Peoria, Arizona
You are in the transition zone, where cool- and warm-season lawns both grow. These answers assume a cool-season lawn — ryegrass, fescue or bluegrass.
Best weekend slot
Nothing doing
Verdict: Not worth it
conditions never quite get there. And nothing else in the next 10 days either.
Next mow
Not in the next 10 days
Verdict: Not worth it
ground frozen.
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 39.5°C cooling to 0.0°C
Tuesday 1 September: Good. No — barely growing, growth potential 0.18.
Tuesday 1 SeptemberConfident
No — barely growing, growth potential 0.18.
- Good:Grass wetness
- Grass dryno rain since Monday
- Good:Ground firmness
- Ground firm10mm rain over the last week
- Poor:Growth
- Barely growinggrowth potential 0.18
- Poor:Temperature
- Heat stress37°C
- Good:Wind
- Wind light9 km/h
Limiting factor:growth
Wednesday 2 September: Good. No — barely growing, growth potential 0.09.
Wednesday 2 SeptemberConfident
No — barely growing, growth potential 0.09.
- Good:Grass wetness
- Grass dryno rain since Monday
- Good:Ground firmness
- Ground firm10mm rain over the last week
- Poor:Growth
- Barely growinggrowth potential 0.09
- Poor:Temperature
- Heat stress27°C
- Good:Wind
- Wind light4 km/h
Limiting factor:growth
Thursday 3 September: Good. No — barely growing, growth potential 0.09.
Thursday 3 SeptemberConfident
No — barely growing, growth potential 0.09.
- Good:Grass wetness
- Grass dryno rain since Monday
- Good:Ground firmness
- Ground firm10mm rain over the last week
- Poor:Growth
- Barely growinggrowth potential 0.09
- Poor:Temperature
- Cool26°C
- Good:Wind
- Wind light4 km/h
Limiting factor:growth
Friday 4 September: Good. No — barely growing, growth potential 0.03.
Friday 4 SeptemberConfident
No — barely growing, growth potential 0.03.
- Good:Grass wetness
- Grass drydried off since a shower 4 hours ago
- Good:Ground firmness
- Ground firm10mm rain over the last week
- Poor:Growth
- Barely growinggrowth potential 0.03
- Poor:Temperature
- Heat stress30°C
- Good:Wind
- Wind light15 km/h
Limiting factor:growth
Saturday 5 September: Good. No — 0.2mm of rain falling.
Saturday 5 SeptemberReasonably confident
No — 0.2mm of rain falling.
- Good:Grass wetness
- Grass dryno rain since Friday
- Good:Ground firmness
- Ground firm11mm rain over the last week
- Poor:Growth
- Barely growinggrowth potential 0.03
- Poor:Temperature
- Heat stress32°C
- Good:Wind
- Wind light8 km/h
Limiting factor:growth
Sunday 6 September: Good. No — barely growing, growth potential 0.03.
Sunday 6 SeptemberReasonably confident
No — barely growing, growth potential 0.03.
- Good:Grass wetness
- Grass dryrain earlier today
- Good:Ground firmness
- Ground firm11mm rain over the last week
- Poor:Growth
- Barely growinggrowth potential 0.03
- Poor:Temperature
- Heat stress31°C
- Good:Wind
- Wind light8 km/h
Limiting factor:growth
Monday 7 September: Good. No — barely growing, growth potential 0.01.
Monday 7 SeptemberReasonably confident
No — barely growing, growth potential 0.01.
- Good:Grass wetness
- Grass dryno rain since Sunday
- Good:Ground firmness
- Ground firm13mm rain over the last week
- Poor:Growth
- Barely growinggrowth potential 0.01
- Poor:Temperature
- Heat stress34°C
- Good:Wind
- Wind light6 km/h
Limiting factor:growth
Tuesday 8 September: Good. No — ground frozen.
Tuesday 8 SeptemberReasonably confident
No — ground frozen.
- Good:Grass wetness
- Grass dryno rain since Sunday
- Good:Ground firmness
- Ground firm3mm rain over the last week
- Poor:Growth
- Barely growinggrowth potential 0.01
- Poor:Temperature
- Heat stress34°C
- Good:Wind
- Wind light9 km/h
Limiting factor:growth
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 Sunday
- Good:Ground firmness
- Ground firm3mm rain over the last week
- Poor:Growth
- Barely growinggrowth potential 0.02
- Poor:Temperature
- Heat stress31°C
- Good:Wind
- Wind light14 km/h
Limiting factor:growth
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 5 hours ago
- Good:Ground firmness
- Ground firm3mm rain over the last week
- Poor:Growth
- Barely growinggrowth potential 0.08
- Poor:Temperature
- Heat stress29°C
- Good:Wind
- Wind light4 km/h
Limiting factor:growth
Soil temperature
104°F40.1°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.
Worth watching: Growth has stalled
The lawn is hard and barely growing. Cutting it now takes more than it gives — leave it longer and wait for rain.
Forecast from Open-Meteo, refreshed hourly. Soil temperature is modelled, not measured — how that works and where the thresholds come from.