The boiling point of water decreases roughly 1 degree Fahrenheit for every 550 feet rise in altitude.
For example, a 3-minute egg at sea level is actually a 5 - 6 minute egg in Boulder, Colorado.
The boiling point of water varies with elevation as follows -
|Sea level||212.0 degrees Fahrenheit|
|3000 feet||206.4 degrees Fahrenheit|
|4000 feet||204.6 degrees Fahrenheit|
|5000 feet||202.8 degrees Fahrenheit|
|5500 feet||201.9 degrees Fahrenheit|
|6000 feet||201.0 degrees Fahrenheit|
|7000 feet||199.2 degrees Fahrenheit|
|8000 feet||197.5 degrees Fahrenheit|
|9000 feet||195.7 degrees Fahrenheit|
|10000 feet||194.0 degrees Fahrenheit|
Blanch vegetables for freezing the specified number of minutes plus 1/2 minute more for each 1000 feet over 2000 feet above sea level.
There is a wide variation in needs. Cakes with sturdy structure may need no changes; cakes with delicate structure cannot be adapted. In general, for the Boulder, Colorado elevation of 5,500 feet, try reducing sugar 3 tablespoons per cup called for in the recipe.
Reduce the finish temperature of candy by the difference between the temperature of boiling water at sea level and the current elevation. For example, if the finish temperature is 236 degrees, subtract 10 degrees (for Boulder) to get 226 degrees.
For foods processed in a boiling water bath for 20 minutes or less -
For foods processed in a boiling water bath for over 20 minutes -
For foods processed in a pressure canner -
If the recipe values cause them to be too thin and crisp, add 1 ... 2 tablespoons of flour.
Use flat sheets with shallow sides.
Use only shiny cooking sheets. Dark sheets cause burning.
Pans should be at least 2 inches smaller than the inside of the oven on all sides to allow good circulation.
In general, deep fat fried foods brown too much before the food is done. Try decreasing the temperature 2 ... 3 degrees for each 1000 feet above sea level.
Cook jellies to a temperature of 8 degrees above the current boiling point of water.
Cook jams to a temperature of 9 degrees above the current boiling point of water.
The 'sheet' test from a metal spoon remains the same at all elevations.
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