Teacher shortages have been worsening in California since 2015. After years of budget cuts and teacher layoffs, the passage of Proposition 30, officially titled Temporary Taxes to Fund Education, and the Local Control Funding Formula (LCFF) brought more money back into California schools after 2014. Many districts began to hire again, looking to reinstate classes and programs reduced or eliminated during the Great Recession. But qualified teachers were hard to find: The supply of new teaching candidates had declined by more than 70% over the decade when jobs were not available. As a result, since 2014-15, California districts have reported acute shortages of teachers, especially in mathematics, science, and special education. The passage of Proposition 58 reinstating bilingual education has triggered additional shortages of bilingual teachers. This report highlights the most recent data on California teacher shortages. The authors first describe overarching trends in the teacher labor market, then discuss current indicators of shortages and how they vary by subject area, location, and student population. They investigate sources of shortages in California, and finally they turn to potential state action to mitigate shortages in California. [To view the research brief, "Teacher Supply Falls Short of Demand in High-Need Fields, Locations," see ED594728.]