Live soil temperature · 2 inches down
Soil temperature in Harrisburg, PA
Right now · 17101
58.3°FCool
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
- 58.6°F
- 2 in depth
- 58.3°F
- 6 in depth
- 59.3°F
Past 14 days · 24-hour average
This week in Harrisburg
Over the past week, soil 2 inches down in Harrisburg, PA ranged from 55.7°F to 62.1°F and fell 3.8°F, averaging 58.6°F.
| Day | Surface | 2 in | 6 in |
|---|---|---|---|
| Mon | 61.7°F | 62.1°F | 62.7°F |
| Tue | 55.6°F | 57.2°F | 60.5°F |
| Wed | 56.4°F | 55.7°F | 57.7°F |
| Thu | 61.6°F | 61.1°F | 60.7°F |
| Fri | 58.2°F | 58.6°F | 60.4°F |
| Sat | 57.7°F | 57.1°F | 58.8°F |
| Sun | 58.3°F | 58.3°F | 59.7°F |
Daily averages from Open-Meteo for Harrisburg, PA 17101. Readings refresh every six hours.
Interpretation
What this means for your grass.
- Bermuda
- Bermuda's growth is slowing toward dormancy. Stop pushing nitrogen. Soil is already below the 70°F annual bluegrass germination point, so fall pre-emergent is late, but it still blocks the seed that germinates over the next couple of months.
- Zoysia
- Zoysia is slowing toward dormancy. Stop nitrogen. Soil is below the 70°F annual bluegrass germination point, so fall pre-emergent is late but still worth putting down for later-germinating seed.
- 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 Harrisburg
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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 Mon, 12 Oct 2026 00:07:29 GMT