I live in Columbus Ohio, we've had a mild winter. For the past couple weeks we've been in the 50's - high 60's everyday. My lilies are sprouting now, about 1 inch as of today. Unfortunately as Ohio goes, it's getting cold again for the next 4 nights around 25 - 28 degrees. Tonight I have covered them with a light sheet until morning. I'm not sure if lilies need covered on cold nights once they start sprouting? They are about 6 weeks early.