Calgary, Alberta
Best weekend slot
Sunday 10am–9pm
Verdict: Good
growing slowly — growth potential 0.27
Next mow
Today 6pm–9pm
Verdict: Good
temperature — 22°C
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 24.0°C cooling to 0.0°C
Tuesday 1 September: Good. 6pm–9pm — temperature — 22°C
Tuesday 1 September · 6pm–9pmConfident
6pm–9pm — temperature — 22°C
- Good:Grass wetness
- Grass dryno rain in over a week
- Good:Ground firmness
- Ground firm0mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.84
- Good:Temperature
- Temperature22°C
- Good:Wind
- Wind light15 km/h
- Sociable hours
- A bit early or late, but fine
Limiting factor:temperature
Wednesday 2 September: Good. 8am–2pm — no rain in over a week, ground firm
Wednesday 2 September · 8am–2pmConfident
8am–2pm — no rain in over a week, ground firm
- Good:Grass wetness
- Grass dryno rain in over a week
- Good:Ground firmness
- Ground firm0mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.97
- Good:Temperature
- Temperature13°C
- Good:Wind
- Wind light2 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Thursday 3 September: Good. 8am–9pm — grass dry — rain earlier today
Thursday 3 September · 8am–9pmConfident
8am–9pm — grass dry — rain earlier today
- Good:Grass wetness
- Grass dryrain earlier today
- Good:Ground firmness
- Ground firm1mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.61
- Good:Temperature
- Temperature10°C
- Good:Wind
- Wind light4 km/h
- Sociable hours
- A bit early or late, but finestarts once the dew has burnt off
Limiting factor:grass wetness
Friday 4 September: Marginal. No — 0.6mm of rain falling.
Friday 4 SeptemberConfident
No — 0.6mm of rain falling.
- Poor:Grass wetness
- Grass dampraining now
- Good:Ground firmness
- Ground firm2mm rain over the last week
- Marginal:Growth
- Growing slowlygrowth potential 0.30
- Good:Temperature
- Temperature12°C
- Good:Wind
- Wind light9 km/h
Limiting factor:grass wetness
Saturday 5 September: Good. 5pm–8pm — ground soft — 14mm rain over the last week
Saturday 5 September · 5pm–8pmReasonably confident
5pm–8pm — ground soft — 14mm rain over the last week
- Marginal:Grass wetness
- Grass dryrain earlier today
- Poor:Ground firmness
- Ground soft14mm rain over the last week
- Poor:Growth
- Growing slowlygrowth potential 0.21
- Good:Temperature
- Temperature11°C
- Good:Wind
- Wind light6 km/h
- Sociable hours
- A bit early or late, but fine
Limiting factor:ground firmness
Sunday 6 September: Good. 10am–9pm — growing slowly — growth potential 0.27
Sunday 6 September · 10am–9pmReasonably confident
10am–9pm — growing slowly — growth potential 0.27
- Good:Grass wetness
- Grass dryno rain since Friday
- Good:Ground firmness
- Ground firm36mm rain over the last week
- Marginal:Growth
- Growing slowlygrowth potential 0.27
- Good:Temperature
- Temperature12°C
- Good:Wind
- Wind light7 km/h
- Sociable hours
- Fine by the neighboursstarts when it stops being antisocial
Limiting factor:growth
Monday 7 September: Good. 8am–1pm — no rain since Friday, ground firm
Monday 7 September · 8am–1pmReasonably confident
8am–1pm — no rain since Friday, ground firm
- Good:Grass wetness
- Grass dryno rain since Friday
- Good:Ground firmness
- Ground firm36mm rain over the last week
- Good:Growth
- Growing steadilygrowth potential 0.38
- Good:Temperature
- Temperature11°C
- Good:Wind
- Wind light4 km/h
- Sociable hours
- A bit early or late, but finestarts at first light
Limiting factor:none
Tuesday 8 September: Good. 8am–7pm — rain earlier today, ground firm
Tuesday 8 September · 8am–7pmReasonably confident
8am–7pm — rain earlier today, ground firm
- Good:Grass wetness
- Grass dryrain earlier today
- Good:Ground firmness
- Ground firm36mm rain over the last week
- Good:Growth
- Growing steadilygrowth potential 0.38
- Good:Temperature
- Temperature11°C
- Good:Wind
- Wind light7 km/h
- Sociable hours
- A bit early or late, but finestarts at first light
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 firm36mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.63
- Good:Temperature
- Temperature12°C
- Good:Wind
- Wind light4 km/h
Limiting factor:grass wetness
Thursday 10 September: Not worth it. No — ground frozen.
Thursday 10 SeptemberLow confidence this far out
No — ground frozen.
- Good:Grass wetness
- Grass dryno rain since Wednesday
- Good:Ground firmness
- Ground firm36mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.87
- Good:Temperature
- Temperature13°C
- Good:Wind
- Wind light8 km/h
Limiting factor:none
Soil temperature
24.9°C77°F
at 6cm — germination depth
Cooling over the next 11 days.
Too cold to seed — 24.9°C at 6cm and not warming.
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 |
What this means right now
Warning: Too cold to seed
Too cold to seed — 24.9°C at 6cm and not warming.
Forecast from Open-Meteo, refreshed hourly. Soil temperature is modelled, not measured — how that works and where the thresholds come from.