1. Lewis and Clark Expedition
On October 4, 1805, the Lewis and Clark Expedition traveled through present-day Idaho along the Clearwater River. They encountered the Nez Perce tribe and recorded their observations in their journals.

2. Idaho Statehood
Idaho became the 43rd state in the United States on October 4, 1890. This event marked the end of Idaho's territorial status and established a state government.

3. Wolf Reintroduction
On October 4, 1995, gray wolves were reintroduced into central Idaho as part of a program to restore the species to its historical range. Today, the wolf population in Idaho is thriving, and the state supports hunting seasons for wolves.

4. Idaho Potato Museum
The Idaho Potato Museum opened its doors in Blackfoot, Idaho, on October 4, 1988. The museum celebrates the history, culture, and industry of the famous Idaho potato.

5. Sawtooth National Recreation Area
On October 4, 1972, the Sawtooth National Recreation Area was established in Idaho as part of the National Forest System. This protected area encompasses over 750,000 acres of natural beauty, including mountain ranges, forests, and alpine lakes.