Answer: I know the Seattle area has had some extended winter weather and some late snowstorms. I suspect the grass seeds, which would normally sprout and grow during mild winters, has not survived this year's extended winter. I'd reseed the bare spots, first by raking the soil to roughen it up and then broadcasting seeds. Cover the seeded areas with a thin layer of peat moss to help keep the seeds moist and to discourage birds from feasting on the seed. Your grass seed should sprout in 7-10 days if kept moist. In a few weeks the grass will fill in.
Best wishes with your lawn!
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