What is the soil temperature in ZIP code 55609 today?

About 44°F on average in the top 4 inches (0–10 cm), low 44°F and high 44°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 4.7 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 55609?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from May 27 and 55°F from Jun 5.

ZIP 55609 · Duluth, MN · Nov 11, 2026

Soil temperature for ZIP code 55609

44°Faverage today, 0–4 in deep (modelled)
low 44°F · high 44°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 4.7 km from the ZIP centre point

On a week ago

7° cooler

51°F on Nov 4

5-day mean

42°F

what the verdicts use

Held 55°F last spring

Jun 5

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	50.9°F	50.5°F	51.2°F	analysis
Nov 5	45.5°F	42.3°F	49.0°F	analysis
Nov 6	38.8°F	38.0°F	40.0°F	analysis
Nov 7	37.1°F	36.1°F	39.2°F	analysis
Nov 8	42.3°F	40.6°F	44.1°F	analysis
Nov 9	42.3°F	40.2°F	45.4°F	analysis
Nov 10	44.5°F	42.8°F	46.1°F	analysis
Today	44.0°F	43.5°F	44.5°F	analysis
Nov 12	38.5°F	37.2°F	39.5°F	forecast
Nov 13	34.7°F	33.7°F	36.6°F	forecast
Nov 14	33.0°F	32.6°F	33.8°F	forecast
Nov 15	34.7°F	32.5°F	37.4°F	forecast
Nov 16	36.2°F	35.0°F	37.8°F	forecast
Nov 17	39.1°F	37.0°F	41.8°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	May 12
50°F	Pre-emergent window opens	May 27
55°F	Crabgrass can germinate	Jun 5
60°F	Tomatoes	not reached
65°F	Warm-season grass seed	not reached

Duluth, MN, 32 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

Nearby ZIP codes

Today's modelled average.

55804 43°F · 55803 43°F · 55812 45°F · 55805 45°F · 55802 45°F · 55616 42°F · 55806 44°F · 55814 44°F

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

Questions

What is the soil temperature in ZIP code 55609 today?: About 44°F on average in the top 4 inches (0–10 cm), low 44°F and high 44°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 4.7 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 55609?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from May 27 and 55°F from Jun 5.

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).