When To Apply Pre-Emergent – Soil Temperature

Q: In the past, I have followed the March 1st and September 15th rules for applying pre-emergent to my lawn. This year I decided to use the soil temperature from georgiaweather.net as my guide. But even in late September it still registers above 70 degrees Am I doing something wrong? 

A: You are doing it right! Soil temperature at the 2″ depth is the gold standard for determining when to put out pre-emergent. To be sure you are doing it at the right time, the soil temperature should be 70 degrees and gradually falling. That is the case in Dunwoody so bring out your spreader and have at it!