What is the soil temperature in ZIP code 50433 today?

About 51°F on average in the top 4 inches (0–10 cm), low 48°F and high 54°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 8.8 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 50433?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Apr 13 and 55°F from May 12.

ZIP 50433 · Mason City, IA · Nov 11, 2026

Soil temperature for ZIP code 50433

51°Faverage today, 0–4 in deep (modelled)
low 48°F · high 54°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 8.8 km from the ZIP centre point

On a week ago

3° cooler

54°F on Nov 4

5-day mean

48°F

what the verdicts use

Held 55°F last spring

May 12

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	53.7°F	50.1°F	58.2°F	analysis
Nov 5	49.1°F	48.5°F	49.8°F	analysis
Nov 6	44.7°F	41.8°F	46.3°F	analysis
Nov 7	42.8°F	38.9°F	46.9°F	analysis
Nov 8	46.7°F	43.6°F	50.5°F	analysis
Nov 9	47.5°F	42.9°F	53.1°F	analysis
Nov 10	49.7°F	45.4°F	53.7°F	analysis
Today	50.9°F	48.5°F	53.6°F	analysis
Nov 12	44.6°F	42.9°F	48.2°F	forecast
Nov 13	37.8°F	36.4°F	38.8°F	forecast
Nov 14	37.0°F	35.3°F	40.0°F	forecast
Nov 15	37.6°F	35.9°F	40.9°F	forecast
Nov 16	38.6°F	35.0°F	42.6°F	forecast
Nov 17	40.4°F	37.0°F	44.3°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 22
50°F	Pre-emergent window opens	Apr 13
55°F	Crabgrass can germinate	May 12
60°F	Tomatoes	May 26
65°F	Warm-season grass seed	May 27

Mason City, IA, 28 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

Nearby ZIP codes

Today's modelled average.

50605 51°F · 50653 51°F · 50468 51°F · 50469 51°F · 50475 51°F · 50611 51°F · 50427 51°F · 50636 51°F

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

Questions

What is the soil temperature in ZIP code 50433 today?: About 51°F on average in the top 4 inches (0–10 cm), low 48°F and high 54°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 8.8 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 50433?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Apr 13 and 55°F from May 12.

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).