What is the soil temperature in ZIP code 49902 today?

About 43°F on average in the top 4 inches (0–10 cm), low 42°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 11.1 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 49902?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from May 26 and 55°F from May 27.

ZIP 49902 · Iron Mountain, MI · Nov 11, 2026

Soil temperature for ZIP code 49902

43°Faverage today, 0–4 in deep (modelled)
low 42°F · high 44°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 11.1 km from the ZIP centre point

On a week ago

14° cooler

57°F on Nov 4

5-day mean

42°F

what the verdicts use

Held 55°F last spring

May 27

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	57.1°F	56.4°F	57.5°F	analysis
Nov 5	48.7°F	43.2°F	53.9°F	analysis
Nov 6	38.9°F	37.7°F	39.8°F	analysis
Nov 7	37.4°F	35.3°F	40.2°F	analysis
Nov 8	42.3°F	40.2°F	44.8°F	analysis
Nov 9	42.3°F	39.5°F	44.8°F	analysis
Nov 10	44.7°F	42.2°F	46.8°F	analysis
Today	43.1°F	41.8°F	43.7°F	analysis
Nov 12	37.2°F	35.8°F	39.9°F	forecast
Nov 13	33.8°F	33.2°F	35.0°F	forecast
Nov 14	33.9°F	33.0°F	35.7°F	forecast
Nov 15	36.7°F	35.9°F	37.8°F	forecast
Nov 16	35.1°F	33.7°F	37.3°F	forecast
Nov 17	38.5°F	35.5°F	42.4°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	Apr 14
50°F	Pre-emergent window opens	May 26
55°F	Crabgrass can germinate	May 27
60°F	Tomatoes	Jun 6
65°F	Warm-season grass seed	not reached

Nearby ZIP codes

Today's modelled average.

49920 42°F · 49927 43°F · 49915 42°F · 54121 45°F · 49881 43°F · 49801 43°F · 54120 44°F · 49935 42°F

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

Questions

What is the soil temperature in ZIP code 49902 today?: About 43°F on average in the top 4 inches (0–10 cm), low 42°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 11.1 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 49902?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from May 26 and 55°F from May 27.

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).