When to Apply Pre-Emergent in Florida
The best time to apply pre-emergent in Florida is january to mid-february. Use the GDD tracker below for precise timing based on your ZIP code.
Check Your GDD Status
Enter your ZIP code for precise Growing Degree Day data based on your nearest weather station.
Pre-Emergent Timing in Florida
Spring Application
January to mid-February
Target: when soil temperature reaches 55°F at 4-inch depth for several consecutive days
Fall Application
August to September
Prevents winter annual weeds like annual bluegrass (Poa annua)
Common Grass Types in Florida
Florida has a warm-season climate, meaning soil temperatures rise early in the year. Crabgrass and other summer annual weeds can begin germinating as early as late winter, so early pre-emergent application is critical.
Pre-Emergent Tips for Florida
- South Florida (Miami, Fort Lauderdale) should apply in early to mid-January.
- Central Florida (Orlando, Tampa) can apply from mid-January to early February.
- North Florida (Jacksonville, Tallahassee) has more time, applying in February.
- Florida's year-round growing season means a fall application is also important.
- Atrazine is commonly used on St. Augustine grass but check local regulations.
Local Expert Resources
For research-backed lawn care advice specific to Florida, visit your state's university extension service:
UF/IFAS ExtensionFrequently Asked Questions
When should I apply pre-emergent in Florida?
In Florida, the best time to apply pre-emergent is january to mid-february. Use Growing Degree Days (GDD) tracking for precise timing based on your local soil temperature.
What grass types are common in Florida?
Common grass types in Florida include St. Augustine Grass, Bermuda Grass, Zoysia Grass, Bahia Grass, Centipede Grass. Florida is in USDA Hardiness Zones 8a-11a.
What is the best pre-emergent herbicide for Florida?
For most lawns in Florida, Prodiamine (Prodiamine 65 WDG) provides the longest-lasting barrier at 8+ months. If you are applying late, Dithiopyr (Dimension 2EW) is a better choice because it offers early post-emergent control on young crabgrass. Compare all pre-emergent options.
What soil temperature triggers pre-emergent application in Florida?
Apply pre-emergent when soil temperature at 4-inch depth reaches 55°F for several consecutive days. In Florida, this typically corresponds to 150–200 Growing Degree Days (base 50°F) accumulated from January 1.
Should I apply pre-emergent in the fall in Florida?
Yes. In Florida, a fall pre-emergent application (august to september) prevents winter annual weeds like Poa annua (annual bluegrass) and henbit from establishing.
Track Your GDD
Don't guess -- use Growing Degree Days to know exactly when to apply pre-emergent herbicide at your location.
Check Your ZIP Code