1) In 1985, Idaho experienced one of its largest wildfires on July 31. The wildfire, known as the Wagon Wheel Fire, burned 33,000 acres in the McCall area, causing significant damage to homes and businesses.

2) On July 31, 1890, Idaho became the 43rd state to join the United States. President Benjamin Harrison signed the Idaho Admission Act, officially making Idaho a state.

3) In 1877, one of the most notable battles in Idaho's history occurred on July 31. The Battle of Camas Creek was fought between a U.S. Army cavalry led by Colonel Samuel D. Sturgis and Nez Perce warriors led by Chief Joseph. The battle resulted in a victory for the Nez Perce.

4) On July 31, 1937, the Union Pacific Railroad's City of San Francisco passenger train derailed near Montpelier, Idaho. The accident was caused by a boulder falling onto the tracks, killing 11 passengers and injuring dozens more.

5) Idaho's famous Potato Museum opened its doors on July 31, 1988. Located in the small town of Blackfoot, the museum highlights the history and importance of the potato industry in Idaho and around the world.