From Texas Standard:
Just in time for the start of school, The New York Times reports that there’s a shortage of teachers. Across the country, school districts have gone from refusing to renew contracts to scrambling to hire teachers. This shortage is seen particularly in math, science and special education, and it's a result of the layoffs from the recession years, as well as an improving economy in which fewer people are training to be teachers.
The issue is so critical that some systems are allowing new hires to train on the job and bringing in people who are still finishing their teaching credentials. According to the Times, the situation is most critical in Louisville, Nashville, Oklahoma City and Providence. However, Texas also fares low.