The COVID-19 pandemic has raised even greater concerns about a growing teacher shortage. In this study, we use administrative data on more than 140,000 Michigan traditional public and charter school teachers in an interrupted time series framework to understand how teacher attrition and supply may have shifted after the onset of the COVID-19 pandemic. Our results suggest that Michigan teachers were more likely to leave the profession, less likely to leave their districts, and more likely to switch schools within their district after the 2020-21 and 2021-22 school years relative to pre-pandemic trends. Additionally, teachers in low COVID-19 rate communities, as well as those in districts that offered fully in-person instruction at the start of the 2020-21 school year, were more likely to leave the teaching profession or switch districts following the 2019-20 school year compared to teachers in fully remote districts.