1. The first day of summer: June 21 marks the summer solstice, which is the longest day of the year and the official start of summer.

2. Father's Day: In 1972, President Richard Nixon signed a proclamation making Father's Day a national holiday to be celebrated on the third Sunday in June, which typically falls within a few days of June 21.

3. Oregon's statehood: On June 21, 1859, President James Buchanan signed a bill admitting Oregon to the Union as the 33rd state.

4. World War II ship launches: During World War II, June 21 was a busy day for ship launches in Oregon. In 1941, the USS Cascade was launched from the Kaiser shipyards in Portland. In 1945, the USS LSM-315 was launched from the Albina shipyards in Portland.

5. Mt. Hood climbing tragedy: On June 21, 1986, a climbing party of 13 people were caught in a sudden blizzard on Mt. Hood. Seven climbers died before rescue teams could reach them, making it one of the deadliest mountaineering accidents in Oregon history.