April-1

April Fool's Day

April-6

National Tartan Day

April-8

ASPCA Day

April-10

National Sibling Day

April-13

Thomas Jefferson's Birthday

April-15

Income Tax Day

April-15

Rubber Eraser Day

April-16

Emancipation Day (DC)

April-16

Librarian Day (School)

April-18

Paul Revere Day

April 19-27

Passover

April-21

Easter

April-21

John Muir Day

April-21

San Jacinto Day (Texas)

April-22

Earth Day

April-22

Oklahoma Day