Did you ever wonder whether or not grass stays green and grows under snow? Axe suggested that it remains green until spring. I suspect he is correct. For cool-season grasses: Perhaps grass stays green and turns brown only in spring when it is exposed to wind when the soil is still frozen. And then it takes about 4 weeks to greenup again, which is normally about April 15, although snow melts about March 10th, around here. If you are still reading... Certain areas of my lawn have gone slightly yellow--perhaps more ryegrass in those areas. Low-quality grass of neighbor's lawns is a bit more brownish. This photo is from the first week of December, in Michigan. Two inches of snow fell a few days ago. And then I uncovered it for the photo. Grass remained green. And then snow melted; most grass is green on December 20; this is very unusual to have no snow at this date here. I plan to uncover the area every few weeks this winter. My wife shovels the drive--I shovel the grass--makes perfect sense to me.