The Master Reference
Soil Temperature Milestones
Every action in your lawn care year is triggered by a soil temperature milestone. This chart shows you exactly what to do and when. All temps are soil temperature at 3–4” depth, not air temperature.
Pre-Emergent
Fert Zone
Bio-Stim
Seeding / Fall
Winterizer
Rising Temps (Spring → Summer)
Soil warming up from winter
Falling Temps (Summer → Winter)
Soil cooling down toward dormancy
55°F
65°F
70°F
80°F
70°F
65°F
55°F
40s°F
Quick Reference
| Soil Temp | Direction | Action |
|---|---|---|
| 55°F | Rising | Pre-Emergent Zone |
| 65°F | Rising | Pre-Emergent Zone |
| 70°F | Rising | Fert Zone Begins |
| 80°F | Rising | Bio-Stim Zone |
| 70°F | Falling | Seeding Window Opens |
| 65°F | Falling | Growth Push |
| 55°F | Falling | Seeding Window Closes |
| 40s°F | Falling | Winterizer & Hibernation |