1. North Dakota became a state on October 31, 1889. President Benjamin Harrison signed the statehood proclamation, making North Dakota the 39th state in the United States.

2. On October 31, 1916, the deadliest train accident in North Dakota history occurred near Munich. A westbound train collided with an eastbound train, killing up to 30 people and injuring over 50 others.

3. Theodore Roosevelt visited North Dakota on October 31, 1918, for the dedication of the Northern Pacific Railroad bridge over the Missouri River at Bismarck. The bridge remains in use today as part of the BNSF Railway.

4. The town of Dickinson experienced record-breaking snowfall on Halloween 1991. Over 20 inches of snow fell in 24 hours, creating dangerous driving conditions and causing power outages.

5. In October 2019, the United States Air Force conducted a test of the Minuteman III intercontinental ballistic missile at the Minot Air Force Base in North Dakota. The missile traveled over 4,000 miles before landing in the Pacific Ocean off the coast of Guam.