What is the soil temperature in ZIP code 52639 today?

About 54°F on average in the top 4 inches (0–10 cm), low 51°F and high 57°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 4.1 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 52639?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Mar 22 and 55°F from Apr 12.

ZIP 52639 · Keokuk, IA · Nov 11, 2026

Soil temperature for ZIP code 52639

54°Faverage today, 0–4 in deep (modelled)
low 51°F · high 57°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 4.1 km from the ZIP centre point

On a week ago

4° cooler

59°F on Nov 4

5-day mean

51°F

what the verdicts use

Held 55°F last spring

Apr 12

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	58.6°F	56.5°F	61.7°F	analysis
Nov 5	52.1°F	51.2°F	53.0°F	analysis
Nov 6	50.7°F	49.9°F	51.5°F	analysis
Nov 7	45.3°F	41.7°F	48.6°F	analysis
Nov 8	47.6°F	42.7°F	53.8°F	analysis
Nov 9	50.9°F	45.9°F	56.6°F	analysis
Nov 10	54.8°F	51.4°F	58.0°F	analysis
Today	54.3°F	51.3°F	56.8°F	analysis
Nov 12	49.4°F	47.0°F	52.7°F	forecast
Nov 13	41.3°F	38.2°F	43.1°F	forecast
Nov 14	39.8°F	35.7°F	43.9°F	forecast
Nov 15	41.0°F	36.9°F	45.0°F	forecast
Nov 16	42.1°F	37.7°F	46.5°F	forecast
Nov 17	43.1°F	39.0°F	47.1°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	Mar 1
50°F	Pre-emergent window opens	Mar 22
55°F	Crabgrass can germinate	Apr 12
60°F	Tomatoes	May 25
65°F	Warm-season grass seed	May 28

Burlington, IA, 43 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

Nearby ZIP codes

Today's modelled average.

52619 54°F · 52632 54°F · 62354 54°F · 52625 53°F · 63472 54°F · 63430 54°F · 63465 54°F · 52627 53°F

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

Questions

What is the soil temperature in ZIP code 52639 today?: About 54°F on average in the top 4 inches (0–10 cm), low 51°F and high 57°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 4.1 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 52639?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Mar 22 and 55°F from Apr 12.

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).