The spinach/lettuce transplants can wait until early Sept. if you can keep them around that long.

Pretty much everything else can been seeded now or over the next couple weeks.

Spring onions generally do better than fall onions around here, btw. Your garlic you can wait until October to set out for May+ harvest.

Fall peas also generally don't do as well as spring peas, but I rarely have a problem getting a decent-enough crop a little more North in mid-NC.

I usually start now planting spinach and lettuce seeds and make sucessive plantings every 2 wks. It's always a guessing game (I'm in Salisbury), but if it gets too hot and they turn bitter, I just go buy some transplants to fill in. :)