Question
Living in central/western PA, I plan to apply weed & feed around the end of May, in order to continue building the root system. I already applied a weed & feed w/ crabgrass preventer at end of March, but am concerned about persistent dry conditions that are likely toward the end of May and beginning in June. Woulsd itbeunwise to apply this product as summer approaches?

Answer
I am not sure about the weather conditions where you live so I cannot say; but here are a few guidelines.
Check on the label of the product that you have already applied and see if you can apply it (the weed killer part) again and how much time should elapse.
Do the same for the product that you want to apply and be sure it is O.K. to do so.
Moreover, you are thinking of making two applications of high level fertilizer within 8 weeks of apart, at a time when rain has not been falling and is not expected. I would not do it.