1. Gold was discovered in Bannack, Montana on August 17, 1862, leading to the Montana Gold Rush. This event helped to bring settlers to the area and contributed to the development of the state.

2. On August 17, 1894, the first train arrived in Butte, Montana. Butte was once one of the largest copper mining towns in the world and the arrival of the train helped to connect the town to the rest of Montana and the country.

3. In 1904, the city of Great Falls, Montana was incorporated on August 17th. The city is named for the Great Falls of the Missouri River, which is located nearby.

4. August 17, 1969 saw the opening of the Montana State Prison in Deer Lodge. The prison is still in operation today and is the state's largest correctional facility.

5. On August 17, 1999, President Bill Clinton signed a bill creating the Lee Metcalf Wilderness and the Absaroka-Beartooth Wilderness in Montana. Both areas are known for their scenic beauty and are popular destinations for hikers and outdoor enthusiasts.