You may be okay. Mine are sprouting early too. If you need seed, I have lots!

I checked today and the sprouts are getting bigger about 2-3". I have them in a milk container and pretty soon they will grow where the milk container is not big enough. Too early to plant into ground?

I'm in zone 8 and we could get frosts up through the middle of May. It's our quirky pacific northwest weather. I won't put mine out til then. This is only the second time I've winter sown them, but they were fine in their milk cartons last year. I don't think I'd plant them out till after danger of frosts are gone though. I think they are a tender annual.

I've always had MG volunteers in my garden so I wouldn't worry too much. My WS MGs are doing well too.

I'd go ahead and put them in the garden if you have some mulch. We got low temps last night, and I probably could have left everything alone, but I'm new and anxious! It's the frost, not the cold that does damage. Put them in the ground and if you are in danger of a frost later pile mulch on them for the night. That's what I did to my young shoots last night. Since it's a climbing vine, just twine/twist it up into a little mound and put mulch over that. A little mulch that covers the whole plant will protect it from damage. Then you just brush the mulch away.

We'll probably all learn that we can leave things alone, just like these experienced people do, but right now I sleep better if I have them a little protected! They all seem so delicate that I'm sure I underestimate Mother Nature's tenacity all the time.