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)
Happy Hunting!
Kirk