One of the benefits of being an FLRC member is that you can run in Barton Hall even if you’re not a member of the Cornell community. However, you do still need to find a time when the building and especially the track isn’t otherwise in use. To figure that out, consult the Barton Hall calendar. I recommend bookmarking the link for future reference.
The calendar is a good starting point, but it’s possible that a group or class could be using the track without appearing on the schedule. I know it’s frustrating, but if you get to Barton at what is supposed to be a free time and the track is clearly in use, please run outside instead. We don’t want to abuse our welcome on the track—Cornell is extremely unusual in allowing outsiders to use Barton like this. The university is good about plowing and salting walkways on campus, so it’s generally safe to run around the quads even when the roads might be unpleasant.