Thanks to AGW, looks like we're in for two days of soaking rain. That's perfect timing, because I did all of my Spring fertilizing this weekend: lawn, perennial gardens, shrubs, Raspberries - and Holly-Tone for the Rhodies, azaleas, hollies, etc. (I also put down Preen on most of the flower gardens. It saves a lot of trouble to put it down before the first weed seeds germinate.)
It makes sense to fertilize before things green up, because the roots wake up hungry and begin growing many weeks before anything green emerges. Early Spring is when roots do most of their growing.
My grass should be happy this year because I plugged it last year. Big power plugger, a bitch of a machine to handle. I went over all of it twice. The plugs disappear fast.