Well, in MN, our summers are basically your winters. That said, my sprouts are about 2 inches tall and very thin... and they've looked like toothpicks for about 70 days at this point. So I don't think it is the day length for bulbing that is the issue here. Soil is def loose, very well draining (I live in sand but I've turned in plenty of compost. I still have to water often because everything just runs through the sand.)
I don't want to do seedlings. If I have to do that I'll just buy the onions. There's no point in spending the same $$ to buy a baby onion as a big onion would cost just to spend the extra time to let it grow bigger. I was really hoping there was a type of bulb onion that I could seed here in MN. The ones I have are red creole, short day ones. I'll have to try some long day ones and see if that goes better.
Thanks!