Adjust Canning Time for Altitude
Most people realize that canning is a lot like baking, you must adjust your canning time based on the altitude of where you live.
Fruits and vegetables can be safely canned in a boiling water bath or pressure cooker. However, because the temperature of boiling water is lower at higher elevations, you need to increase the processing time. For example, water boils at 212 degrees Fahrenheit up to 1,000 feet elevation; at 203 degrees F at 5,000 feet; and 194 degrees F at 10,000 feet.
The lower boiling point temperatures that result at higher altitudes mean that foods might not be getting heated up enough to be safely stored when you attempt to preserve them at higher elevations. This is corrected by increasing the amount of time that the jars spend in the boiling water bath. When you use a pressure canner, you adjust for altitude by increasing the pressure and sometimes the time.
For altitudes of 1,000 feet or less use the base canning processing time listed on your recipe, however if you live at altitudes above 1,000 feet use the following chart to adjust your processing time.
| Altitude | Increase Processing Time |
|---|---|
| 1,001 to 3,000 Feet | 5 Minutes |
| 3,001 to 6,000 Feet | 10 Minutes |
| 6,001 to 8,000 Feet | 15 Minutes |
| 8,001 to 10,000 Feet | 20 Minutes |
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