1. On December 25, 1866, Fort Caspar was attacked by Lakota Sioux forces in what is now Casper, Wyoming. The attack resulted in the deaths of three soldiers and one civilian, and is considered one of the deadliest conflicts between Native Americans and the U.S. military in Wyoming.

2. The first recorded Christmas celebration in Wyoming was on December 25, 1837, when fur traders and trappers gathered at a trading post near present-day Laramie. The celebration included a feast and games.

3. On December 25, 1917, a severe blizzard struck Wyoming, causing widespread damage and several deaths. The blizzard lasted for several days and is considered one of the worst in Wyoming's history.

4. In 1943, the U.S. Army opened the Heart Mountain Relocation Center in Wyoming on December 25. The camp housed over 10,000 Japanese Americans who were forced to relocate during World War II.

5. On December 25, 2007, Yellowstone National Park experienced an earthquake with a magnitude of 3.7. The earthquake occurred near the Norris Geyser Basin and did not cause any significant damage.