wow, that’s a lot of seedlings…I’ve started a few pink ladies from seed, you can see my thread here. We’re in vastly different climates so I couldn’t really tell you when to put yours outside, as mine have been out side since they sprouted. I’d imagine you’re far enough into spring that they should be ok…as far as how they’ll grow, you’ll find variability even among the same seeds, I’ve got one that is growing much faster than the other two.The other thing to keep in mind is that these are going to be standard size trees unless you plan to graft them to other rootstock.
do you have any plans for them? looking to start your own orchard?