Sorry I was late with this reminder this year. I have had a couple of emergencies come up.
So if you haven't put your hummingbird feeders out already, you need to do it NOW.
I have had mine out for about 3 weeks now and have already seen a couple of birds drinking from it early in the morning. Also it is a good idea to replace your feeders after a couple of years as the plastic and metal on the feeders will start to deteriorate and could contaminate the nectar in the feeder. So if you notice the volume of birds to your feeder shrinking lately, that may be the reason. Try getting a new feeder and that should solve the problem and get your feeder busy again.