Get going EARLY
Just ride real early. In my experience if you get there before it starts melting all is well. We used to ride starting at 8, when it will be about 20 deg, and you're fine coming back down when it is still not much warmer than 30.
With that said, we did only start melting out today. The foothills look less white than yards in Longmont, probably due to more sun exposure and warmer tread (red dirt). I would imagine the loop probably has quite a bit of snow; the rock garden dries out faster; the backside trail is probably icy.
I was contemplating it as well, but I think a road ride would be a smarter choice, though not near as fun.