The ideal time to apply pre-emergent herbicide, such as Prodiamine or Dithiopyr, is when soil temperatures are consistently between 55°F and 70°F. In the spring, apply pre-emergent as soon as soil temperatures reach 55°F. This is when crabgrass and other annual weeds begin to germinate. The application window closes as soil temperatures approach 70°F, so timely treatment is essential for effective weed prevention.
In the fall, the process is similar but reversed. Begin your pre-emergent application when soil temperatures drop to 70°F and complete it before they fall below 55°F. This timing targets fall-germinating weeds and helps keep your lawn healthy year-round.
For the most accurate timing, use a soil thermometer or download the free Yard Mastery app to receive real-time soil temperature updates and pre-emergent notifications tailored to your location.
Here is a video where this is discussed more in-depth:
Link to video: https://youtu.be/DlUFZD1mw3c
Want to know exactly when to apply your pre-emergent? Download the FREE Yard Mastery app today!
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