1. Idaho State University was established on March 5, 1901. The university was originally named the Academy of Idaho and was founded as a private school. Today, it is a public research university with campuses in Pocatello, Meridian, Idaho Falls, and Twin Falls.

2. Idaho's first female mayor, Phebe C. Novakovic, was elected on March 5, 1935. Novakovic was the mayor of the town of Ketchum, located in central Idaho. She served in the position for two years.

3. On March 5, 1958, the United States Army announced plans to build a nuclear reactor in eastern Idaho. The reactor, known as the National Reactor Testing Station, was built near the town of Arco and was used to test and develop nuclear technology.

4. On March 5, 1973, the United States Supreme Court issued a decision in the case of Roe v. Wade. The landmark ruling made abortion legal nationwide and had a significant impact on reproductive rights in Idaho and throughout the United States.

5. In 2012, a magnitude 4.9 earthquake struck southeastern Idaho on March 5. The earthquake was the strongest to hit the region in over a decade and led to some minor damage in the town of Challis.