Soil temperature in Norwalk, California
Soil temperature
86°F29.8°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 |
Soil temperature at 6cm in Norwalk, California is currently 29.8°C, and falling about 26.5°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. Too warm to seed — the soil is heat-stressed. Wait for it to cool.
8 of the next 10 days are good mowing days. The best weekend slot right now is Saturday 8am–1pm, on the basis that no rain in the record, ground firm.
The next recommended window in Norwalk opens at 6pm on Tuesday 1 September, and holds while conditions stay put. Underfoot, the ground reads as firm after 0mm 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 28.9°C cooling to 0.0°C
Tuesday 1 September: Good. 6pm–8pm — temperature — 23°C
Tuesday 1 September · 6pm–8pmConfident
6pm–8pm — temperature — 23°C
- Good:Grass wetness
- Grass dryno rain in the record
- Good:Ground firmness
- Ground firm0mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.81
- Good:Temperature
- Temperature23°C
- Good:Wind
- Wind light14 km/h
- Sociable hours
- A bit early or late, but fine
Limiting factor:temperature
Wednesday 2 September: Good. 8am–2pm — no rain in the record, ground firm
Wednesday 2 September · 8am–2pmConfident
8am–2pm — no rain in the record, ground firm
- Good:Grass wetness
- Grass dryno rain in the record
- Good:Ground firmness
- Ground firm0mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.94
- Marginal:Temperature
- Temperature15°C
- Good:Wind
- Wind light4 km/h
- Sociable hours
- A bit early or late, but finestarts once the dew has burnt off
Limiting factor:none
Thursday 3 September: Good. 8am–8pm — no rain in the record, ground firm
Thursday 3 September · 8am–8pmConfident
8am–8pm — no rain in the record, ground firm
- Good:Grass wetness
- Grass dryno rain in the record
- Good:Ground firmness
- Ground firm0mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.95
- Marginal:Temperature
- Temperature16°C
- Good:Wind
- Wind light5 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Friday 4 September: Good. 8am–8pm — no rain in the record, ground firm
Friday 4 September · 8am–8pmConfident
8am–8pm — no rain in the record, ground firm
- Good:Grass wetness
- Grass dryno rain in the record
- Good:Ground firmness
- Ground firm0mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.75
- Marginal:Temperature
- Temperature21°C
- Good:Wind
- Wind light10 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Saturday 5 September: Good. 8am–1pm — no rain in the record, ground firm
Saturday 5 September · 8am–1pmReasonably confident
8am–1pm — no rain in the record, ground firm
- Good:Grass wetness
- Grass dryno rain in the record
- Good:Ground firmness
- Ground firm0mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.65
- Marginal:Temperature
- Temperature22°C
- Good:Wind
- Wind light5 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Sunday 6 September: Good. 10am–midday — heat stress — 28°C
Sunday 6 September · 10am–middayReasonably confident
10am–midday — heat stress — 28°C
- Good:Grass wetness
- Grass drydried off since a shower 0 hours ago
- Good:Ground firmness
- Ground firm0mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.54
- Poor:Temperature
- Cool25°C
- Good:Wind
- Wind light3 km/h
- Sociable hours
- Fine by the neighboursstarts when it stops being antisocial
Limiting factor:temperature
Monday 7 September: Good. 5pm–8pm — heat stress — 28°C
Monday 7 September · 5pm–8pmReasonably confident
5pm–8pm — heat stress — 28°C
- Good:Grass wetness
- Grass drydried off since a shower 0 hours ago
- Good:Ground firmness
- Ground firm1mm rain over the last week
- Marginal:Growth
- Growing slowlygrowth potential 0.34
- Poor:Temperature
- Cool26°C
- Good:Wind
- Wind light2 km/h
- Sociable hours
- A bit early or late, but fine
Limiting factor:temperature
Tuesday 8 September: Good. 8am–10am — growing slowly — growth potential 0.31
Tuesday 8 September · 8am–10amReasonably confident
8am–10am — growing slowly — growth potential 0.31
- Good:Grass wetness
- Grass dryrain earlier today
- Good:Ground firmness
- Ground firm3mm rain over the last week
- Marginal:Growth
- Growing slowlygrowth potential 0.31
- Poor:Temperature
- Heat stress26°C
- Good:Wind
- Wind light3 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
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 Monday
- Good:Ground firmness
- Ground firm3mm rain over the last week
- Marginal:Growth
- Growing slowlygrowth potential 0.24
- Poor:Temperature
- Cool26°C
- Good:Wind
- Wind light8 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 dryno rain since Monday
- Good:Ground firmness
- Ground firm3mm rain over the last week
- Marginal:Growth
- Growing slowlygrowth potential 0.29
- Poor:Temperature
- Cool25°C
- Good:Wind
- Wind light8 km/h
Limiting factor:growth
Nearby
Your own postcode
These are town-centre figures. Yours will differ a little.