The National Park Service turns 100 years old in 2016 and to celebrate, rangers will throw open the doors 16 times throughout the year.

Colorado’s national parklands include amazingly diverse environments, from glaciers to grasslands to sandstone cliffs to sand dunes.

Mark your calendar for these entrance fee–free dates in 2016:

Jan. 18: Martin Luther King Jr. Day
April 16-24: National Park Week
Aug. 25-28: National Park Service Birthday
Sept. 24: National Public Lands Day
Nov. 11: Veterans Day

There are 409 national parks across the country; 127 of the parks normally charge an entrance fee. Entry to the others is always free.

Note: The fee waiver includes entrance fees, commercial tour fees and transportation entrance fees. Other fees such as reservations, camping, tours, concessions and fees collected by third parties are not included unless stated otherwise.

In addition, any fourth-grader can get a free annual national parks pass through the Every Kid in a Park program, and active duty military and citizens with a permanent disability can also get free passes.

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