I've been to all 63 major US national parks. These are the 6 I always tell people to visit in the fall.

In my opinion, Rocky Mountain National Park is one of the best parks to visit in the fall.

Emily Hart After visiting all 63 major US national parks , I think some are best experienced in the fall.

In many of the parks, the fall months bring fewer crowds and cooler weather.

In my opinion, the fall is the best time to visit parks like Acadia and Cuyahoga Valley.

Summer is winding down, but that doesn't mean national park adventures have to end.

In fact, many of the 63 major US national parks are at their best during the shoulder seasons.

After visiting every single park solo, I'm often asked which ones are best to visit in autumn.

Whether you're chasing vibrant foliage or simply cooler, less-crowded days, these six national parks truly shine this time of year.

Acadia National Park offers stunning fall foliage.

Emily Hart Acadia National Park in Maine is famous for its vibrant fall colors, with bright maple and oak trees scattered across its gorgeous, rugged coastline and forested hiking trails.

Although the park can definitely get crowded this time of year — especially at spots like the Cadillac Mountain summit (where you'll need a timed-entry reservation) and Jordan Pond — I think the views are worth it.

Even a short hike or drive through the park offers a classic New England autumnal experience, and a visit is definitely something I'd recommend putting on your travel bucket list.

Cuyahoga Valley National Park is the perfect fall escape.

VIKVAD/Shutterstock In my opinion, Ohio's Cuyahoga Valley National Park is a hidden gem for fall colors.