Answer: Most lawns in western Washington are composed of cool season grasses. These naturally go dormant when temperatures rise in the summer, but green up again when temperatures cool. I think the application of weed and feed is coincidental. You can continue watering your lawn on a regular basis and wait for it to green up this fall, or you can rake and remove the debris and overseed the dead spots. Grass seeds typically germinate in 7-10 days when kept moist.
Best wishes with your lawn!
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