Campsis radicans.

Is it actually a shrub, or could it be a vine? It looks like trumpet vine to me. It's a heavy, destructive vine in my zone, but your cold winters might help keep it under control.

I agree with the Trumpet Vine theory. All of mine looks exactly like that.

Bit too redish for campsis radicans, I think, but growth looks similar. My campsis was more orangie, with bigger flowers (till I finally got rid of it). Have you noticed if it succors, you know, sends up shoots from ground level?

Campsis radicans 'Flamenco' is bright red.

Here is a link that might be useful: Campsis radicans

Thank you all very much for your feedback!!!
I am pretty sure that it is Campis Radicans -- as it looks identical to the vine on this campis radicans photo link. My interest stems from looking for a great vine/shrub to grow up the 6 ft. cedar fence in my back yard. I hope to achieve an attractive green look most (if not all) of the year --with some nice periodic flowering as well. I noticed this Campis Radicans growing on a neighbors fence and thought it might be a good choice for me. Any thoughts on a better choice? I live in the Denver area.

Here is a link that might be useful: {{gwi:296969}}

Yeah, no doubt, thanks for that tulsarose, I'll avoid that one too.

A couple of other species are also grown, one a hybrid between the other two. Since one shown at link appears to have two-colored flowers (normal for the species), possibly it is actually not one of the red cultivars.