What is the soil temperature in ZIP code 46740 today?

About 51°F on average in the top 4 inches (0–10 cm), low 47°F and high 55°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 12 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 46740?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Apr 12 and 55°F from May 17.

ZIP 46740 · Portland, IN · Nov 11, 2026

Soil temperature for ZIP code 46740

51°Faverage today, 0–4 in deep (modelled)
low 47°F · high 55°F

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

On a week ago

13° cooler

65°F on Nov 4

5-day mean

49°F

what the verdicts use

Held 55°F last spring

May 17

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	64.6°F	64.2°F	65.2°F	analysis
Nov 5	58.3°F	55.5°F	60.9°F	analysis
Nov 6	53.2°F	51.2°F	56.0°F	analysis
Nov 7	48.8°F	46.7°F	49.9°F	analysis
Nov 8	46.4°F	42.2°F	51.1°F	analysis
Nov 9	49.2°F	45.1°F	53.0°F	analysis
Nov 10	51.4°F	47.4°F	55.4°F	analysis
Today	51.3°F	47.2°F	55.0°F	analysis
Nov 12	50.2°F	48.8°F	52.3°F	forecast
Nov 13	43.4°F	41.8°F	44.9°F	forecast
Nov 14	39.6°F	35.9°F	42.7°F	forecast
Nov 15	39.9°F	35.9°F	42.9°F	forecast
Nov 16	39.6°F	35.2°F	43.1°F	forecast
Nov 17	41.0°F	36.2°F	45.4°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 5
50°F	Pre-emergent window opens	Apr 12
55°F	Crabgrass can germinate	May 17
60°F	Tomatoes	May 27
65°F	Warm-season grass seed	Jun 7

Huntington, IN, 55 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

Nearby ZIP codes

Today's modelled average.

47326 51°F · 46711 51°F · 46772 51°F · 46778 52°F · 46759 52°F · 47369 52°F · 47371 51°F · 46714 51°F

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

Questions

What is the soil temperature in ZIP code 46740 today?: About 51°F on average in the top 4 inches (0–10 cm), low 47°F and high 55°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 12 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 46740?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Apr 12 and 55°F from May 17.

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).