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Altitude Adjustments & Altitude Chart

The boiling water and steamppressure processing guidelines in this book are for altitudes at or belwo 1,000 feet above se leel. Adjustments must be made if processing is completed at higher altitudes. Because air is thinner at igher altitudes, both pressures and boiling points are affected. Water will boil at temperatures well below 212 degrees Feet altitudes greater than 1,000 feet above sea level. This means with both the boiling water and the steam-pressure canner methods, adjustments in processing must be made. With the boiling water method, additional processing time must be allowed. With the steam-pressure method, additional pressure is required. The Altitude chart below gives requirements for both methods ar various altitudes.

If you do not know the altitude for your location, contact your count or state Cooperative Extension Service. Alternative sources for this information are your local Soil Conservation Services and your local library.