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Adjust canning processing times and pressure for your altitude. Covers boiling water bath and pressure canning with USDA-based altitude correction tables.
Altitude adjustment for canning compensates for the lower boiling point of water at higher elevations. As altitude increases, atmospheric pressure decreases, requiring longer processing times or higher pressures to safely preserve food.
| Altitude | +Time (WB) | +PSI (PC) |
|---|---|---|
| 0–1,000 ft | +0 min | +0 PSI |
| 1,001–2,000 ft | +5 min | +1 PSI |
| 2,001–4,000 ft | +10 min | +5 PSI |
| 4,001–6,000 ft | +15 min | +10 PSI |
| 6,001–8,000 ft | +20 min | +10 PSI |
| 8,001–10,000 ft | +25 min | +15 PSI |
Formula
Boiling Point ≈ 212°F − (Altitude ÷ 500) × 0.9°F212°F = boiling point of water at sea level
Altitude = elevation above sea level in feet
Worked Example
Adjust jam recipe at 5,000 ft elevation
Did you know? Denver, Colorado (5,280 ft) is often called the 'Mile High City' — water boils there at about 202°F instead of 212°F, which is why USDA canning guidelines always specify altitude adjustments (source: USDA Complete Guide to Home Canning).
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