Dear Home Ec 101,
I used to live about as close to sea level as one can get, but recently we moved to the mountains of New Hampshire. Do I have to worry about the high altitude directions?
High on the Hog
At sea level air there is about 14.7 lbs of air pushing down on everything. As you journey skyward this pressure is diminished affecting things such as the boiling point of water and evaporation (we are keeping this simple, folks). With less pressure carbonation expends itself more quickly as the carbon dioxide outgasses from liquid. Baking soda and powder work more quickly causing cakes and muffins to possibly need to be baked at a higher temperature. Around 3,000ft above sea level these variables can drastically affect some recipes.
Homebaking.org has a fantastic chart with suggested adjustments for high altitude cooking.
Best of luck in your new home.