Monitor soil temperatures and compare to historical averages for optimal lawn care timing.
Know exactly when to overseed, apply pre-emergent, or fertilize based on actual soil conditions in your area.
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Know the exact window for seeding, fertilizing, and weed prevention
Compare current temps to 5-year and 10-year averages
Get soil temperature specific to your ZIP code or city
Soil temperature directly affects seed germination, root growth, and nutrient uptake. For example, cool-season grass seeds germinate best when soil temperatures are between 50-65°F, while warm-season grasses need 65-75°F. Pre-emergent herbicides also work best when applied before soil reaches specific temperatures (typically 55°F for crabgrass prevention).
This tool displays soil temperature at approximately 2 inches (6cm) depth, which is the standard depth for lawn care decisions. This is where grass seed germinates and where most root activity occurs. Surface temperatures can vary dramatically with sun exposure, while 2-inch depth provides a more stable and relevant measurement.
For crabgrass prevention, apply pre-emergent when soil temperatures consistently reach 50°F but before they hit 55°F. Crabgrass germinates around 55°F, and pre-emergent needs to be in place before germination starts. Use this tool to track when your area approaches these thresholds. Most areas have a 2-3 week window for optimal application.
Cool-season grasses (Kentucky Bluegrass, Fescue, Ryegrass): Optimal soil temperature is 50-65°F. Fall seeding (late August to early October) is generally best as soil is warm but air is cooling.
Warm-season grasses (Bermuda, Zoysia, St. Augustine): Optimal soil temperature is 65-75°F. Late spring to early summer is the best time when soil has warmed sufficiently.
