This year the hummingbirds were back early - on March 14th - this year. I generally use Saint Patrick's Day as a "normal" return date. The population that has returned is very vigorous too - we have as many here now as we usually have by the end of April or mid May. We have 5 quart sized feeders out and they get drained at least every other day - and at times some need re-filling every day! We'll add another two at some point.