Given the warm temperatures it may something to consider. Crabgrass will start to germinate when soil temperatures reach about 55-60 at one-quarter inch below the soil for about a week. Soil temperatures at this point are at 55 degrees. There is also some wait and see going with preemergent control products because you could ask yourself if I don't put it down and crabgrass germinates will a potential frost kill off young crabgrass seedlings. So ots really a guessing game and you try to guess right so you might want to apply and make sure you water the product in well.