I leave honey with the bees, so they always have their own supply, no need to feed. Even when I make splits I split their honey reserves too.
Yeah, but sometimes that's not always possible, as in the case of my bees being robbed out. If it looks like your hives won't have enough of their own stores to last them the winter, then now would be good to start. It's starting to get chilly out. My bees don't feed a whole lot at night (probably because of the temps). They do well during the day though.