ZIP 99921 · Alaska · Nov 11, 2026
Soil temperature for ZIP code 99921
low 42°F · high 44°F
Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 3.5 km from the ZIP centre point
What the soil says today
- Pre-emergentSeason over
- Cool-season seedToo late in the season
- Warm-season seedToo cold
- TomatoesToo cold
- Peas and lettuceToo cold
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 | 42.6°F | 41.8°F | 43.1°F | analysis |
| Nov 5 | 41.6°F | 40.8°F | 42.8°F | analysis |
| Nov 6 | 41.7°F | 40.6°F | 42.7°F | analysis |
| Nov 7 | 38.4°F | 37.3°F | 40.2°F | analysis |
| Nov 8 | 38.0°F | 37.3°F | 38.6°F | analysis |
| Nov 9 | 39.1°F | 37.9°F | 39.9°F | analysis |
| Nov 10 | 40.4°F | 39.5°F | 42.4°F | analysis |
| Today | 43.4°F | 42.5°F | 44.4°F | analysis |
| Nov 12 | 40.4°F | 39.0°F | 42.6°F | forecast |
| Nov 13 | 38.6°F | 37.9°F | 39.3°F | forecast |
| Nov 14 | 39.1°F | 38.6°F | 39.8°F | forecast |
| Nov 15 | 41.0°F | 40.0°F | 42.1°F | forecast |
| Nov 16 | 41.4°F | 40.8°F | 42.0°F | forecast |
| Nov 17 | 41.4°F | 41.1°F | 41.6°F | forecast |
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 | Apr 27 |
| 50°F | Pre-emergent window opens | not reached |
| 55°F | Crabgrass can germinate | not reached |
| 60°F | Tomatoes | not reached |
| 65°F | Warm-season grass seed | not reached |
This ZIP code area covers about 2,241 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.
99925 44°F · 99919 45°F · 99922 46°F · 99918 43°F · 99903 42°F
More: crabgrass timing in Alaska · every Alaska city · how accurate the model is.
Questions
- What is the soil temperature in ZIP code 99921 today?
- About 43°F on average in the top 4 inches (0–10 cm), low 42°F and high 44°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 3.5 km from the ZIP centre, not a reading from your yard.
- Is it time for crabgrass preventer in 99921?
- The spring window is closed. It opens again when the soil holds 50°F.
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).