Soil temperature in Halifax, Nova Scotia

Soil temperature

17.7°C64°F

at 6cm — germination depth

Cooling over the next 11 days.

Seeding conditions are open — soil is 17.7°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.

Soil temperature at 6cm for reliable germination. Sources onthe method page.
SpeciesSoil tempDays
Perennial ryegrass8°C5–10
Red / chewings fescue8–10°C10–14
Tall fescuelikely yours10–12°C10–14
Browntop bentColonial bentgrass10–12°C14–21
Smooth-stalked meadow grassKentucky bluegrasslikely yours12–13°C14–28

Soil temperature at 6cm in Halifax, Nova Scotia is currently 17.7°C, and falling about 17.0°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. Seeding conditions are open — soil is 17.7°C at 6cm and holding above 12.5°C.

6 of the next 10 days look workable. The best weekend slot right now is Saturday 2pm–8pm, on the basis that dried off since a shower 1 hour ago, ground firm.

The next recommended window in Halifax opens at 8am on Wednesday 2 September, because that is when the dew has burnt off — earlier than that and you are cutting wet grass. Underfoot, the ground reads as firm after 1mm rain over the last week.

See the full mowing forecast for Halifax

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 17.2°C cooling to 0.0°C

Tuesday 1 September: Not worth it. No — nothing quite good enough today.

Tuesday 1 SeptemberConfident

No — nothing quite good enough today.

Good:Grass wetness
Grass dryno rain since Monday
Good:Ground firmness
Ground firm1mm rain over the last week
Good:Growth
Growing wellgrowth potential 0.92
Good:Temperature
Temperature18°C
Good:Wind
Wind light7 km/h

Limiting factor:none

Wednesday 2 September: Good. 8am–8pm — grass dry — no rain since Monday

Wednesday 2 September · 8am–8pmConfident

8am–8pm — grass dry — no rain since Monday

Good:Grass wetness
Grass dryno rain since Monday
Good:Ground firmness
Ground firm1mm rain over the last week
Good:Growth
Growing wellgrowth potential 0.83
Good:Temperature
Temperature12°C
Good:Wind
Wind light3 km/h
Sociable hours
A bit early or late, but finestarts once the dew has burnt off

Limiting factor:grass wetness

Thursday 3 September: Good. 8am–1pm — no rain since Monday, ground firm

Thursday 3 September · 8am–1pmConfident

8am–1pm — no rain since Monday, ground firm

Good:Grass wetness
Grass dryno rain since Monday
Good:Ground firmness
Ground firm1mm rain over the last week
Good:Growth
Growing wellgrowth potential 0.80
Good:Temperature
Temperature14°C
Good:Wind
Wind light10 km/h
Sociable hours
A bit early or late, but finestarts when it stops being antisocial

Limiting factor:none

Friday 4 September: Good. 7pm–8pm — dried off since a shower 1 hour ago, ground firm

Friday 4 September · 7pm–8pmConfident

7pm–8pm — dried off since a shower 1 hour ago, ground firm

Poor:Grass wetness
Grass drydried off since a shower 3 hours ago
Good:Ground firmness
Ground firm3mm rain over the last week
Good:Growth
Growing wellgrowth potential 0.99
Good:Temperature
Temperature17°C
Good:Wind
Wind light20 km/h
Sociable hours
A bit early or late, but finestarts once the rain has passed

Limiting factor:none

Saturday 5 September: Good. 2pm–8pm — dried off since a shower 1 hour ago, ground firm

Saturday 5 September · 2pm–8pmReasonably confident

2pm–8pm — dried off since a shower 1 hour ago, ground firm

Good:Grass wetness
Grass dryrain earlier today
Good:Ground firmness
Ground firm26mm rain over the last week
Good:Growth
Growing wellgrowth potential 0.81
Good:Temperature
Temperature15°C
Good:Wind
Wind light7 km/h
Sociable hours
Fine by the neighboursstarts once the rain has passed

Limiting factor:none

Sunday 6 September: Marginal. No — 0.1mm of rain falling.

Sunday 6 SeptemberReasonably confident

No — 0.1mm of rain falling.

Poor:Grass wetness
Grass wetrain 4 hours ago
Good:Ground firmness
Ground firm26mm rain over the last week
Good:Growth
Growing wellgrowth potential 0.63
Good:Temperature
Temperature14°C
Good:Wind
Wind light21 km/h

Limiting factor:grass wetness

Monday 7 September: Good. midday–8pm — rain earlier today, ground firm

Monday 7 September · midday–8pmReasonably confident

midday–8pm — rain earlier today, ground firm

Marginal:Grass wetness
Grass dryrain earlier today
Good:Ground firmness
Ground firm32mm rain over the last week
Good:Growth
Growing wellgrowth potential 0.71
Good:Temperature
Temperature14°C
Good:Wind
Wind light17 km/h
Sociable hours
Fine by the neighboursstarts once the dew has burnt off

Limiting factor:none

Tuesday 8 September: Good. 4pm–8pm — dried off since a shower 1 hour ago, ground firm

Tuesday 8 September · 4pm–8pmReasonably confident

4pm–8pm — dried off since a shower 1 hour ago, ground firm

Good:Grass wetness
Grass dryno rain since Monday
Good:Ground firmness
Ground firm32mm rain over the last week
Good:Growth
Growing wellgrowth potential 0.51
Good:Temperature
Temperature10°C
Good:Wind
Wind light6 km/h
Sociable hours
Fine by the neighboursstarts once the rain has passed

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 dryrain earlier today
Good:Ground firmness
Ground firm32mm rain over the last week
Good:Growth
Growing steadilygrowth potential 0.46
Good:Temperature
Temperature12°C
Good:Wind
Wind light7 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 dryno rain since Tuesday
Good:Ground firmness
Ground firm32mm rain over the last week
Poor:Growth
Barely growinggrowth potential 0.14
Good:Temperature
Temperature11°C
Good:Wind
Wind light4 km/h

Limiting factor:growth

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