| Some people claim when there is snow on the ground is a great time to plant grass seed. It lays there soaking up water and when the ground warms up, it sprouts getting the full benefit of the spring rains. That would introduce good grasses.
If what you have includes course grasses such as tall fescue, you might wait a couple of months and hit it Round Up or other such product. Then is a couple of weeks, work it up and plant blue grass or something. Once it is growing, if you had crab grass last year, you might put down a pre emergent. Plan a 5 year battle to clean up crabgrass. Old seed keeps sprouting for years. | 
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