Hi Kathleen,

From what I can see in the photo, that is a funnel weaver spider (not to be confused with the Australian funnel-web spider!).  These are common Colorado spiders that are often found in homes.

This fact sheet discusses life history and biology very thoroughly:https://webdoc.agsci.colostate.edu/bspm/ArthropodsofColorado/Funnel-Weaver-Spiders.pdf

and this one provides a shorter overview, along with some control recommendations if you'd like to pursue them: https://extension.colostate.edu/topic-areas/insects/spiders-in-the-home-5-512/

I hope this is helpful!

Cordially,

John