If you ask the park ranger at the front gate to turn off all of the lights in the park, most nights they will. The park is almost always on the list for closure due to the few visitors it gets. During the winter they plow the parking lot for people to slide down a little hill. You can see within 5 degrees of the horizon in all directions. This is the prairie.
Most people think northern Minnesota is all trees.
This area is wide open. The land is very flat. I have stood on my porch and seen the green flash at sun down a number of times. So, no obstructions, no light pollution, and no population around. The sky up there disorients a lot of people.