I think it is a Carolina Wolf Spider
I found it outside my front door; it was a cool temperature outside; while it was outside I took a picture, and it looked like a light grey wolf spider, about the size of a small adult hand. My husband took another picture (included here) once it came into our house; the colors look darker in this picture. I Googled light grey Colorado spiders and came across this website. Through it I guess now it is a Carolina Wolf Spider.