Very early, but I'm not too surprised to hear it. Yesterday I spotted the first drone of the season, and about a dozen drone cells scattered about. Early drones go with early swarms. No danger of mine swarming yet though; they winter with very small clusters, and so far there's only a small amount of brood, and maybe 10 000 bees. They'll expand very fast though, and be raising queen cells in a month or so.