1. On February 18, 1859, Oregon was admitted as the 33rd state of the United States. The state was originally part of the Oregon Territory, which was established in 1848 and included parts of what are now Washington, Idaho, Montana, and Wyoming.

2. In 1933, the Oregon Legislature passed a resolution that made February 18th "Oregon's Birthday." The day is now recognized as a state holiday and celebrated with events and activities across the state.

3. The Oregon Trail, a historic route used by pioneers traveling westward in the mid-1800s, passed through the state. February 18th marks the anniversary of the first covered wagon entering the Willamette Valley, just south of present-day Portland, in 1841.

4. The Oregon Coast Aquarium opened on February 18, 1992. The aquarium, located in Newport, is home to thousands of marine animals and has been recognized as one of the top aquariums in the United States.

5. February 18th is also notable for its weather patterns in Oregon. The state has experienced significant snowstorms on this day in the past, with some of the heaviest snowfall occurring in 1937 and 1979. However, the day has also seen record-breaking high temperatures, with the warmest February 18th on record occurring in 1909 with a high of 72 degrees Fahrenheit.