If you live above 1000 feet elevation you need to figure your altitude adjustments for both water bath and pressure canning. As your altitude goes above 1000 feet above sea level the atmospheric pressure is reduced. This causes water to boil at temperatures lower than 212 degrees Fahrenheit.
For safety in water bath canning you must bring the contents of your jar to at least 212 degrees Fahrenheit. To compensate for the temperature difference you must increase processing time.
The pressure canner is also affected by atmospheric pressures. A pressure canner must reach a temperature of 240 degrees Fahrenheit in order to stop botulism. To compensate for altitude differences, you must increase the amount of pressure used. The time does not change, only the pressure used.
So.... As you go up in elevation, Waterbath, increase time. Pressure Canner increase pressure.
Time and pressure information given in the recipes on this site is for elevations of 1000 feet or less unless otherwise noted make changes according to the charts below on this page.
What if you don't know your elevation? A Simply Canning Facebook reader shared this site... it worked perfect for me. Enter your address and find your elevation. http://veloroutes.org/
Another option is to do a search for "your town, your state, altitude". In my case the first result was a Wikipedia article that included the elevation of my town.
Another good option is to call your county extension agency and they may have some information for you. This link to the Cooperative Extension System has a general listing of extension services by state here in the US. If there is no office listed for your town, just find the next closest one.
Be aware of altitude changes if you live in mountainous areas.
|Adjustment for Pressure Canner|
|Altitude in Feet||Dial Gauge Canner||Weighted Gauge Canner|
|Altitude Adjustments for Boiling Water Bath Canner|
|Altitude in Feet||Increase processing time|