Soil temperature in Hagerstown, Maryland
Soil temperature
80°F26.6°C
at 6cm — germination depth
Cooling over the next 11 days.
Too warm to seed — the soil is heat-stressed. Wait for it to cool.
Most cool-season lawns in the northern US and Canada are bluegrass, tall fescue, or a mix of the two. We assume that, and use12.5°C as the seeding threshold.
I know what grass I have
The differences are small. Ryegrass is the quickest off the mark; bluegrass is the slowest and wants the warmest soil. Everything else sits between.
| Species | Soil temp | Days |
|---|---|---|
| Perennial ryegrass | 8°C | 5–10 |
| Red / chewings fescue | 8–10°C | 10–14 |
| Tall fescuelikely yours | 10–12°C | 10–14 |
| Browntop bentColonial bentgrass | 10–12°C | 14–21 |
| Smooth-stalked meadow grassKentucky bluegrasslikely yours | 12–13°C | 14–28 |
Soil temperature at 6cm in Hagerstown, Maryland is currently 26.6°C, and falling about 25.0°C over the next 11 days. That depth matters because it is where grass seed sits and where roots start working, and it lags air temperature by days — which is why a warm afternoon here tells you very little on its own.
Lawns in this area are typically Kentucky bluegrass with tall fescue, the usual mix for cool-season lawns at this latitude. That blend needs the soil to hold above 12.5°C before seed germinates reliably. Too warm to seed — the soil is heat-stressed. Wait for it to cool.
7 of the next 10 days are good mowing days. The other 3 are held back by wet grass or soft ground. The best weekend slot right now is Monday 10am–3pm, on the basis that ground soft — 104mm rain over the last week.
The next recommended window in Hagerstown opens at 3pm on Sunday 6 September, and holds while conditions stay put. Underfoot, the ground reads as firm after 0mm rain over the last week.
The next 10 days
Column height is how mowable the day is; the lighter band is the best stretch within it. The line is soil temperature at 6cm. It crosses the seeding threshold inside this forecast.
12.5°C — seeding
Soil at 6cm 26.0°C cooling to 0.0°C
Tuesday 1 September: Not worth it. No — heat stress, 29°C.
Tuesday 1 SeptemberConfident
No — heat stress, 29°C.
- Good:Grass wetness
- Grass dryno rain since Thursday
- Good:Ground firmness
- Ground firm0mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.54
- Poor:Temperature
- Heat stress27°C
- Good:Wind
- Wind light14 km/h
Limiting factor:temperature
Wednesday 2 September: Good. No — 100.1mm of rain falling.
Wednesday 2 SeptemberConfident
No — 100.1mm of rain falling.
- Marginal:Grass wetness
- Grass dryno rain since Thursday
- Poor:Ground firmness
- Ground soft0mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.56
- Marginal:Temperature
- Temperature22°C
- Good:Wind
- Wind light4 km/h
Limiting factor:ground firmness
Thursday 3 September: Good. No — ground saturated, 101mm rain over the last week.
Thursday 3 SeptemberConfident
No — ground saturated, 101mm rain over the last week.
- Good:Grass wetness
- Grass dryrain earlier today
- Poor:Ground firmness
- Ground soft101mm rain over the last week
- Good:Growth
- Growing steadilygrowth potential 0.41
- Poor:Temperature
- Temperature22°C
- Good:Wind
- Wind light5 km/h
Limiting factor:ground firmness
Friday 4 September: Good. No — 0.1mm of rain falling.
Friday 4 SeptemberConfident
No — 0.1mm of rain falling.
- Marginal:Grass wetness
- Grass drydried off since a shower 3 hours ago
- Poor:Ground firmness
- Ground soft100mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.51
- Marginal:Temperature
- Temperature22°C
- Good:Wind
- Wind light4 km/h
Limiting factor:ground firmness
Saturday 5 September: Good. No — ground soft, 104mm rain over the last week.
Saturday 5 SeptemberReasonably confident
No — ground soft, 104mm rain over the last week.
- Good:Grass wetness
- Grass dryrain earlier today
- Poor:Ground firmness
- Ground soft104mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.96
- Good:Temperature
- Temperature16°C
- Good:Wind
- Wind light8 km/h
Limiting factor:ground firmness
Sunday 6 September: Good. 3pm–8pm — ground soft — 104mm rain over the last week
Sunday 6 September · 3pm–8pmReasonably confident
3pm–8pm — ground soft — 104mm rain over the last week
- Good:Grass wetness
- Grass dryno rain since Friday
- Poor:Ground firmness
- Ground soft104mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.95
- Good:Temperature
- Temperature12°C
- Good:Wind
- Wind light10 km/h
- Sociable hours
- Fine by the neighbours
Limiting factor:ground firmness
Monday 7 September: Good. 10am–3pm — ground soft — 104mm rain over the last week
Monday 7 September · 10am–3pmReasonably confident
10am–3pm — ground soft — 104mm rain over the last week
- Good:Grass wetness
- Grass dryno rain since Friday
- Marginal:Ground firmness
- Ground soft104mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.97
- Marginal:Temperature
- Temperature15°C
- Good:Wind
- Wind light1 km/h
- Sociable hours
- Fine by the neighboursstarts when it stops being antisocial
Limiting factor:ground firmness
Tuesday 8 September: Good. 8am–1pm — ground soft in places — 104mm rain over the last week
Tuesday 8 September · 8am–1pmReasonably confident
8am–1pm — ground soft in places — 104mm rain over the last week
- Good:Grass wetness
- Grass dryno rain since Friday
- Marginal:Ground firmness
- Ground soft in places104mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.86
- Marginal:Temperature
- Temperature17°C
- Good:Wind
- Wind light9 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:ground firmness
Wednesday 9 September: Not worth it. No — ground frozen.
Wednesday 9 SeptemberLow confidence this far out
No — ground frozen.
- Good:Grass wetness
- Grass dryno rain since Friday
- Marginal:Ground firmness
- Ground soft in places104mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.96
- Good:Temperature
- Temperature20°C
- Good:Wind
- Wind light3 km/h
Limiting factor:ground firmness
Thursday 10 September: Not worth it. No — ground frozen.
Thursday 10 SeptemberLow confidence this far out
No — ground frozen.
- Good:Grass wetness
- Grass drydried off since a shower 0 hours ago
- Good:Ground firmness
- Ground soft in places5mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.69
- Poor:Temperature
- Temperature21°C
- Good:Wind
- Wind light17 km/h
Limiting factor:grass wetness
Nearby
Your own postcode
These are town-centre figures. Yours will differ a little.