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The 240° Myth: Botulism, Heat Resistance, and the Misunderstood Pressure-Only Mandate

Safe Canning Practices

30 Jun at 1:02 pm

Most educators emphasize that Clostridium botulinum spores require 240°F to be “killed.” But this oversimplified message creates confusion and ignores a critical scientific truth: thermal lethality is a combination of temperature and time—not just hitting a magic number.In fact, spores can be inactivated at lower temperatures, including 212°F, if sustained…

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Diane Devereaux, The Canning Diva®, has safely home canned food since 1989 and for the past 10 years she has made it her mission to teach the inner-workings of food preservation so everyone is empowered through knowledge to have a well-rounded food supply year-after-year.