Of course, as dry as it is here in my little part of southern MN (just like last fall), if we don't get any snow or rain by May, the lumps won't matter - nothing iwll sprout anyhow.
Last fall I put some cover crops into a 2 acre patch we worked up and tiled. UI planted in September, couplew 100 seeds of rye sprouted, none of the clover or radish did. After I planted oats on part, and corn on the other part, we got heavy rains in May, and then it finally sprouted.
So, if we don't get moisture, we will have problems beyond lumpy ground. :)