microwave

The NSF suggests thawing in cold water by placing the packaged food in a pan and changing the water every 30 minutes, which takes approximately 30 minutes per pound but should only be used if the food is cooked immediately afterward. Alternatively, for microwave thawing, follow the owner’s manual for minutes per pound and power level, rotating the food regularly for even results, and cook it shortly after defrosting, according to the same source.

Key Safety Measures

Regardless of the method, the NSF emphasizes checking the internal temperature of the food multiple times to ensure it does not enter the 40º F to 140º F danger zone, where bacteria that cause foodborne illness can multiply rapidly. As widely known in food safety contexts, proper thawing is essential for maintaining public health standards in environments like workplaces handling food.