I can vouch for the winter seeding as I watched my FIL throw what grass seed was left in a bag out in a section of his yard around Christmas as he found it in the way in the garage. Next Spring you could see the new grass and that was the greenest area in his yard.
He also recommends freezing the seed before planting it if you plant during fall or spring, his theory is that it simulates winter dormancy.
edit to add...he lives in north east corner of MD near DE/PA. The winter he did it was the one we had three blizzards and it was very cold. It survived the following summer heat as well as the rest of his lawn. I haven't really made a point to notice it since that first spring when you couldn't help but see all the thick new growth there. I can't say for sure that the crabgrass hasn't taken over there since then, but I can say for sure it isn't a bare brown spot.
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