What is the soil temperature in ZIP code 93401 today?

About 65°F on average in the top 4 inches (0–10 cm), low 61°F and high 71°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 10.6 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 93401?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Jan 14 and 55°F from Jan 16.

ZIP 93401 · San Luis Obispo, CA · Nov 11, 2026

Soil temperature for ZIP code 93401

65°Faverage today, 0–4 in deep (modelled)
low 61°F · high 71°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 10.6 km from the ZIP centre point

On a week ago

6° warmer

59°F on Nov 4

5-day mean

65°F

what the verdicts use

Held 55°F last spring

Jan 16

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	59.0°F	55.7°F	63.7°F	analysis
Nov 5	60.1°F	57.7°F	64.4°F	analysis
Nov 6	60.1°F	56.2°F	65.9°F	analysis
Nov 7	62.2°F	57.5°F	69.6°F	analysis
Nov 8	64.3°F	59.8°F	71.9°F	analysis
Nov 9	65.4°F	61.1°F	72.2°F	analysis
Nov 10	65.3°F	61.5°F	71.6°F	analysis
Today	65.4°F	61.2°F	71.3°F	analysis
Nov 12	64.2°F	61.4°F	67.6°F	forecast
Nov 13	60.9°F	58.9°F	62.7°F	forecast
Nov 14	59.9°F	57.3°F	64.0°F	forecast
Nov 15	58.6°F	55.1°F	63.0°F	forecast
Nov 16	57.9°F	56.2°F	59.9°F	forecast
Nov 17	58.4°F	56.8°F	61.4°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	never below
50°F	Pre-emergent window opens	Jan 14
55°F	Crabgrass can germinate	Jan 16
60°F	Tomatoes	Mar 14
65°F	Warm-season grass seed	Mar 18

San Luis Obispo, CA, 7 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

Nearby ZIP codes

Today's modelled average.

93410 66°F · 93449 66°F · 93407 66°F · 93409 66°F · 93433 66°F · 93405 66°F · 93408 66°F · 93420 65°F

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

Questions

What is the soil temperature in ZIP code 93401 today?: About 65°F on average in the top 4 inches (0–10 cm), low 61°F and high 71°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 10.6 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 93401?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Jan 14 and 55°F from Jan 16.

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).