1. Earth Month: Entire Month of April
  2. National Environmental Education Week: Monday, April 19th to Friday, April 23rd
  3. National Park Week: Saturday, April 17th to  Sunday, April 25th 
  4. Earth Day: Thursday, April 22nd
  5. World Health Day: April 8th
  6. Arches National Park 92nd Anniversary: April 12th
  7. Hot Springs National Park 100th Anniversary: April 20th
  8. Channel Islands National Park 83rd Anniversary: April 26th
  9. Theodore Roosevelt National Park 74th Anniversary: April 28th