I'd recommend waiting until the first snow storm and sow just before the snow falls, otherwise they might get relocated by heavy rain (like we some times get in November) or eaten up by birds or carried off by ants.

What seeds are you trying to sow? That makes a difference in the answer. Some seeds can be scattered now and some in very early spring while snow is still happening. Some can be started now and when they come up, you put some protection over them during winter to keep them at an even temp.