What is the soil temperature in ZIP code 99350 today?

About 51°F on average in the top 4 inches (0–10 cm), low 48°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 12 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 99350?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Apr 5 and 55°F from Apr 30.

ZIP 99350 · Prosser, WA · Nov 11, 2026

Soil temperature for ZIP code 99350

51°Faverage today, 0–4 in deep (modelled)
low 48°F · high 56°F

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

On a week ago

5° warmer

46°F on Nov 4

5-day mean

51°F

what the verdicts use

Held 55°F last spring

Apr 30

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	45.7°F	42.2°F	51.3°F	analysis
Nov 5	48.5°F	45.6°F	54.6°F	analysis
Nov 6	48.4°F	44.9°F	54.1°F	analysis
Nov 7	52.2°F	49.9°F	56.1°F	analysis
Nov 8	53.0°F	51.5°F	56.1°F	analysis
Nov 9	51.2°F	48.9°F	54.1°F	analysis
Nov 10	49.5°F	48.2°F	50.8°F	analysis
Today	50.8°F	48.3°F	55.6°F	analysis
Nov 12	50.6°F	47.9°F	54.5°F	forecast
Nov 13	49.3°F	47.6°F	51.6°F	forecast
Nov 14	48.7°F	46.1°F	52.7°F	forecast
Nov 15	48.7°F	46.8°F	51.9°F	forecast
Nov 16	50.0°F	48.2°F	52.7°F	forecast
Nov 17	46.7°F	43.5°F	50.0°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 2
50°F	Pre-emergent window opens	Apr 5
55°F	Crabgrass can germinate	Apr 30
60°F	Tomatoes	May 3
65°F	Warm-season grass seed	May 24

Sunnyside, WA, 29 km away: the full city page, with the 2026 season chart, growing degree days and nearby cities →

This ZIP code area covers about 600 square miles; the reading is for the model grid cell nearest its Census centre point, which can be far from where you are. Try a neighbouring ZIP if it looks off.

Nearby ZIP codes

Today's modelled average.

98930 52°F · 99345 53°F · 98935 52°F · 99320 51°F · 97844 53°F · 99353 51°F · 99346 53°F · 99338 52°F

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

Questions

What is the soil temperature in ZIP code 99350 today?: About 51°F on average in the top 4 inches (0–10 cm), low 48°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 12 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 99350?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Apr 5 and 55°F from Apr 30.

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).