ZIP 78021 · Texas · Nov 11, 2026
Soil temperature for ZIP code 78021
low 65°F · high 71°F
Modelled by NOAA GFS, not measured · run Nov 11, 12:00 UTC (7 am Eastern) · grid cell 10.6 km from the ZIP centre point
What the soil says today
- Pre-emergentSeason over
- Cool-season seedToo late in the season
- Warm-season seedWarm enough
- 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 | 73.7°F | 69.4°F | 78.6°F | analysis |
| Nov 5 | 74.5°F | 70.1°F | 78.7°F | analysis |
| Nov 6 | 75.2°F | 73.0°F | 77.3°F | analysis |
| Nov 7 | 71.2°F | 69.9°F | 73.0°F | analysis |
| Nov 8 | 68.5°F | 66.9°F | 70.6°F | analysis |
| Nov 9 | 64.7°F | 64.3°F | 65.8°F | analysis |
| Nov 10 | 64.8°F | 64.2°F | 65.5°F | analysis |
| Today | 67.5°F | 65.2°F | 71.1°F | analysis |
| Nov 12 | 69.2°F | 66.1°F | 72.9°F | forecast |
| Nov 13 | 67.6°F | 63.4°F | 71.3°F | forecast |
| Nov 14 | 65.0°F | 64.0°F | 67.1°F | forecast |
| Nov 15 | 65.2°F | 63.4°F | 68.1°F | forecast |
| Nov 16 | 64.1°F | 62.6°F | 66.5°F | forecast |
| Nov 17 | 60.6°F | 59.9°F | 62.0°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 | never below |
| 50°F | Pre-emergent window opens | Jan 31 |
| 55°F | Crabgrass can germinate | Feb 4 |
| 60°F | Tomatoes | Feb 6 |
| 65°F | Warm-season grass seed | Feb 10 |
Nearby ZIP codes
Today's modelled average.
78072 68°F · 78014 67°F · 78007 68°F · 78011 67°F · 78026 67°F · 78001 68°F · 78017 67°F · 78012 67°F
More: crabgrass timing in Texas · every Texas city · how accurate the model is.
Questions
- What is the soil temperature in ZIP code 78021 today?
- About 68°F on average in the top 4 inches (0–10 cm), low 65°F and high 71°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 10.6 km from the ZIP centre, not a reading from your yard.
- Is it time for crabgrass preventer in 78021?
- The spring window is closed. It opens again when the soil holds 50°F. Last spring the soil held 50°F from Jan 31 and 55°F from Feb 4.
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).