Nah...it is waste. Been doing it for a long time. When I was in college we used to say....why ?? Why not save $ and use it later.Or start early to have a healthy and beautiful lawn when spring starts. Then mow correctly.
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You can add soil or topdress it to add nutrients to the existing lawn. Loosening the soil with a rake works as well but really you are looking for good seed to soil contact as well as good moisture for germination. The fall is your best time to reseed due to the cool nights with dew on the grass and warm days. In spring time, it can be done but once soil temperatures reach the mid 50s, you run the risk of crabgrass germination in your newly established seedbed as well as the rest of the lawn. A preventative will eliminate crabgrass growth but also hinder your grass seed germination so it's kinda a toss up in the spring.When you folks say you reseed your grass don't you have to cover with soil to about 1/4 inch? That's another project in itself.