1. The Great Idaho Fire: On October 27, 1910, a massive wildfire began in North Idaho, which would become known as The Great Idaho Fire. It burned over three million acres of land and claimed the lives of 87 people in Idaho and Montana.

2. The Birth of the Idaho State Capitol: The cornerstone for the Idaho State Capitol building was laid on October 27, 1905. The building, located in Boise, was completed in 1920 and is still the seat of Idaho's government.

3. Record Snowfall in Ketchum: On October 27, 1985, Ketchum, Idaho received 27 inches of snow in a single day. This was a record snowfall for the town and caused significant damage to trees and power lines.

4. Idaho's Oldest Continuously Operating Theater Opens: The Egyptian Theater in Boise, Idaho opened on October 27, 1927. It is Idaho's oldest continuously operating theater and is now a venue for concerts, movies, and other events.

5. Coeur d'Alene Mines Corporation Goes Public: On October 27, 1986, the Coeur d'Alene Mines Corporation went public, marking the first time a mining company had gone public in over a decade. The company, which is headquartered in Coeur d'Alene, Idaho, is now one of the largest producers of silver and gold in the world.