What is the soil temperature in ZIP code 80521 today?

About 47°F on average in the top 4 inches (0–10 cm), low 44°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 14.6 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 80521?

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 Mar 21.

ZIP 80521 · Fort Collins, CO · Nov 11, 2026

Soil temperature for ZIP code 80521

47°Faverage today, 0–4 in deep (modelled)
low 44°F · high 51°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 14.6 km from the ZIP centre point

On a week ago

3° warmer

44°F on Nov 4

5-day mean

47°F

what the verdicts use

Held 55°F last spring

Mar 21

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	44.0°F	40.4°F	47.6°F	analysis
Nov 5	44.2°F	39.9°F	49.6°F	analysis
Nov 6	44.0°F	40.0°F	49.0°F	analysis
Nov 7	44.6°F	40.0°F	50.3°F	analysis
Nov 8	46.0°F	41.8°F	51.2°F	analysis
Nov 9	48.4°F	44.0°F	54.3°F	analysis
Nov 10	47.6°F	43.1°F	52.7°F	analysis
Today	47.3°F	43.6°F	51.1°F	analysis
Nov 12	47.5°F	43.3°F	52.8°F	forecast
Nov 13	47.2°F	44.0°F	50.5°F	forecast
Nov 14	44.6°F	41.3°F	47.8°F	forecast
Nov 15	43.5°F	40.0°F	47.6°F	forecast
Nov 16	42.2°F	38.1°F	46.8°F	forecast
Nov 17	42.9°F	38.4°F	48.4°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 27
50°F	Pre-emergent window opens	Mar 21
55°F	Crabgrass can germinate	Mar 21
60°F	Tomatoes	Jun 4
65°F	Warm-season grass seed	Jun 19

Fort Collins, CO, 4 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

Nearby ZIP codes

Today's modelled average.

80526 47°F · 80524 50°F · 80525 52°F · 80538 47°F · 80528 52°F · 80547 52°F · 80535 47°F · 80550 52°F

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

Questions

What is the soil temperature in ZIP code 80521 today?: About 47°F on average in the top 4 inches (0–10 cm), low 44°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 14.6 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 80521?: 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 Mar 21.

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).