Cover Crops

Good cover crops for this time of year are winter wheat and winter rye. You can broadcast them and leave them bare on the ground or for better results you can broadcast them and cover with wheat/oat or barley straw or lightly till them under. This time of year you’ll have the best results with covering or tilling because the frost can kill the germinating embryos.
Low growing clovers like dutch white clover and sweet yellow clover will work well too if you need the nitrogen fixing capabilities of these plants. They take a lot longer to germinate and you may not see much action from them until spring. Apply them the same way for best results.
If you can’t till or cover and you’re concerned about the frost then you can wait until you have snow cover and then “Frost Seed” the crops right on top of the snow. They will come up as soon as the weather allows them too. Clover can thrive when planted this way since the seeds need scarifying most of the time to do their best. The frost cracks the outer shell making it easier for the embryo to get started.
White clover and yellow clover are, for the most part, very short and won’t bother anything in the garden if they continue to come up and they will attract bees and pollinaters to the area as well as fix nitrogen and croud out weeds during the growing season. Some people plant these clovers as permanent crops in permaculture gardens to keep weeds out of the paths and unused areas.