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When you’re canning at an altitude higher than 1,000 feet above sea level, you need to adjust your processing time (see Table 4-1). Because the air is thinner at higher altitudes, water boils below 212 degrees. As a result, you need to process your food for a longer period of time to kill any microorganisms that can make your food unsafe.

TABLE 4-1 High-Altitude Processing Times for Water-Bath Canning

Altitude (in feet)	For Processing Times Less Than 20 Minutes	For Processing Times Greater Than 20 Minutes
1,001–1,999	Add 1 minute	Add 2 minutes
2,000–2,999	Add 2 minutes	Add 4 minutes
3,000–3,999	Add 3 minutes	Add 6 minutes
4,000–4,999	Add 4 minutes	Add 8 minutes
5,000–5,999	Add 5 minutes	Add 10 minutes
6,000–6,999	Add 6 minutes	Add 12 minutes
7,000–7,999	Add 7 minutes	Add 14 minutes
8,000–8,999	Add 8 minutes	Add 16 minutes
9,000–9,999	Add 9 minutes	Add 18 minutes
Over 10,000	Add 10 minutes	Add 20 minutes

If you live higher than 1,000 feet above sea level, follow these guidelines.

 For processing times of less than 20 minutes: Add 1 additional minute for each additional 1,000 feet of altitude.

 For processing times of more than 20 minutes: Add 2 additional minutes for each 1,000 feet of altitude.

If you don’t know your altitude level, you can get this information from many sources. Try contacting your public library, a local college, or the cooperative extension service in your county or state. Or go to www.whatismyelevation.com and simply type in your Zip code.