If you’re reading this article, chances are that you love getting outside and enjoying nature. You also probably know that Colorado’s four national parks are some of the best places to experience the Centennial State first hand. From the Painted Wall found in the Black Canyon of the Gunnison to the ancient ruins at Mesa Verde, it’s easy to see why many consider Colorado to be one of the most beautiful states in the country. Unfortunately, national parks can be expensive to visit, often turning off locals that could easily just go somewhere closer to home. Lucky for you, there are several days throughout 2017 when you can visit them for free. Here they are:

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January 16: Martin Luther King Jr. Day

February 20: Presidents’ Day

April 15-16 and 22-23: National Park Week

August 25: National Park Service Birthday

September 30: National Public Lands Day

November 11-12: Veterans Day Weekend

CHALLENGE: How well do you know Colorado's State Parks?

So there you have it, 10 days when you can visit Colorado’s four national parks free of charge. Enjoy!