The only garlic variety I have ever had showing a green top above ground before winter really sets in is my softneck, Chinese Pink. Freezing temperatures didn't hurt the green tops and when the weather warmed they just kept growing. I want to make some garlic braids. Hardnecks don't work well for that. My other varieties are Turkish Giant and Persian Star, and I also have elephant garlic which looks like garlic but really is not. Some people like it, so I grow it. I sure do wonder what is happening under all of that straw mulch. The soil temperature was down to 40 a couple of days ago. It was above 50 when I put the soil thermometer in the row about 3 weeks ago.