Delaware soil temperature
Estimated 2–4 inch soil temperature, statewide average . Based on NOAA weather stations near representative Delaware locations.
Data details
What this soil temperature means for your Delaware lawn
The current Delaware reading loads from today's R2 snapshot. Use the live value above or enter your ZIP code for a location-specific recommendation.
Delaware soil is still cold. Grass seed will not germinate reliably below 50°F, and most lawn chemicals are on hold. The main job now is planning: spring pre-emergent goes down as soil approaches 55°F — in Delaware, typically late march to mid-april.
Track your exact ZIP above, and see when to apply pre-emergent in Delaware for the full spring playbook.
Delaware soil is in the 50–65°F action band — the range where the big timing decisions happen. Crabgrass germinates as soil holds 55°F and above, so spring pre-emergent is either due or already late. It is also the germination range for cool-season grass seed and the recovery range for core aeration.
Check pre-emergent timing for Delaware, or the state pages for overseeding and aeration to act on this window.
Delaware soil is warm (65–80°F). Spring pre-emergent windows have passed, and it is too warm to start cool-season seed. This is peak season for warm-season growth — and for soil-driven pest timing: grub eggs hatch in warm midsummer soil.
Check grub control timing for Delaware, and plan ahead for fall: overseeding and aeration open up as soil cools back through 72°F.
Delaware soil is hot (above 80°F). Skip seeding and aeration — heat stress makes establishment and recovery unreliable. Warm-season lawns (Tall Fescue, Kentucky Bluegrass, Perennial Ryegrass) are in peak growth; cool-season lawns are in survival mode and need height and water, not projects.
Use the wait to plan fall work: overseeding and aeration in Delaware start once soil falls back toward 72°F.
Estimated soil temperature at Delaware locations
| ZIP code | Est. soil temp | Data through |
|---|---|---|
| 19901 | — | Loading… |
| 19801 | — | Loading… |
| 19711 | — | Loading… |
Values load from each ZIP's nearest NOAA station in the current R2 snapshot. Enter your own ZIP above for a reading closer to home.
How Delaware compares to the rest of the country
Estimated 2–4 inch soil temperature by state . Tap a state for its detailed page.
About Delaware lawns
Delaware is in USDA Hardiness Zones 7a-7b, with a cool-season lawn climate. Common grass types include Tall Fescue, Kentucky Bluegrass, Perennial Ryegrass.
These estimates are modeled from air temperature (about ±5°F at 2–4 inch depth — methodology). For local agronomic guidance, see the University of Delaware Cooperative Extension.
Common Delaware soil temperature questions
What is the current soil temperature in Delaware?
This page shows a statewide estimated 2–4 inch soil temperature for Delaware, recomputed daily from NOAA weather station records, plus per-ZIP estimates for representative Delaware locations. Enter your ZIP code for the reading nearest you.
At what soil temperature should I apply pre-emergent in Delaware?
Apply pre-emergent when Delaware soil temperatures approach 55°F at a 2–4 inch depth in spring — crabgrass germinates as soil holds 55°F and above. In Delaware that typically happens late march to mid-april.
What soil temperature does grass seed need in Delaware?
Cool-season grasses germinate best in 50–65°F soil, while warm-season grasses want 65–80°F. Common Delaware lawns (Tall Fescue, Kentucky Bluegrass, Perennial Ryegrass) should be seeded when soil enters the right range for their type — check the current estimate above.
How accurate is this Delaware soil temperature estimate?
It is modeled from air temperatures with a published lag model, not measured by in-ground sensors, and is typically within about ±5°F at 2–4 inch depth. Shade, moisture, and snow cover shift real readings; for precise numbers use a soil thermometer or University of Delaware Cooperative Extension resources.