You should be fine at any time. I usually go from starter cups to the 3-4" square pots from there, and then to their final container / in ground. If the temps are such that they will be in their final homes, go for it. If you will have to move them in and out due to cool temps, then it's just more work to move bigger containers. Really, it's your call, either way is fine. Just don't overwater. If the mix in the bottom of the pot stays too wet, the roots will not be happy and won't populate the "swamp" in the bottom (depending on the mix you use).

Here is a visual. But I have transplanted as early as cots with just a hint of true leaves. As long as you are careful should be fine. I planted into solo cups and hope not to transplant again before their final home. As tsheets stated up to you but moving big pots/bags gets old quick rather than a tray of solo cups/pots. Either way up to you. I've done both and prefer not to have in bigger pots until their final home.

Mark

This post was edited by habjolokia on Sat, Mar 30, 13 at 12:01

Well I'm glad you guys were on board with me, but the mania took control of me before I even heard back from you lol !!! I just took one plant from each type that were ready (to me) and used up some of these grow bags that I've been itching to use !!!

@habajolokia A couple of them had similar rootage to that which you display above. Some less so. I attribute the lesser root systems to improper use of seed starter mix. I don't think I will use it next year.