Mark your calendars, because you can enjoy Colorado's gorgeous national parks fee-free on these dates in 2017. 

Shelby Taylor-Thorn/TSM

While we understand the importance of what our money goes towards when we pay an entrance fee -- it's never not going to be enticing to spend the day wandering Rocky Mountain National Park without forking over a twenty at the gate.

Here are the days in 2017 that you can enjoy Rocky Mountain National Park, Black Canyon, Colorado National Monument, the Great Sand Dunes, Mesa Verde and more for free, courtesy of the National Park Service:

Saturday, April 15, Sunday, April 16

Saturday, April 22, Sunday, April 23

Friday, August 25

Saturday, September 30

Saturday, November 11, Sunday, November 12

Read more about NPS' National Park Free Days here.