What is the soil temperature in ZIP code 82421 today?

About 45°F on average in the top 4 inches (0–10 cm), low 41°F and high 51°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 14.9 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 82421?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Mar 21 and 55°F from May 3.

ZIP 82421 · Powell, WY · Nov 11, 2026

Soil temperature for ZIP code 82421

45°Faverage today, 0–4 in deep (modelled)
low 41°F · high 51°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 14.9 km from the ZIP centre point

On a week ago

3° warmer

42°F on Nov 4

5-day mean

45°F

what the verdicts use

Held 55°F last spring

May 3

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	42.2°F	37.2°F	49.3°F	analysis
Nov 5	43.7°F	39.2°F	49.5°F	analysis
Nov 6	44.2°F	40.0°F	49.0°F	analysis
Nov 7	43.8°F	39.7°F	49.7°F	analysis
Nov 8	45.4°F	41.4°F	50.6°F	analysis
Nov 9	45.4°F	41.1°F	50.9°F	analysis
Nov 10	46.8°F	42.6°F	52.8°F	analysis
Today	45.2°F	40.6°F	50.8°F	analysis
Nov 12	46.1°F	42.5°F	50.5°F	forecast
Nov 13	45.3°F	42.0°F	49.5°F	forecast
Nov 14	45.0°F	42.0°F	49.2°F	forecast
Nov 15	43.2°F	39.1°F	48.0°F	forecast
Nov 16	43.5°F	40.0°F	47.3°F	forecast
Nov 17	42.6°F	38.2°F	47.7°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 2
50°F	Pre-emergent window opens	Mar 21
55°F	Crabgrass can germinate	May 3
60°F	Tomatoes	May 25
65°F	Warm-season grass seed	May 27

Nearby ZIP codes

Today's modelled average.

82423 45°F · 82420 45°F · 82412 47°F · 82440 47°F · 59014 49°F · 82431 47°F · 82435 47°F · 59008 48°F

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

Questions

What is the soil temperature in ZIP code 82421 today?: About 45°F on average in the top 4 inches (0–10 cm), low 41°F and high 51°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 14.9 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 82421?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Mar 21 and 55°F from May 3.

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).