1. Columbus Day: October 12 is celebrated as Columbus Day across the United States, including Idaho. This day commemorates the arrival of Christopher Columbus in the Americas in 1492.

2. Idaho Day: In Idaho, October 12 is also celebrated as Idaho Day. This day marks the anniversary of the day when President Benjamin Harrison signed a proclamation admitting Idaho as the 43rd state of the United States in 1890.

3. Idaho State Fair: The Idaho State Fair is an annual event that takes place in Boise, Idaho. The fair begins in late August and runs through Labor Day weekend, but on October 12, 2019, the Fair launched its inaugural Oktoberfest event.

4. Discovery of gold: On October 12, 1862, a group of prospectors discovered gold in the Florence Basin area of Idaho. This led to a gold rush in the area, and the boomtown of Florence was established.

5. Targhee National Forest: On October 12, 1905, the Targhee National Forest was established in Idaho. The forest spans over 1.8 million acres, and is situated on the western side of the Teton Range. The Targhee National Forest is home to numerous hiking trails, fishing streams, and popular ski resorts.