I live just north of Charleston, SC. I usually see them in late March-early April. I fill my feeders early so that I know that they have arrived.
They are fun to watch around the feeders. They use their beaks as fencing swords if they don’t feel like sharing the nectar from a particular feeder. They will feed and then fly to a high branch in a tree, wait for another one to come along then fly down and defend the feeder. A window feeder is essential.
Sometimes we have so many it looks like a swarm of bees- at lease 50+ at a time. I have three feeders and make my own hummingbird foodt - 4 parts of water to one part of sugar, bring to a boil for a couple of minutes and let cool. I go through about 5 lbs of sugar a week in late spring and taper down starting in September through the middle of October.