- National Kite MonthApril
- National Frog MonthApril
- National Garden MonthApril
- Financial Literacy MonthApril
- California Earthquake Preparedness MonthApril
- National Humor MonthApril
- National Mathematics Education MonthApril
- National Poetry MonthApril
- Metric System Adopted in FranceApr 7, 1795
- World Health DayApr 7, 2013
- National D.A.R.E. DayApr 7, 2013
- Holocaust DayApr 7, 2013
- Civil War EndedApr 9, 1865
- Jumbo the Elephant Arrives in USApr 9, 1882
- 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
- National Library WeekApr 14-20, 2013
- Leonardo da Vinci’s BirthdayApr 15, 1452
- Titanic DisasterApr 15, 1912
- Paul Revere’s Midnight RideApr 18, 1775
- San Francisco EarthquakeApr 18, 1906
- Pet Owners DayApr 18, 2013
- Revolutionary War Begins with Shot Heard ‘Round the WorldApr 19, 1775