Live soil temperature · 2 inches down
Soil temperature in Manassas, VA
Right now · 20110
46.3°FCold
Annual bluegrass (Poa annua) and winter annual weeds: First fall window has passed. Most labels call for a second application 8 to 10 weeks after the first. Pre-emergent is a product that stops weed seeds before they sprout, so it only works ahead of germination.
By depth
- Surface
- 40.4°F
- 2 in depth
- 46.3°F
- 6 in depth
- 55.6°F
Past 14 days · 24-hour average
This week in Manassas
Over the past week, soil 2 inches down in Manassas, VA ranged from 52.3°F to 69.7°F and fell 11.3°F, averaging 63.2°F.
| Day | Surface | 2 in | 6 in |
|---|---|---|---|
| Mon | 64°F | 63.6°F | 62.6°F |
| Tue | 65.7°F | 64.1°F | 63.1°F |
| Wed | 72.3°F | 69.7°F | 66.8°F |
| Thu | 65.1°F | 67.1°F | 68.2°F |
| Fri | 68.3°F | 66.9°F | 65.7°F |
| Sat | 53.9°F | 58.8°F | 63.3°F |
| Sun | 48.7°F | 52.3°F | 56.7°F |
Daily averages from Open-Meteo for Manassas, VA 20110. Readings refresh every six hours.
Interpretation
What this means for your grass.
- Bermuda
- Bermuda is dormant for the winter. No fertilizer, no PGR. Winter weeds are already up by now, so treat what you can actually see rather than applying a pre-emergent.
- Zoysia
- Zoysia is dormant or nearly so. Hold all fertilizer and PGR. Winter weeds have already germinated, so treat what is visible instead of applying a pre-emergent.
- St. Augustine
- St. Augustine is slowing toward winter. Hold nitrogen. Winter weeds are already up, so treat what you can see rather than applying a pre-emergent now.
- Cool-season
- The best growing range of the year for cool-season grass. This is prime time to fertilize and to overseed. If you are overseeding, do not apply pre-emergent: it stops grass seed the same way it stops weed seed.
Nearest readings
Soil temperature near Manassas
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Weather data from Open-Meteo. Timing guidance follows the sources on when to apply pre-emergent and how to use soil temperature.Data as of Sun, 18 Oct 2026 08:18:25 GMT