Boulder, Colorado in the 1800s - Very few trees
A lot of people don’t believe it when they come to the Boulder, Colorado area, but there were very few, if any, trees in Boulder and other towns like Louisville naturally. As you can see in this image from the 1800s, there are a few trees on the left side of the image, which is west, and closer to the mountains. Louisville, Colorado is east of here.
This image comes from the City of Boulder Facebook page.