1. Montana became a state on September 16, 1889, when President Benjamin Harrison signed a proclamation admitting it as the 41st state of the United States. This day is celebrated as Montana Statehood Day.

2. On September 16, 1920, the deadliest forest fire in Montana's history erupted near the town of Cloquet. The fire claimed over 450 lives and destroyed more than 25 towns and villages. This event became known as the "Great Fire of 1910".

3. In 1989, on September 16, three mountaineers completed their climb to the summit of Granite Peak, the highest peak in Montana. This achievement is considered a significant accomplishment in the mountaineering community.

4. On September 16, 2014, Montana State University's campus in Bozeman set a new world record for the largest game of catch. The event involved 972 participants and lasted for 30 minutes, smashing the previous record of 508 people.

5. The Montana State Fair, which is held annually in Great Falls, is traditionally scheduled to start on the first Friday after September 16th. The fair is a celebration of Montana's agricultural heritage and offers visitors a chance to experience a wide array of livestock, entertainment, and culinary delights.