How to can mushrooms, whole or sliced: time & pressure by the book
Mushrooms, whole or sliced is low-acid, so pressure canning is the only safe method — here are the USDA processing times and how the pressure changes with elevation.
How long do you can mushrooms, whole or sliced?
USDA processes mushrooms, whole or sliced for 45 minutes for half-pints and 45 minutes for pints, at the pressure for your altitude and gauge (below). Pints only — USDA does not approve quart-sized mushrooms (heat penetration).
What pressure for your altitude?
With a weighted gauge, use 10 psi up to 1,000 ft and 15 psi above that. With a dial gauge, use 11 psi to 2,000 ft, 12 psi to 4,000 ft, 13 psi to 6,000 ft and 14 psi to 8,000 ft. Start timing only once the canner has vented 10 minutes and reached pressure.
Why mushrooms, whole or sliced is pressure canned
Mushrooms, whole or sliced is a low-acid food (above pH 4.6), so a boiling-water bath cannot reach the temperature needed to destroy Clostridium botulinum spores. It must be pressure canned. Water-bath or “oven canning” a low-acid food is a botulism risk.
FAQ
How long do you can mushrooms, whole or sliced?
USDA processes mushrooms, whole or sliced for 45 minutes for half-pints and 45 minutes for pints, at the pressure for your altitude and gauge.
Do you water bath or pressure can mushrooms, whole or sliced?
Mushrooms, whole or sliced is low-acid and must be pressure canned; a water bath can't make it safe.
What PSI for canning mushrooms, whole or sliced?
With a weighted gauge, use 10 psi up to 1,000 ft and 15 psi above that. With a dial gauge, use 11 psi to 2,000 ft, 12 psi to 4,000 ft, 13 psi to 6,000 ft and 14 psi to 8,000 ft.
Gear this guide uses
Mushrooms, whole or sliced can only be made safe in a canner that actually reaches and holds pressure.
- Low-acid foods need the ~240°F only a pressure canner (Presto or All American) can reach — a water-bath canner can't.
- A weighted-gauge regulator can't drift out of calibration, which is why it jumps to 15 psi above 1,000 ft.
- Pack into tested-recipe Ball mason jars and lids and leave the headspace your recipe calls for.
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Sources
General education, not a recipe. Always follow a current USDA-tested process for your food, equipment, and elevation. Processing time per Part 4, Mushrooms, whole or sliced — hot pack, sea level.