I think with a lot of the hatcheries and feed stores, they start early because of Easter. A lot of people get chicks for Easter and most of the feed stores have chicks in the stores already so a lot of people just pick them up. And it’s also not that early, a lot of places are quite warm at this time of year and in April and the chicks can be outside. In warmer climates, it might still be a bit cold, but for northern climates where it has been below freezing, often well below, for most of the winter, and covered in snow, 50s, 60s, or even 40s, is extremely warm compared to that lol I don’t really know the specifics on why and I suspect it varies for people but spring is a very common time for chicks and for lots of babies in general. It is starting to warm up, snow is melting or has melted, flowers and trees start to bloom, animals return and their babies are being born, etc., so I think it just goes with the general rebirth that is going on during this time and even somewhat early like March or April, this is already happening. May is technically still spring but that late it is getting close to summer. Idk, I think people just want their chicks earlier and it’s kind of like a really positive thing to look forward to after a long, hard, cold winter. Plus I think it just is how it’s always been done I guess. A lot of breeds are sold out later in the year and feed stores usually stop carrying chicks later on too. My feed store starts next week and gets their last shipment in May 20th, with most of the chicks and the good breeds coming in April, so if you buy your chicks from the feed store, you may not have a choice but to buy them earlier.