Patience is your best virtue when it comes to good crabgrass prevention. You can’t fool Mother Nature and when it comes to making her garden grow. Ugly annual summer weeds love the heat. Crabgrass, goosegrass, and foxtail weed seeds will not germinate until the ground soil temperature reaches 55°. Soil temperatures will not warm until nighttime temperatures are consistently above 50°.

When Do I Apply Step 1 Prevent?

The recommended application dates for the first application of Prevent to prevent crabgrass are mid-March to mid-April. Applying Prevent too early in March can cause a lapse in coverage when it is needed the most in late May and June. Experienced homeowners and professionals can extend control for crabgrass longer into the weed growing season by having patience in applying Prevent. Waiting to apply Prevent when ground soil temperatures are nearer to 50°.

See Related: Uncle’s Idiot Proof Lawn Care Program

When Do I Apply the Step 3 Prevent?

Step 3, the second application of Prevent, goes down in late May to early June when soil temperature reach 70°. For the best results always apply ½” of water within 48 hours after application.

Why Do I Need a Second Application of Prevent?

The real secret to crabgrass control is using two applications of Prevent. Uncle’s two application Prevent formula extends crabgrass control through heavy spring rains and dry, hot summers while one step formulas simply breakdown and fade away. They didn’t need to tell Uncle, but University testing has shown that two application pre-emergent formulas outperform one application formulas under mid-western weather conditions.

How Do I Find the Ground Soil Temperature?

You can use a soil temperature probe to test the soil temperature in your own lawn or you can simply watch the weather forecasters. When day and night time temperatures above 50° for more than a week, the soil temperatures will be rising. You can follow the ground soil temperatures at the sites linked below or you can use Mother Natures sign to throw down Prevent is when the redbud blooms.


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