What is the soil temperature in ZIP code 92321 today?

About 61°F on average in the top 4 inches (0–10 cm), low 57°F and high 68°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 9.4 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 92321?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Jan 16 and 55°F from Mar 11.

ZIP 92321 · Lake Arrowhead, CA · Nov 11, 2026

Soil temperature for ZIP code 92321

61°Faverage today, 0–4 in deep (modelled)
low 57°F · high 68°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 9.4 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 11

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	55.6°F	51.0°F	62.0°F	analysis
Nov 5	56.6°F	52.1°F	63.2°F	analysis
Nov 6	57.2°F	53.5°F	62.5°F	analysis
Nov 7	58.0°F	53.5°F	64.9°F	analysis
Nov 8	59.7°F	54.9°F	66.9°F	analysis
Nov 9	61.7°F	56.6°F	69.5°F	analysis
Nov 10	61.9°F	57.7°F	67.7°F	analysis
Today	61.3°F	56.8°F	68.1°F	analysis
Nov 12	61.0°F	56.8°F	66.4°F	forecast
Nov 13	59.0°F	55.9°F	62.5°F	forecast
Nov 14	55.4°F	54.0°F	57.9°F	forecast
Nov 15	55.1°F	52.2°F	60.9°F	forecast
Nov 16	56.0°F	52.1°F	61.2°F	forecast
Nov 17	55.5°F	53.7°F	57.7°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	never below
50°F	Pre-emergent window opens	Jan 16
55°F	Crabgrass can germinate	Mar 11
60°F	Tomatoes	Mar 14
65°F	Warm-season grass seed	Mar 17

Highland, CA, 15 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

Nearby ZIP codes

Today's modelled average.

92352 61°F · 92317 61°F · 92382 55°F · 92378 61°F · 92341 55°F · 92391 61°F · 92385 61°F · 92404 61°F

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

Questions

What is the soil temperature in ZIP code 92321 today?: About 61°F on average in the top 4 inches (0–10 cm), low 57°F and high 68°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 9.4 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 92321?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Jan 16 and 55°F from Mar 11.

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).