Well you shouldn't be; at least not just yet. Just because you can buy crabgrass preventer in the store right now, does not mean it is time to use it yet. Crabgrass actually arrives much later than most people think. Crabgrass seeds will not germinate until the soil temperature is greater than 55-60 degrees for 7 consecutive days. We won't even have air temperatures in that range for a while and even when we do, the soil temperatures take much longer to get into that range. So wait on crabgrass preventer until late April or the first part of May.