From 5:32 to 5:49 AM, MST. Friday morning it was just starting to get bright, so may not have been visible. I'm afraid after today we have a several week wait before the viewing gets good again.
Ian commented on Comet ISON Time-Lapse 11/15/13, From Golden, Colorado
What time did you capture this? I was out a little after 5am Friday morning at Red Rocks, but Virgo was already washed out by pre-dawn light and maybe a tiny bit of haze.