Saw this thread in iSpy (so I'm under 50). As a fellow Denverite, I face the exact same weather as the OP. It's supposed to snow tomorrow, so I definitely won't ride tomorrow. It also snowed on this past Wednesday, but the ground was clear of snow on Friday. I was lazy and didn't get to ride until Sunday. It was a brisk 45º when I started, and it warmed up to 59º when I got home. I was comfortable in my legwarmers, bib shorts, long-sleeve compression shirt, and jersey.