What is the soil temperature in ZIP code 18031 today?

About 49°F on average in the top 4 inches (0–10 cm), low 46°F and high 51°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 10.8 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 18031?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from May 6 and 55°F from May 18.

ZIP 18031 · Ancient Oaks, PA · Nov 11, 2026

Soil temperature for ZIP code 18031

49°Faverage today, 0–4 in deep (modelled)
low 46°F · high 51°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 10.8 km from the ZIP centre point

On a week ago

6° cooler

55°F on Nov 4

5-day mean

50°F

what the verdicts use

Held 55°F last spring

May 18

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	54.9°F	51.9°F	58.1°F	analysis
Nov 5	58.1°F	56.6°F	60.5°F	analysis
Nov 6	60.6°F	59.9°F	60.9°F	analysis
Nov 7	55.7°F	53.6°F	58.2°F	analysis
Nov 8	50.9°F	49.9°F	51.6°F	analysis
Nov 9	48.6°F	46.8°F	49.6°F	analysis
Nov 10	47.5°F	44.5°F	50.5°F	analysis
Today	48.8°F	45.9°F	51.0°F	analysis
Nov 12	50.5°F	50.3°F	51.0°F	forecast
Nov 13	45.9°F	43.4°F	48.7°F	forecast
Nov 14	41.0°F	39.9°F	41.5°F	forecast
Nov 15	39.3°F	37.3°F	41.1°F	forecast
Nov 16	40.5°F	38.6°F	42.4°F	forecast
Nov 17	39.9°F	37.3°F	42.0°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 8
50°F	Pre-emergent window opens	May 6
55°F	Crabgrass can germinate	May 18
60°F	Tomatoes	Jun 5
65°F	Warm-season grass seed	not reached

Allentown, PA, 14 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

Nearby ZIP codes

Today's modelled average.

18195 50°F · 18051 49°F · 18087 50°F · 19538 49°F · 18106 50°F · 18046 50°F · 19539 49°F · 19562 49°F

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

Questions

What is the soil temperature in ZIP code 18031 today?: About 49°F on average in the top 4 inches (0–10 cm), low 46°F and high 51°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 10.8 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 18031?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from May 6 and 55°F from May 18.

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).