Canning at high-altitude (3000 ft and greater above sea level) requires longer processing (boiling) times, as it takes longer for the jar contents to reach the temperature needed. Consult the USDA canning guide, or Ball Blue Book of Canning, for the graph of how much extra time is needed for your altitude. Be sure to add that extra time to the low-altitude amount of time - for example, in my area at roughly 4,600 ft, if I need 10 minutes to account for the altitude, I would add that to the 10 minutes already called for in the recipe for a total processing time of 20 minutes. Everything else re. the recipe will be the same. Enjoy!
Canning at high-altitude (3000 ft and greater above sea level) requires longer processing (boiling) times, as it takes longer for the jar contents to reach the temperature needed. Consult the USDA canning guide, or Ball Blue Book of Canning, for the graph of how much extra time is needed for your altitude. Be sure to add that extra time to the low-altitude amount of time - for example, in my area at roughly 4,600 ft, if I need 10 minutes to account for the altitude, I would add that to the 10 minutes already called for in the recipe for a total processing time of 20 minutes. Everything else re. the recipe will be the same. Enjoy!