- National Kite MonthApril
- National Frog MonthApril
- National Garden MonthApril
- Distracted Driving Awareness MonthApril
- Financial Literacy MonthApril
- California Earthquake Preparedness MonthApril
- National Humor MonthApril
- National Mathematics Education MonthApril
- National Poetry MonthApril
- April Fools’ DayApr 1, 2023
- King George III Reacts to the Boston Tea Party by Closing the Boston PortApr 1, 1774
- Ponce de León Discovers FloridaApr 2, 1513
- CDC Recommends Wearing Face Masks to Slow Spread of CoronavirusApr 2, 2020
- Hans Christian Andersen’s BirthdayApr 2, 1805
- Frederic Auguste Bartholdi’s BirthdayApr 2, 1834
- Death of Pope John Paul IIApr 2, 2005
- Booker T. Washington’s BirthdayApr 5, 1856
- PassoverApr 5 - Apr 13, 2023
- Metric System Adopted in FranceApr 7, 1795
- World Health DayApr 7, 2023
- National D.A.R.E. DayApr 7, 2023
- Civil War EndedApr 9, 1865
- Jumbo the Elephant Arrives in USApr 9, 1882
- EasterApr 9, 2023
- Safety Pin PatentedApr 10, 1848
- Spain Cedes Gibraltar to Great BritainApr 11, 1713
- Civil War Begins with Confederate Attack on Fort SumterApr 12, 1861
- Jonas Salk’s Polio Vaccine Declared Safe and EffectiveApr 12, 1955
- First Space Shuttle LaunchApr 12, 1981
- Thomas Jefferson’s BirthdayApr 13, 1743
- Alfred Butts’ (Inventor of Scrabble) BirthdayApr 13, 1899
- Leonardo da Vinci’s BirthdayApr 15, 1452
- Assassination of Abraham LincolnApr 15, 1865
- Titanic DisasterApr 15, 1912
- National Volunteer WeekApril 16-22, 2023
- Paul Revere’s Midnight RideApr 18, 1775
- San Francisco EarthquakeApr 18, 1906
- Pet Owners DayApr 18, 2023
- Holocaust Memorial Day (Yom HaShoah)Apr 18, 2023
- Revolutionary War Begins with Shot Heard ‘Round the WorldApr 19, 1775
- John Muir’s BirthdayApr 21, 1838
- Lyrids Meteor ShowerApr 21-22, 2023
- Earth DayApr 22, 2023
- Ecology Games for Earth DayApr 22, 2023
- Endangered Species for Earth DayApr 22, 2023
- National Park WeekApr 22-30, 2023
- National Library WeekApril 23-29, 2023
- Shakespeare’s BirthdayApr 23, 1564
- International Astronomy DayApr 23, 2023
- Hubble Space Telescope Launched by Space Shuttle DiscoveryApr 24, 1990
- National Playground Safety WeekApr 24 - 30, 2023
- Italy Liberation DayApr 25, 1945
- World Penguin DayApr 25, 2023
- Whydah Pirate Ship Sank Off the New England CoastApr 26, 1717
- Richter Scale DayApr 26, 2023
- Ulysses S. Grant’s BirthdayApr 27, 1822
- National Geographic BeeApril 27-30, 2023
- Harper Lee’s BirthdayApr 28, 1926
- Arbor DayApr 29, 2023
- U.S. Buys Louisiana Territory from FranceApr 30, 1803
- National Hurricane Preparedness WeekApr 30 - May 6, 2023
- Vietnam Liberation DayApr 30, 1975
