If you know where the old rail-road tracks are along the side of Hwy 24 as you drive out of C-Springs/Manitou toward Woodland Park are, the vines are all along the there.
So, as you come back down/east of 24 there are several pullouts. One of the pullouts is by a creek. If you cross the creek, there an small open spot leading up a hill to the old rail-road path (now a hiking path). GPS Coords: 38.8743,-104.930377 (according to Google.)
This is only one spot, and I found it by accident with my running club. I know there are more. If you ask the folks at some of the local breweries and homebrew supply stores, they may know more. (Rocky Mountain, Bristols, Trinity, etc)