Candy Temperature Altitude Calculator

Water boils at a lower temperature as elevation rises because air pressure drops. Sugar syrups and frying oils reach each stage at that lower boiling point, so a recipe written for sea level will overcook if you follow it exactly at altitude.

Subtract about 1 F for every 500 feet of elevation. At 5000 feet that is 10 F, so a hard-crack target of 300 F becomes 290 F. The same shift applies to soft-ball, firm-ball and other candy stages.

Yes. Frying oil heats above the boiling point of water, but the practical doneness cues still shift with altitude, so many cooks lower the target a few degrees. Use a thermometer and watch the food rather than relying on time alone.

Yes. The adjusted temperature tells you the number to aim for, but you still need an accurate thermometer to hit it. The cold water test, dropping syrup into cold water to judge the stage, is a useful backup check.

No. This is a food preparation guideline based on a common rule of thumb. Local pressure, weather and thermometer accuracy all vary, so treat the adjusted number as a starting point and confirm the stage by feel or a cold water test.