Lawn care backed by
university science.

Soil temperature — not the calendar — determines when to apply pre-emergent. This zone-by-zone guide gives you the exact soil temp thresholds and timing windows sourced from university extension research across zones 4–9.

Every key lawn care timing decision — seeding, pre-emergent, fertilizing, aeration — is driven by soil temperature, not air temperature. This hub guide explains the thresholds that matter and how to track them for your yard.