What is the soil temperature in ZIP code 84621 today?

About 46°F on average in the top 4 inches (0–10 cm), low 40°F and high 53°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 9.3 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 84621?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Mar 18 and 55°F from Mar 20.

ZIP 84621 · Richfield, UT · Nov 11, 2026

Soil temperature for ZIP code 84621

46°Faverage today, 0–4 in deep (modelled)
low 40°F · high 53°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 9.3 km from the ZIP centre point

On a week ago

4° warmer

42°F on Nov 4

5-day mean

46°F

what the verdicts use

Held 55°F last spring

Mar 20

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	41.8°F	39.9°F	43.3°F	analysis
Nov 5	41.9°F	39.2°F	46.8°F	analysis
Nov 6	43.1°F	39.0°F	48.4°F	analysis
Nov 7	43.0°F	38.8°F	49.8°F	analysis
Nov 8	46.4°F	40.9°F	54.3°F	analysis
Nov 9	47.5°F	42.2°F	55.3°F	analysis
Nov 10	47.5°F	42.9°F	53.1°F	analysis
Today	45.5°F	40.0°F	52.7°F	analysis
Nov 12	46.2°F	40.6°F	53.7°F	forecast
Nov 13	46.2°F	42.0°F	51.3°F	forecast
Nov 14	43.6°F	42.2°F	46.2°F	forecast
Nov 15	39.5°F	37.6°F	43.1°F	forecast
Nov 16	41.1°F	37.5°F	46.9°F	forecast
Nov 17	42.3°F	38.1°F	48.7°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	Feb 6
50°F	Pre-emergent window opens	Mar 18
55°F	Crabgrass can germinate	Mar 20
60°F	Tomatoes	Mar 22
65°F	Warm-season grass seed	Jun 4

Nearby ZIP codes

Today's modelled average.

84652 44°F · 84622 46°F · 84634 45°F · 84643 45°F · 84620 44°F · 84665 39°F · 84654 41°F · 84657 44°F

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

Questions

What is the soil temperature in ZIP code 84621 today?: About 46°F on average in the top 4 inches (0–10 cm), low 40°F and high 53°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 9.3 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 84621?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Mar 18 and 55°F from Mar 20.

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).