Look at it this way:
You need to keep them totally sheltered and with a heat lamp 24/7 for at least 3 weeks.
Then they need to be sheltered and at room temp and have a lamp available at night for the next 3.
Then they need to be kept at about room temp at night but should be able to go in an insulated coop.
Regardless... they do not lay for a good 20 weeks or so.
So...
Even if you get them now... there are no eggs until June-ish.
Since you need to probably keep them in at least the basement or garage for 6 weeks or so... may as well start now. At least you will not have to worry about frozen water this year!
I, myself, am eagerly awaiting Feb 1st so I can order! I do wish to start earlier... but the breeds I want in 15 chick requirements (I do not want 25 just yet!) are not on sale until then. And then I gotta wait for them to be shipped!