What is the soil temperature in ZIP code 99338 today?

About 52°F on average in the top 4 inches (0–10 cm), low 50°F and high 56°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 8.7 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 99338?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Mar 19 and 55°F from Apr 28.

ZIP 99338 · Kennewick, WA · Nov 11, 2026

Soil temperature for ZIP code 99338

52°Faverage today, 0–4 in deep (modelled)
low 50°F · high 56°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 8.7 km from the ZIP centre point

On a week ago

5° warmer

47°F on Nov 4

5-day mean

53°F

what the verdicts use

Held 55°F last spring

Apr 28

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	47.0°F	43.3°F	53.3°F	analysis
Nov 5	50.5°F	48.0°F	56.4°F	analysis
Nov 6	50.2°F	47.2°F	54.6°F	analysis
Nov 7	53.4°F	51.5°F	57.1°F	analysis
Nov 8	54.4°F	52.6°F	57.9°F	analysis
Nov 9	53.2°F	51.0°F	56.3°F	analysis
Nov 10	52.2°F	50.5°F	53.9°F	analysis
Today	52.0°F	49.6°F	56.2°F	analysis
Nov 12	51.7°F	49.2°F	55.6°F	forecast
Nov 13	50.1°F	48.2°F	52.2°F	forecast
Nov 14	51.1°F	48.5°F	55.4°F	forecast
Nov 15	50.4°F	47.9°F	54.2°F	forecast
Nov 16	52.2°F	50.6°F	54.1°F	forecast
Nov 17	48.3°F	45.6°F	50.9°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	Jan 7
50°F	Pre-emergent window opens	Mar 19
55°F	Crabgrass can germinate	Apr 28
60°F	Tomatoes	May 2
65°F	Warm-season grass seed	May 4

Kennewick, WA, 11 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

Nearby ZIP codes

Today's modelled average.

99352 52°F · 99336 52°F · 99346 53°F · 99354 52°F · 99353 51°F · 99337 52°F · 99320 51°F · 97882 53°F

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

Questions

What is the soil temperature in ZIP code 99338 today?: About 52°F on average in the top 4 inches (0–10 cm), low 50°F and high 56°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 8.7 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 99338?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Mar 19 and 55°F from Apr 28.

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).