What is the soil temperature in ZIP code 98840 today?

About 48°F on average in the top 4 inches (0–10 cm), low 46°F and high 52°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 4.8 km from the ZIP centre, not a reading from your yard.

Is it time for crabgrass preventer in 98840?

The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Apr 29 and 55°F from May 1.

ZIP 98840 · Washington · Nov 11, 2026

Soil temperature for ZIP code 98840

48°Faverage today, 0–4 in deep (modelled)
low 46°F · high 52°F

Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 4.8 km from the ZIP centre point

On a week ago

8° warmer

40°F on Nov 4

5-day mean

44°F

what the verdicts use

Held 55°F last spring

May 1

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	39.8°F	36.8°F	44.9°F	analysis
Nov 5	42.7°F	40.8°F	46.7°F	analysis
Nov 6	42.3°F	41.5°F	43.2°F	analysis
Nov 7	41.3°F	38.2°F	45.2°F	analysis
Nov 8	44.4°F	42.5°F	48.3°F	analysis
Nov 9	42.3°F	39.7°F	46.1°F	analysis
Nov 10	44.8°F	43.8°F	46.5°F	analysis
Today	47.6°F	45.8°F	51.7°F	analysis
Nov 12	44.4°F	41.7°F	47.8°F	forecast
Nov 13	44.4°F	41.8°F	49.6°F	forecast
Nov 14	47.0°F	45.4°F	48.7°F	forecast
Nov 15	43.9°F	43.2°F	45.2°F	forecast
Nov 16	44.6°F	43.6°F	46.8°F	forecast
Nov 17	38.5°F	35.2°F	41.4°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	Mar 18
50°F	Pre-emergent window opens	Apr 29
55°F	Crabgrass can germinate	May 1
60°F	Tomatoes	May 24
65°F	Warm-season grass seed	Jun 16

This ZIP code area covers about 533 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.

98841 44°F · 98829 45°F · 98812 45°F · 98849 47°F · 98813 47°F · 99155 46°F · 98819 44°F · 99133 48°F

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

Questions

What is the soil temperature in ZIP code 98840 today?: About 48°F on average in the top 4 inches (0–10 cm), low 46°F and high 52°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 4.8 km from the ZIP centre, not a reading from your yard.
Is it time for crabgrass preventer in 98840?: The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Apr 29 and 55°F from May 1.

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).