Soil temperature in Oshawa, Ontario
Soil temperature
22.4°C72°F
at 6cm — germination depth
Cooling over the next 11 days.
Seeding conditions are open — soil is 22.4°C at 6cm and holding above 12.5°C.
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 Oshawa, Ontario is currently 22.4°C, and falling about 21.8°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. Seeding conditions are open — soil is 22.4°C at 6cm and holding above 12.5°C.
6 of the next 10 days look workable. The other 4 are held back by wet grass or soft ground. The best weekend slot right now is Sunday 10am–8pm, on the basis that no rain since Wednesday, ground firm.
The next recommended window in Oshawa opens at midday on Thursday 3 September, because that is when the dew has burnt off — earlier than that and you are cutting wet grass. Underfoot, the ground reads as soft in places after 45mm 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 21.8°C cooling to 0.0°C
Tuesday 1 September: Not worth it. No — grass wet, dew forming, rain earlier today.
Tuesday 1 SeptemberConfident
No — grass wet, dew forming, rain earlier today.
- Poor:Grass wetness
- Grass wetdew forming, rain earlier today
- Marginal:Ground firmness
- Ground soft in places45mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.99
- Good:Temperature
- Temperature20°C
- Good:Wind
- Wind light5 km/h
Limiting factor:grass wetness
Wednesday 2 September: Marginal. No — 0.4mm of rain falling.
Wednesday 2 SeptemberConfident
No — 0.4mm of rain falling.
- Poor:Grass wetness
- Grass wetrain earlier today
- Poor:Ground firmness
- Ground soft46mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.98
- Good:Temperature
- Temperature21°C
- Good:Wind
- Wind light13 km/h
Limiting factor:grass wetness
Thursday 3 September: Good. midday–8pm — ground soft — 61mm rain over the last week
Thursday 3 September · midday–8pmConfident
midday–8pm — ground soft — 61mm rain over the last week
- Marginal:Grass wetness
- Grass dryrain earlier today
- Marginal:Ground firmness
- Ground soft61mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.96
- Good:Temperature
- Temperature17°C
- Good:Wind
- Wind light6 km/h
- Sociable hours
- Fine by the neighboursstarts once the dew has burnt off
Limiting factor:ground firmness
Friday 4 September: Good. 8am–8pm — ground soft in places — 61mm rain over the last week
Friday 4 September · 8am–8pmConfident
8am–8pm — ground soft in places — 61mm rain over the last week
- Good:Grass wetness
- Grass dryno rain since Wednesday
- Marginal:Ground firmness
- Ground soft in places61mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.99
- Good:Temperature
- Temperature16°C
- Good:Wind
- Wind light10 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:ground firmness
Saturday 5 September: Good. 8am–8pm — no rain since Wednesday, ground soft in places
Saturday 5 September · 8am–8pmReasonably confident
8am–8pm — no rain since Wednesday, ground soft in places
- Good:Grass wetness
- Grass dryno rain since Wednesday
- Good:Ground firmness
- Ground soft in places61mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.94
- Good:Temperature
- Temperature14°C
- Good:Wind
- Wind light14 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Sunday 6 September: Good. 10am–8pm — no rain since Wednesday, ground firm
Sunday 6 September · 10am–8pmReasonably confident
10am–8pm — no rain since Wednesday, ground firm
- Good:Grass wetness
- Grass dryno rain since Wednesday
- Good:Ground firmness
- Ground firm61mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.89
- Good:Temperature
- Temperature14°C
- Good:Wind
- Wind light8 km/h
- Sociable hours
- Fine by the neighboursstarts when it stops being antisocial
Limiting factor:none
Monday 7 September: Good. 8am–8pm — no rain since Wednesday, ground firm
Monday 7 September · 8am–8pmReasonably confident
8am–8pm — no rain since Wednesday, ground firm
- Good:Grass wetness
- Grass dryno rain since Wednesday
- Good:Ground firmness
- Ground firm61mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.93
- Good:Temperature
- Temperature15°C
- Good:Wind
- Wind light7 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Tuesday 8 September: Good. 8am–8pm — no rain since Wednesday, ground firm
Tuesday 8 September · 8am–8pmReasonably confident
8am–8pm — no rain since Wednesday, ground firm
- Good:Grass wetness
- Grass dryno rain since Wednesday
- Good:Ground firmness
- Ground firm16mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.83
- Good:Temperature
- Temperature17°C
- Good:Wind
- Wind light13 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
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 Wednesday
- Good:Ground firmness
- Ground firm15mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.56
- Good:Temperature
- Temperature10°C
- Good:Wind
- Wind light13 km/h
Limiting factor:none
Thursday 10 September: Not worth it. No — ground frozen.
Thursday 10 SeptemberLow confidence this far out
No — ground frozen.
- Poor:Grass wetness
- Grass wetraining now
- Good:Ground firmness
- Ground firm0mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.78
- Good:Temperature
- Temperature15°C
- Good:Wind
- Wind light6 km/h
Limiting factor:grass wetness
Nearby
Your own postcode
These are town-centre figures. Yours will differ a little.