North Texas homeowner guide

When to apply pre-emergent in DFW

Texas A&M AgriLife recommends applying spring pre-emergent when soil temperatures reach about 55°F for several days, which is when crabgrass starts to sprout. Fall applications go down when soil cools to about 70°F. In North Texas the spring window often falls in late winter, but it shifts by several weeks from year to year, so go by soil temperature, not the calendar.

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Spring: soil near 55°F for several days
2
Fall: soil near 70°F
3
Water it in per the label
4
Don't use on new sod or seed

Written for DFW homes

Spring timing

Crabgrass is usually the first summer weed to sprout, so spring timing is based on it. Texas A&M says germination begins once soil at about 2 inches deep holds near 55°F for several days. Rockwall County Master Gardeners note this usually comes about two weeks before the area's average last freeze.

Fall timing

A fall application targets winter weeds like annual bluegrass and henbit. Texas A&M says to apply when soil temperatures drop to about 70°F for several days.

How to check soil temperature

Use a soil thermometer, or even a kitchen meat thermometer
Check a few inches down, in the morning
Ask your county AgriLife Extension office for local soil data
Follow the product label for rates and watering

Sources

FAQ

Common questions

When should I apply pre-emergent in Dallas?

When soil reaches about 55°F for several days in late winter or early spring. The date shifts each year.

Do I need a fall pre-emergent in North Texas?

It helps prevent winter weeds. Apply when soil cools to about 70°F.

Can I put pre-emergent on new sod or seed?

Generally no, since it can stop new grass from rooting. Check the label.

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