What kind of seed is it? It takes 3 or 4 weeks for kentucky blue grass to germinate in the best conditions.

I think it was probably a bit too cool to expect the seeds to germinate now. They might, but it'll probably taked more than 12 days. Also, the soil needs to stay damp pretty much all the time until they germinate. I'm afraid that if they do germinate now, they won't get enough growth before you get too cold for the grass.

Your best results will probably be if the grass doesn't germinate now, and instead you get what is known as dormant seeding, where the seed is on the ground dormant until it starts to warm up in the spring.

Since the ground is wet from melted snow and spring rains, you don't need to do anything to keep it damp. Also, the snows and the freeze/thaw cycles should help with seed to soil contact. I would watch for germination in the spring. Also, make sure you don't apply any preemergents next spring. Also, don't apply any broadlef weed killers until you've mowed the new grass at least three times (I think that's the rule).

Last spring i scattered seed on top of the snow in march. When the snow melted it carried the seed into cracks in the soil. The results were great. Since i have a lawn of sorts i am over-seeding with rtf grass seed. This year i am going to do the same thing again and hope it works.