1. On October 25, 1957, the first nuclear reactor in Idaho was dedicated in Arco. It was part of the National Reactor Testing Station and was used for research purposes.
2. On October 25, 1887, the town of Caldwell was incorporated in southwest Idaho. It was named after Alexander Caldwell, a former U.S. Senator and landowner in the area.
3. On October 25, 1918, the Spanish flu pandemic arrived in Idaho when cases were reported in Boise. The flu would go on to infect thousands of Idahoans and cause hundreds of deaths.
4. On October 25, 1971, the Sawtooth National Recreation Area was established in central Idaho. It covers over 750,000 acres and is known for its scenic beauty and outdoor recreational opportunities.
5. On October 25, 2006, the Spirit of Boise Balloon Classic held its first ever night glow event. The annual event features dozens of hot air balloons taking to the skies over Boise and has become a beloved tradition in the area.