Salt Lake City, Utah
Best weekend slot
Saturday 8am–midday
Verdict: Good
no rain since Monday, ground firm
Next mow
Today 6pm–8pm
Verdict: Good
heat stress — 27°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 25.9°C cooling to 0.0°C
Tuesday 1 September: Good. 6pm–8pm — heat stress — 27°C
Tuesday 1 September · 6pm–8pmConfident
6pm–8pm — heat stress — 27°C
- Good:Grass wetness
- Grass dryrain earlier today
- Good:Ground firmness
- Ground firm3mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 1.00
- Poor:Temperature
- Heat stress27°C
- Good:Wind
- Wind light18 km/h
- Sociable hours
- A bit early or late, but fine
Limiting factor:temperature
Wednesday 2 September: Good. 8am–2pm — no rain since Monday, ground firm
Wednesday 2 September · 8am–2pmConfident
8am–2pm — no rain since Monday, ground firm
- Good:Grass wetness
- Grass dryno rain since Monday
- Good:Ground firmness
- Ground firm4mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.82
- Marginal:Temperature
- Temperature17°C
- Good:Wind
- Wind light14 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
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 firm4mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.95
- Marginal:Temperature
- Temperature14°C
- Good:Wind
- Wind light8 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Friday 4 September: Good. 8am–1pm — no rain since Monday, ground firm
Friday 4 September · 8am–1pmConfident
8am–1pm — no rain since Monday, ground firm
- Good:Grass wetness
- Grass dryno rain since Monday
- Good:Ground firmness
- Ground firm4mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.59
- Marginal:Temperature
- Temperature20°C
- Good:Wind
- Wind light8 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Saturday 5 September: Good. 8am–midday — no rain since Monday, ground firm
Saturday 5 September · 8am–middayReasonably confident
8am–midday — no rain since Monday, ground firm
- Good:Grass wetness
- Grass dryno rain since Monday
- Good:Ground firmness
- Ground firm3mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.56
- Poor:Temperature
- Temperature20°C
- Good:Wind
- Wind light8 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Sunday 6 September: Good. midday–8pm — dried off since a shower 1 hour ago, ground firm
Sunday 6 September · midday–8pmReasonably confident
midday–8pm — dried off since a shower 1 hour ago, ground firm
- Good:Grass wetness
- Grass dryno rain since Monday
- Good:Ground firmness
- Ground firm2mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.63
- Marginal:Temperature
- Temperature20°C
- Good:Wind
- Wind light10 km/h
- Sociable hours
- Fine by the neighboursstarts once the rain has passed
Limiting factor:none
Monday 7 September: Good. 1pm–4pm — cool — 26°C
Monday 7 September · 1pm–4pmReasonably confident
1pm–4pm — cool — 26°C
- Marginal:Grass wetness
- Grass drydried off since a shower 0 hours ago
- Good:Ground firmness
- Ground firm3mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.83
- Good:Temperature
- Temperature19°C
- Good:Wind
- Wind light8 km/h
- Sociable hours
- Fine by the neighboursstarts once the rain has passed
Limiting factor:temperature
Tuesday 8 September: Not worth it. No — ground waterlogged.
Tuesday 8 SeptemberReasonably confident
No — ground waterlogged.
- Good:Grass wetness
- Grass drydried off since a shower 5 hours ago
- Marginal:Ground firmness
- Ground firm9mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.96
- Good:Temperature
- Temperature19°C
- Good:Wind
- Wind light12 km/h
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 Tuesday
- Good:Ground firmness
- Ground firm11mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.94
- Marginal:Temperature
- Temperature19°C
- Good:Wind
- Wind light1 km/h
Limiting factor:none
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 Tuesday
- Good:Ground firmness
- Ground firm11mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.88
- Good:Temperature
- Temperature19°C
- Good:Wind
- Wind light6 km/h
Limiting factor:none
Soil temperature
79°F26.0°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 |
What this means right now
Warning: Too warm to seed
Too warm to seed — the soil is heat-stressed. Wait for it to cool.
Warning: Heat stress
Tuesday 1 September gets hot enough to stress the sward. Mow early or late, and raise the height.
Forecast from Open-Meteo, refreshed hourly. Soil temperature is modelled, not measured — how that works and where the thresholds come from.