Answer: Rick and Deb,
First of all you shouldn't have crabgrass already this early. I suspect you are seeing another grass. That said, assuming it is crabgrass I'm inclined to say wait if you feel there is still plenty of living sod among the crabgrass plants. Crabgrass is a warm season annual. It could be mowed regularly and tolerated this season. Then next year in early spring you could put out a preemergence herbicide to prevent it from returning.
I suggest you take some samples of the "crabgrass" to your County Extension Office to see if they can identify and then prescribe an appropriate course of action.
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