Lancaster, California
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.
Mowing
When you can next cut it, and the best slot this weekend.
Best weekend slot
Saturday 8am–1pm
Verdict: Good
no rain in the record, ground firm
Next mow
Today 7pm–8pm
Verdict: Good
no rain in the record, ground firm
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 28.2°C cooling to 0.0°C
Wednesday 2 September: Good. 7pm–8pm — no rain in the record, ground firm
Wednesday 2 September · 7pm–8pmConfident
7pm–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 0.90
- Good:Temperature
- Cool24°C
- Good:Wind
- Wind light20 km/h
- Sociable hours
- A bit early or late, but fine
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 0.91
- 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
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 0.97
- Good:Temperature
- Temperature15°C
- Good:Wind
- Wind light11 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–1pmConfident
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 0.95
- Marginal:Temperature
- Temperature15°C
- Good:Wind
- Wind light11 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 — cool — 25°C
Sunday 6 September · 10am–middayReasonably confident
10am–midday — cool — 25°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 0.91
- Marginal:Temperature
- Temperature16°C
- Marginal:Wind
- Wind light11 km/h
- Sociable hours
- Fine by the neighboursstarts when it stops being antisocial
Limiting factor:temperature
Monday 7 September: Good. 10am–midday — cool — 25°C
Monday 7 September · 10am–middayReasonably confident
10am–midday — cool — 25°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 0.90
- Marginal:Temperature
- Temperature15°C
- Good:Wind
- Wind light16 km/h
- Sociable hours
- Fine by the neighboursstarts when it stops being antisocial
Limiting factor:temperature
Tuesday 8 September: Good. 8am–midday — no rain in the record, ground firm
Tuesday 8 September · 8am–middayReasonably confident
8am–midday — 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 0.83
- Marginal:Temperature
- Temperature18°C
- Good:Wind
- Wind light10 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Wednesday 9 September: Good. 8am–1pm — no rain in the record, ground firm
Wednesday 9 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 0.90
- Marginal:Temperature
- Temperature16°C
- Marginal:Wind
- Wind light14 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:temperature
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 in the record
- Good:Ground firmness
- Ground firm0mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.93
- Good:Temperature
- Temperature14°C
- Marginal:Wind
- Wind light18 km/h
Limiting factor:none
Friday 11 September: Not worth it. No — ground frozen.
Friday 11 SeptemberLow confidence this far out
No — ground frozen.
- Good:Grass wetness
- Grass dryno rain in the record
- Good:Ground firmness
- Ground firm0mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.93
- Good:Temperature
- Temperature14°C
- Good:Wind
- Wind light17 km/h
Limiting factor:none
Growth
How fast it is growing, and when it will need cutting again.
0.90Growing strongly
Growth potential, 0 to 1 — the turf-industry measure of how fast grass can grow at today's temperature and day length.
Putting on about 5.4mm a day. A lawn cut today would be ready for another in around 3 days.
Worked out from the PACE Turf growth potential model and day length —how and why.
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
Thursday 3 September gets hot enough to stress the sward. Mow early or late, and raise the height.
Worth watching: Worth knowing
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.
Seeding
Soil temperature at germination depth, and when the window opens.
Soil temperature
83°F28.2°C
at 6cm — germination depth
Cooling over the next 10 days.
Too warm to seed — the soil is heat-stressed. Wait for it to cool.
Cross-checks against an independent estimate from air temperature (24.8°C), which agrees to within 0.7°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.
| 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 |
Feeding
Why timing decides whether a feed does anything at all.
Coming in the app
Grass takes up nitrogen when it is growing. Feed a lawn that has stopped and most of it washes past the roots — which is why timing beats product choice.
Right now this lawn is growing well enough to use a feed.
The app will work out the actual feeding windows for your lawn — along with weed control, scarifying and moss treatment — and tell you when they open without you having to check.
Lancaster, California in detail
Soil temperature at 6cm in Lancaster, California is currently 28.2°C, and falling about 25.5°C over the next 10 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 Lancaster opens at 7pm on Wednesday 2 September, and holds while conditions stay put. Underfoot, the ground reads as firm after 0mm rain over the last week.
Forecast from Open-Meteo, refreshed hourly. Soil temperature is modelled, not measured — how that works and where the thresholds come from.