I'm wondering when the muley rut typically starts in CO? Thanks.

I think the end of October into mid November.

Cool, thanks. I'll be out the 20-28th and am gonna bring the rattlebag and maybe some doe stink.

Typically it doesn't really get rolling until about the 2nd week of November. It just so happens that's right after the last general season ends. Unlike the midwest deer seasons, CO doesn't time it so you can rifle hunt during the rut for the mule deer.