Teton County, Wyo. mask order in effect June 1 to June 11 for public, private K-12 schools Pexels/Pixabay JACKSON, Wyo. (KIFI) – Wyoming statewide Health Order #1, which requires masks in public and private K-12 schools, is set to expire on May 31, 2021. Most schools in Teton County, Wyo. are in session through June 11, 2021, and since many students in Teton County have not had the opportunity to be fully vaccinated against COVID-19, the Teton District Health Officer has put into place Public Health Order #21-4. This public health order will require students, teachers, school staff and visitors in public and private K-12 schools to wear face coverings from June 1, 2021 through June 11, 2021.