What is the soil temperature in ZIP code 94503 today?

About 62°F on average in the top 4 inches (0–10 cm), low 59°F and high 67°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 7.3 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 94503?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Jan 31 and 55°F from Mar 8.

ZIP 94503 · American Canyon, CA · Nov 11, 2026

Soil temperature for ZIP code 94503

62°Faverage today, 0–4 in deep (modelled)
low 59°F · high 67°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 7.3 km from the ZIP centre point

On a week ago

6° warmer

56°F on Nov 4

5-day mean

61°F

what the verdicts use

Held 55°F last spring

Mar 8

crabgrass germination temperature

What the soil says today

Pre-emergentSeason over
Cool-season seedToo late in the season
Warm-season seedToo cold
TomatoesSoil warm enough
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	56.2°F	53.2°F	62.4°F	analysis
Nov 5	59.1°F	55.2°F	66.1°F	analysis
Nov 6	59.8°F	56.2°F	65.9°F	analysis
Nov 7	60.4°F	56.9°F	66.1°F	analysis
Nov 8	59.8°F	56.2°F	65.4°F	analysis
Nov 9	60.6°F	57.3°F	66.1°F	analysis
Nov 10	62.3°F	58.9°F	68.4°F	analysis
Today	62.0°F	58.7°F	67.3°F	analysis
Nov 12	61.1°F	58.4°F	65.1°F	forecast
Nov 13	59.5°F	57.9°F	60.9°F	forecast
Nov 14	54.6°F	51.9°F	59.0°F	forecast
Nov 15	55.6°F	53.7°F	58.5°F	forecast
Nov 16	56.2°F	55.4°F	57.5°F	forecast
Nov 17	54.8°F	52.7°F	59.5°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	never below
50°F	Pre-emergent window opens	Jan 31
55°F	Crabgrass can germinate	Mar 8
60°F	Tomatoes	Mar 17
65°F	Warm-season grass seed	Jun 11

Fairfield, CA, 17 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

Nearby ZIP codes

Today's modelled average.

94589 62°F · 94591 62°F · 94559 62°F · 94590 66°F · 94534 63°F · 94592 66°F · 94510 66°F · 94525 66°F

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

Questions

What is the soil temperature in ZIP code 94503 today?: About 62°F on average in the top 4 inches (0–10 cm), low 59°F and high 67°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 7.3 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 94503?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Jan 31 and 55°F from Mar 8.

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).