Why then
Dethatch warm-season lawns in late spring through early summer, once fully green and growing hard. Zoysia and Bermuda are the heavy thatch producers; St. Augustine is better verticut lightly or topdressed. Never dethatch near dormancy in either direction — the lawn can’t rebuild before stress arrives.
Frequently asked questions
When should I dethatch my lawn in Texas?
Across Texas's featured cities the window runs Mar 2 – May 19. Your own town can sit at either end of that range — use the city table on this page or the ZIP lookup for your exact dates.
Why do the dates vary within Texas?
Because climate does. The dates here are calculated separately for each city from its own NOAA 1991–2020 frost records, and elevation, latitude, and terrain spread them across Texas — the same task can be a week or two apart between towns. That local spread is exactly what generic national advice misses.
What if I miss the window?
You get a second-choice window on the opposite shoulder of the season (spring for cool-season lawns, later summer for warm-season) — results are usually a step down, but far better than working in the wrong season entirely.