How many years of college to be a state trooper?

There's no single answer to how many years of college are required to be a state trooper. Requirements vary significantly by state. Some states may only require a high school diploma or GED, while others may require an associate's degree or even a bachelor's degree. Many states prefer or require some college coursework, even if it doesn't specify a degree. It's best to check the specific requirements of the state police agency you're interested in.