If you did start now it would be okay. Many start in the fall. Chickens are good outside after 5 weeks of age (or whenever they get their first “adult feathers”) they’re able to regulate their body temps just fine.
But starting in the spring is great too! Lots of people start in the fall because then the chickens are ready and old enough to lay in the springtime. :)
Many just start in the spring cause that’s usually when the farm stores have a big influx of baby chicks! Hehe either way is a good way. :)