When to Apply Pre-Emergent in Oklahoma
The best time to apply pre-emergent in Oklahoma is late february to late march. Use the GDD tracker below for precise timing based on your ZIP code.
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Pre-Emergent Timing in Oklahoma
Spring Application
Late February to late March
Target: when soil temperature reaches 55°F at 4-inch depth for several consecutive days
Fall Application
Late August to mid-September
Prevents winter annual weeds like annual bluegrass (Poa annua)
Common Grass Types in Oklahoma
Oklahoma sits in the transition zone, where both warm-season and cool-season grasses can grow. This means your pre-emergent timing depends heavily on your grass type and your specific location within the state.
Pre-Emergent Tips for Oklahoma
- Southern Oklahoma should apply by late February to early March.
- Oklahoma City and central Oklahoma should target mid-March.
- Tulsa and northeastern Oklahoma can apply in mid to late March.
- Bermuda grass is the dominant lawn type across most of Oklahoma.
- OSU recommends a split application for best crabgrass control in Oklahoma.
Local Expert Resources
For research-backed lawn care advice specific to Oklahoma, visit your state's university extension service:
Oklahoma State University ExtensionFrequently Asked Questions
When should I apply pre-emergent in Oklahoma?
In Oklahoma, the best time to apply pre-emergent is late february to late march. Use Growing Degree Days (GDD) tracking for precise timing based on your local soil temperature.
What grass types are common in Oklahoma?
Common grass types in Oklahoma include Bermuda Grass, Zoysia Grass, Tall Fescue, Buffalo Grass. Oklahoma is in USDA Hardiness Zones 6b-7b.
What is the best pre-emergent herbicide for Oklahoma?
For most lawns in Oklahoma, 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 Oklahoma?
Apply pre-emergent when soil temperature at 4-inch depth reaches 55°F for several consecutive days. In Oklahoma, 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 Oklahoma?
Yes. In Oklahoma, a fall pre-emergent application (late august to mid-september) prevents winter annual weeds like Poa annua (annual bluegrass) and henbit from establishing.
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Don't guess -- use Growing Degree Days to know exactly when to apply pre-emergent herbicide at your location.
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