Hi Guys. This is my first year planting onions. I started them from seeds in January. I got excited last weekend and planted them outside. They all had about 3 or 4 little leaves on them. Anyways, the forecast looked great for the 10 days after I planted them but now the forecasters calling for another storm and overnight temps of 25-28 degree's. Will the onions be ok or will this kill them off? I'd rather not kill a few months worth of work if I can avoid it

Next year I'll move my planting date up another week or 2 just to be safer. I figured it would be fine because I'm seeing onion grass growing all over the yard. I thought onion grass and onions are probably similar enough. I'm in Zone 6b-7a near Philadelphia.