1. In 1963, the highest recorded tornado in Idaho's history touched down in the town of Blackfoot on May 13. The tornado was rated an F4 on the Fujita scale, with winds estimated up to 260 mph. It caused significant damage, but fortunately, no fatalities were reported.

2. On May 13, 1996, the Idaho Supreme Court upheld the state's ban on same-sex marriage. The ruling was challenged in later years, and the ban was ultimately deemed unconstitutional in 2014, allowing same-sex couples to legally marry in Idaho.

3. In 1877, Chief Joseph of the Nez Perce tribe began his famous retreat from U.S. forces on May 13. He and his band of followers attempted to flee to Canada to avoid being forced onto a reservation. The conflict lasted for several months and covered over 1,000 miles, ending in the Battle of the Bear Paw Mountains in Montana.

4. On May 13, 1915, the Idaho State Capitol Building was completed in Boise. The neoclassical-style building took over five years to construct and features a distinctive copper dome. It remains the state's seat of government and a popular tourist attraction.

5. The Idaho State Historical Society was established on May 13, 1907. The society is charged with preserving and promoting the state's history, including managing several museums and historic sites throughout Idaho. Their collections include over 250,000 artifacts, photos, and documents that tell the story of Idaho's past.