The first case of COVID-19 infection in the state of California was confirmed by the CDC on 26 January 2020 (NBC Bay Area, CDC). As of 20 February 2020, there were eight qualifying cases in California (NBC News, Washington Post). The outcome will be determined using open source data and inclusive of cases reported before this question's launch. Instances of cases in individuals brought from outside the state to be held in quarantine in California would not count.

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The question closed "Between 1 March 2020 and 31 March 2020" with a closing date of 4 March 2020 (CDPH).

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