How Long Can Home-Canned Foods Last on the Shelf?

Understanding the Basics of Home Canning

Home canning is a popular method for preserving fruits, vegetables, and meats. The key to successful canning is to ensure that the food is heated to a high enough temperature to kill off any bacteria that may be present. This process is called “sterilization.” The recommended canning procedures involve processing the food at 212°F (100°C) for a specific amount of time, usually 10 to 30 minutes, depending on the type of food and the altitude.

Altitude Adjustments for Canning

For every 1,000 feet (305 meters) above sea level, the boiling point of water decreases by 1.8°F (1°C). This means that at higher altitudes, the canning time needs to be adjusted to ensure that the food is heated to a safe temperature. A common rule of thumb is to add 1 minute to the canning time for every 1,000 feet (305 meters) above sea level. For example, if a recipe calls for 10 minutes of processing time at sea level, you would need to process the food for 11 minutes at 2,000 feet (610 meters) above sea level.

Common Home Canning Times and Altitude Adjustments

Here are some common canning times and altitude adjustments for different types of food:

• Fruits: 10-20 minutes at sea level, add 1 minute for every 1,000 feet (305 meters) above sea level
• Vegetables: 10-30 minutes at sea level, add 2 minutes for every 1,000 feet (305 meters) above sea level
• Meats: 30-60 minutes at sea level, add 4 minutes for every 1,000 feet (305 meters) above sea level

Note: These are general guidelines and may vary depending on the specific recipe and canning method used. Always consult a reliable canning resource or the USDA’s Complete Guide to Home Canning for specific guidance on canning times and altitude adjustments.