What is the soil temperature in ZIP code 80455 today?

About 39°F on average in the top 4 inches (0–10 cm), low 37°F and high 42°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 13.7 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 80455?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Jun 4 and 55°F from Jun 18.

ZIP 80455 · Boulder, CO · Nov 11, 2026

Soil temperature for ZIP code 80455

39°Faverage today, 0–4 in deep (modelled)
low 37°F · high 42°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 13.7 km from the ZIP centre point

On a week ago

2° warmer

36°F on Nov 4

5-day mean

39°F

what the verdicts use

Held 55°F last spring

Jun 18

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 lettuceToo cold

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	36.5°F	35.0°F	38.1°F	analysis
Nov 5	36.1°F	35.0°F	37.2°F	analysis
Nov 6	37.0°F	35.2°F	40.1°F	analysis
Nov 7	37.2°F	35.2°F	40.4°F	analysis
Nov 8	38.1°F	35.3°F	42.2°F	analysis
Nov 9	41.6°F	38.2°F	46.1°F	analysis
Nov 10	41.5°F	39.9°F	43.1°F	analysis
Today	39.0°F	36.6°F	41.6°F	analysis
Nov 12	39.2°F	36.1°F	43.5°F	forecast
Nov 13	39.6°F	37.2°F	42.1°F	forecast
Nov 14	38.2°F	36.2°F	40.0°F	forecast
Nov 15	36.3°F	34.8°F	38.4°F	forecast
Nov 16	36.7°F	33.6°F	41.1°F	forecast
Nov 17	39.0°F	36.1°F	43.1°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 21
50°F	Pre-emergent window opens	Jun 4
55°F	Crabgrass can germinate	Jun 18
60°F	Tomatoes	not reached
65°F	Warm-season grass seed	not reached

Boulder, CO, 14 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

Nearby ZIP codes

Today's modelled average.

80302 50°F · 80304 50°F · 80540 40°F · 80481 39°F · 80310 50°F · 80466 39°F · 80301 50°F · 80471 39°F

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

Questions

What is the soil temperature in ZIP code 80455 today?: About 39°F on average in the top 4 inches (0–10 cm), low 37°F and high 42°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 13.7 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 80455?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Jun 4 and 55°F from Jun 18.

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).