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As you may already know crab grass preventer does not kill crab grass it kills crab grass seed and that includes grass seed too. If you lay your seed in soil that previously had crab grass then your results of seeding grass will be over run with crab grass when summer comes. This is what I suggest and it involves a little labor for best results. Scape that top layer getting up as much lose material as possible, then apply crab grass preventer, then spread about 2" of loam then seed as you normaly would. If you think you gave a big job on your hands then rent a thatcher and lower the machine so that it cultivates the soil, then remove lose material (grass, roots rocks ect.) again lay down preventer then fresh soil and seed...that also includes starter fertizer, rolling it firm & watering. I would wait till may.
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