Denver, CO isn't exactly a hotbed for current hardcore bands, at least none that are known on a national (or larger) scale. However, there are a few that come to mind: Civilized, Cadaver Dog, and Negative Degree. Here is the first EP from the latter, titled 'Get Fucked.' This was released on Deranged Records back in 2013. Really good midwest style HC that would have come about in the early 80's. Other than this EP the band has released a demo. I haven't heard anything about them in quite a while, so I hope they're not done.