Come experience the national parks! All National Park Service sites that charge an entrance fee will offer free admission to everyone (other fees, including timed entry or reservation fees, may apply). Mark your calendar for these entrance fee-free dates:

• February 16: Presidents Day (Washington's Birthday)
• May 25: Memorial Day
• June 14: Flag Day/President Trump's birthday
• July 3–5: Independence Day weekend
• August 25: 110th Birthday of the National Park Service
• September 17: Constitution Day
• October 27: Theodore Roosevelt's birthday
• November 11: Veterans Day

Beginning in 2026, free entrance on these days will be for US citizens and residents only. Nonresidents will pay the regular entrance fee and any applicable nonresident fees.

https://www.nps.gov/planyourvisit/passes.htm

List of Colorado National Parks and Monuments