https://time.com/5844858/first-us-coronavirus-cases/

In its latest Morbidity and Mortality Weekly Report, researchers at the U.S. Centers for Diseases Control (CDC) say that there were limited instances of COVID-19 in the U.S. during most of January, and that SARS-CoV-2, the virus that causes the disease, didn’t start to spread widely until the end of the month and into February.