Let me buck everyone else’s suggestions, winter rye will germinate in temps into the mid 20’s, and with winters being warmer and warmer lately, if there isn’t any snow on the ground, and the seed can get to the soil now, I wouldn’t be surprised if you got growth out of it this year yet, and that would give some head start to next spring.
But in saying that, you more then likely won’t get much growth this year, if it does germinate, so giving it minimal advantage, if it does germinate, and chances are less then half will germinate if we get a mild fall, early winter. But if we get a mild fall, winter, and an early spring, the deer would certainly enjoy the early fresh green up from the winter rye if you planted now.
In my opinion , if you don’t have snow, put it down, what are you out? $30 for seed for an acre? If you have snow, then keep it for next year.
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