What is the soil temperature in ZIP code 80229 today?

About 57°F on average in the top 4 inches (0–10 cm), low 51°F and high 62°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 12.1 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 80229?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Mar 12 and 55°F from Mar 20.

ZIP 80229 · Thornton, CO · Nov 11, 2026

Soil temperature for ZIP code 80229

57°Faverage today, 0–4 in deep (modelled)
low 51°F · high 62°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 12.1 km from the ZIP centre point

On a week ago

3° warmer

54°F on Nov 4

5-day mean

57°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	53.8°F	49.6°F	58.0°F	analysis
Nov 5	53.9°F	48.9°F	59.8°F	analysis
Nov 6	54.0°F	49.8°F	59.0°F	analysis
Nov 7	54.9°F	48.8°F	62.2°F	analysis
Nov 8	56.2°F	50.3°F	63.2°F	analysis
Nov 9	57.3°F	51.0°F	64.8°F	analysis
Nov 10	57.4°F	51.6°F	63.9°F	analysis
Today	56.8°F	51.3°F	62.4°F	analysis
Nov 12	57.1°F	51.2°F	64.2°F	forecast
Nov 13	56.3°F	51.6°F	60.8°F	forecast
Nov 14	55.1°F	50.7°F	59.5°F	forecast
Nov 15	54.4°F	49.9°F	58.5°F	forecast
Nov 16	53.6°F	48.3°F	59.9°F	forecast
Nov 17	54.5°F	49.0°F	60.7°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 4
50°F	Pre-emergent window opens	Mar 12
55°F	Crabgrass can germinate	Mar 20
60°F	Tomatoes	Mar 21
65°F	Warm-season grass seed	May 26

Denver, CO, 13 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

Nearby ZIP codes

Today's modelled average.

80024 57°F · 80260 57°F · 80233 51°F · 80221 57°F · 80031 57°F · 80234 51°F · 80030 57°F · 80216 57°F

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

Questions

What is the soil temperature in ZIP code 80229 today?: About 57°F on average in the top 4 inches (0–10 cm), low 51°F and high 62°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 12.1 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 80229?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Mar 12 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).