Your September checklist
Apply fall pre-emergent
A fall pre-emergent prevents winter weeds like henbit and poa annua from taking over dormant turf.
Overseed shady areas with fescue
If you maintain fescue in shade, early-to-mid September is the seeding window — cool nights, warm soil.
Aerate compacted areas
Early fall aeration helps the lawn recover from summer traffic and prepares roots for winter.
Fix drainage and grading
Mild weather makes September ideal for the drainage and leveling projects you identified during spring storms.
Gradually reduce watering
As temperatures drop, the lawn needs less water. Scale back rather than stopping abruptly.
Pro tip
September is also the best month to plant trees and shrubs in Oklahoma — they root all fall and winter.