Best time of year for a beekeeper is Spring. The bees have survived the worst that Winter had to offer and are beginning to thrive. The bees are focused on foraging and building up the brood. The bees will not even notice us hanging out at the entrance and may not even notice a quick inspection.
When Spring returns, get back in those hives and do an inspection. It may have been at least a month since you last gave them a good look. Do not be afraid to get reacquainted with your bees.