March 11, 2020: First reported case is a woman in Sheridan County who recently travelled domestically.[2][3] March 13, 2020: Second reported case is a man in Fremont County.[4] March 15, 2020: Governor Gordon recommends closing all public schools.[5] March 18, 2020: Third positive case in Cheyenne, Wyoming, brings the state count up to 16 confirmed cases.[6]