What is the soil temperature in ZIP code 38021 today?

About 58°F on average in the top 4 inches (0–10 cm), low 54°F and high 64°F, from NOAA's GFS model run of Nov 11, 12:00 UTC (7 am Eastern). It is a model value for a grid cell 14.7 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 38021?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Mar 1 and 55°F from Mar 2.

ZIP 38021 · Humboldt, TN · Nov 11, 2026

Soil temperature for ZIP code 38021

58°Faverage today, 0–4 in deep (modelled)
low 54°F · high 64°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 14.7 km from the ZIP centre point

On a week ago

9° cooler

67°F on Nov 4

5-day mean

54°F

what the verdicts use

Held 55°F last spring

Mar 2

crabgrass germination temperature

What the soil says today

Pre-emergentSeason over
Cool-season seedToo late in the season
Warm-season seedToo cold
TomatoesToo cold
Peas and lettuceWarm enough

From the 5-day mean of the modelled 0–4 in layer.

Soil temperature, 0–4 in: last 7 days and next 7

°F, modelled. Dots and line: daily average (dashed = forecast); bars: low to high; green band: 50–55°F.

View as table

Day	Average	Low	High
Nov 4	67.3°F	66.5°F	68.3°F	analysis
Nov 5	61.8°F	58.4°F	64.8°F	analysis
Nov 6	59.9°F	58.0°F	61.4°F	analysis
Nov 7	53.0°F	50.5°F	55.2°F	analysis
Nov 8	50.8°F	46.7°F	55.0°F	analysis
Nov 9	53.5°F	48.7°F	59.2°F	analysis
Nov 10	55.9°F	52.1°F	59.7°F	analysis
Today	58.4°F	53.9°F	64.2°F	analysis
Nov 12	59.2°F	57.3°F	61.8°F	forecast
Nov 13	50.6°F	48.2°F	53.9°F	forecast
Nov 14	45.7°F	42.0°F	48.7°F	forecast
Nov 15	45.3°F	41.8°F	48.6°F	forecast
Nov 16	47.0°F	43.3°F	50.8°F	forecast
Nov 17	47.4°F	43.5°F	51.1°F	forecast

Source: NOAA NCEP GFS 0.25°, 0–10 cm soil temperature, run Nov 11, 12:00 UTC (7 am Eastern).

Spring 2026 threshold dates

From the 5-day mean held for 10 days or more.

Soil	What it means	Held from (spring 2026)
40°F	Peas and lettuce	Feb 10
50°F	Pre-emergent window opens	Mar 1
55°F	Crabgrass can germinate	Mar 2
60°F	Tomatoes	Apr 11
65°F	Warm-season grass seed	May 17

Dyersburg, TN, 26 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

Nearby ZIP codes

Today's modelled average.

38034 59°F · 38001 58°F · 38050 58°F · 38070 59°F · 38337 58°F · 38037 59°F · 38382 58°F · 38006 58°F

More: crabgrass timing in Tennessee · every Tennessee city · how accurate the model is.

Questions

What is the soil temperature in ZIP code 38021 today?: About 58°F on average in the top 4 inches (0–10 cm), low 54°F and high 64°F, from NOAA's GFS model run of Nov 11, 12:00 UTC (7 am Eastern). It is a model value for a grid cell 14.7 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 38021?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Mar 1 and 55°F from Mar 2.

Data: Global Forecast System (GFS) 0.25°, soil temperature 0–10 cm (TSOIL) (NOAA National Centers for Environmental Prediction (NCEP)); 2025 Gazetteer ZIP Code Tabulation Areas (ZCTA) and 2024 cartographic boundary state outlines (U.S. Census Bureau).