What is the soil temperature in ZIP code 59430 today?

About 50°F on average in the top 4 inches (0–10 cm), low 47°F and high 56°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 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 59430?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from May 2 and 55°F from Jun 6.

ZIP 59430 · Montana · Nov 11, 2026

Soil temperature for ZIP code 59430

50°Faverage today, 0–4 in deep (modelled)
low 47°F · high 56°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 8 km from the ZIP centre point

On a week ago

9° warmer

41°F on Nov 4

5-day mean

49°F

what the verdicts use

Held 55°F last spring

Jun 6

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	41.1°F	37.7°F	45.6°F	analysis
Nov 5	41.4°F	36.8°F	47.9°F	analysis
Nov 6	44.1°F	40.8°F	48.9°F	analysis
Nov 7	50.2°F	47.2°F	54.7°F	analysis
Nov 8	49.0°F	45.2°F	53.8°F	analysis
Nov 9	46.3°F	43.8°F	48.7°F	analysis
Nov 10	46.7°F	43.3°F	52.2°F	analysis
Today	50.5°F	46.7°F	56.0°F	analysis
Nov 12	51.5°F	48.8°F	54.6°F	forecast
Nov 13	47.3°F	44.7°F	49.9°F	forecast
Nov 14	45.9°F	41.1°F	52.2°F	forecast
Nov 15	46.2°F	43.1°F	49.9°F	forecast
Nov 16	45.9°F	43.3°F	49.5°F	forecast
Nov 17	44.8°F	42.4°F	47.8°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	Mar 19
50°F	Pre-emergent window opens	May 2
55°F	Crabgrass can germinate	Jun 6
60°F	Tomatoes	Jun 18
65°F	Warm-season grass seed	not reached

This ZIP code area covers about 515 square miles; the reading is for the model grid cell nearest its Census centre point, which can be far from where you are. Try a neighbouring ZIP if it looks off.

Nearby ZIP codes

Today's modelled average.

59424 50°F · 59451 50°F · 59446 51°F · 59462 50°F · 59489 49°F · 59457 47°F · 59447 48°F · 59479 48°F

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

Questions

What is the soil temperature in ZIP code 59430 today?: About 50°F on average in the top 4 inches (0–10 cm), low 47°F and high 56°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 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 59430?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from May 2 and 55°F from Jun 6.

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).