What is the soil temperature in ZIP code 17321 today?

About 51°F on average in the top 4 inches (0–10 cm), low 48°F and high 53°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 4.8 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 17321?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from May 5 and 55°F from May 17.

ZIP 17321 · Red Lion, PA · Nov 11, 2026

Soil temperature for ZIP code 17321

51°Faverage today, 0–4 in deep (modelled)
low 48°F · high 53°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 4.8 km from the ZIP centre point

On a week ago

5° cooler

56°F on Nov 4

5-day mean

52°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	56.3°F	53.5°F	59.1°F	analysis
Nov 5	60.4°F	58.6°F	62.3°F	analysis
Nov 6	61.9°F	61.2°F	62.4°F	analysis
Nov 7	55.7°F	53.4°F	59.1°F	analysis
Nov 8	51.4°F	49.9°F	52.5°F	analysis
Nov 9	50.8°F	49.0°F	51.7°F	analysis
Nov 10	49.8°F	46.9°F	52.8°F	analysis
Today	50.9°F	48.1°F	52.7°F	analysis
Nov 12	51.6°F	51.2°F	52.5°F	forecast
Nov 13	47.0°F	45.2°F	49.8°F	forecast
Nov 14	41.5°F	39.5°F	42.4°F	forecast
Nov 15	40.5°F	38.4°F	41.9°F	forecast
Nov 16	40.7°F	37.9°F	42.9°F	forecast
Nov 17	40.4°F	37.7°F	42.5°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 7
50°F	Pre-emergent window opens	May 5
55°F	Crabgrass can germinate	May 17
60°F	Tomatoes	Jun 5
65°F	Warm-season grass seed	Jun 8

Bel Air South, MD, 29 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

Nearby ZIP codes

Today's modelled average.

17352 51°F · 21132 51°F · 17302 51°F · 17314 51°F · 17363 51°F · 21154 51°F · 21160 51°F · 17309 51°F

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

Questions

What is the soil temperature in ZIP code 17321 today?: About 51°F on average in the top 4 inches (0–10 cm), low 48°F and high 53°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 4.8 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 17321?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from May 5 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).