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.
Mowing
When you can next cut it, and the best slot this weekend.
Current conditions · 6am, this hour
Not now — it’s dark
- Grass
- dry
- Ground
- firm
- Rain
- 0% chance
- Temp
- 20°
- Wind
- 8 km/h
Forecast for this hour, not a measurement.
Best weekend slot
Saturday 7am–6pm
Verdict: Prime time, >95% chance at its best hour
dry since Wednesday by then, ground firm
Next mow
Today 7am–11am
Verdict: Prime time, >95% chance at its best hour
dry for over a week by then, ground firm
Forecast notices · next 3 days
- Warning: Heat stress. Today gets hot enough to stress the sward. Mow early or late, and raise the height.
- Worth watching: Ground too soft. Thursday: the rain has left the ground too soft to mow. A mower will mark it, and a ride-on will rut it. More
The next 10 days
Each row is a day, morning on the left. The more solid a block, the more of the forecast runs agree you can mow. Open a day for the hour-by-hour forecast behind it.
Tuesday 20 October: 4 hours worth using. 7am–11am — dry for over a week by then, ground firm
Tuesday 20 October, hour by hour 5am 6am 7am 8am 9am 10am 11am midday 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm Chance — — >95% >95% >95% >95% <5% <5% <5% <5% <5% <5% <5% — — — Verdict Already gone dark Prime time Prime time Prime time Prime time Forget it Forget it Forget it Forget it Forget it Forget it Forget it dark dark dark Rainchance · 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 1% 0% 4% Rainmm · — — — — — — — — — — — — — — — Grass · dry dry dry dry dry dry dry dry dry dry dry dry dry dry dry Ground · firm firm firm firm firm firm firm firm firm firm firm firm firm firm firm Temp · 20° 20° 23° 26° 28° 29° 32° 33° 33° 33° 33° 33° 30° 28° 27° Windkm/h · 8 8 6 7 11 8 10 10 15 12 9 5 4 7 5 Daylight · — ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — — Growth: growing steadily (growth potential 0.43). Enough to be worth cutting. Growth decides whether a cut is wanted, not how well it will go, so it is not one of the rows above and does not move the chances.
Tuesday 20 October · 7am–11amConfident
7am–11am — dry for over a week by then, ground firm
>95% prime time at its best hour, >95% that all 4 hours stay mowable. Every forecast run agrees.
Limiting factor:none
Wednesday 21 October: 2 hours worth using. 5pm–6pm — cool — 23°C
Loading the hour-by-hour forecast…
Growth: growing steadily (growth potential 0.36). Enough to be worth cutting. Growth decides whether a cut is wanted, not how well it will go, so it is not one of the rows above and does not move the chances.
Wednesday 21 October · best slot5pm–6pmReasonably confident
5pm–6pm — cool — 23°C
75% good to go at its best hour. About 1 run in 4 hit rain.
Also mowable today: 10am–11am (65%) — each at its best hour
Limiting factor:temperature
Thursday 22 October: no hours worth using. No — ground waterlogged.
Loading the hour-by-hour forecast…
Growth: growing steadily (growth potential 0.42). Enough to be worth cutting. Growth decides whether a cut is wanted, not how well it will go, so it is not one of the rows above and does not move the chances.
Thursday 22 OctoberConfident
No — ground waterlogged.
<5% forget it at its best hour. Almost every run found the ground too soft.
Limiting factor:ground firmness
Friday 23 October: 11 hours worth using. 7am–6pm — dry since Wednesday by then, ground firm
Loading the hour-by-hour forecast…
Growth: growing well (growth potential 0.59). Enough to be worth cutting. Growth decides whether a cut is wanted, not how well it will go, so it is not one of the rows above and does not move the chances.
Friday 23 October · 7am–6pmConfident
7am–6pm — dry since Wednesday by then, ground firm
>95% prime time at its best hour, 85% that all 11 hours stay mowable. Every forecast run agrees.
Limiting factor:none
Saturday 24 October: 11 hours worth using. 7am–6pm — dry since Wednesday by then, ground firm
Loading the hour-by-hour forecast…
Growth: growing well (growth potential 0.57). Enough to be worth cutting. Growth decides whether a cut is wanted, not how well it will go, so it is not one of the rows above and does not move the chances.
Saturday 24 October · 7am–6pmReasonably confident
7am–6pm — dry since Wednesday by then, ground firm
>95% prime time at its best hour, >95% that all 11 hours stay mowable. Every forecast run agrees.
Limiting factor:none
Sunday 25 October: 11 hours worth using. 7am–6pm — dry since Wednesday by then, ground firm
Loading the hour-by-hour forecast…
Growth: growing steadily (growth potential 0.49). Enough to be worth cutting. Growth decides whether a cut is wanted, not how well it will go, so it is not one of the rows above and does not move the chances.
Sunday 25 October · 7am–6pmReasonably confident
7am–6pm — dry since Wednesday by then, ground firm
>95% prime time at its best hour, >95% that all 11 hours stay mowable. Every forecast run agrees.
Limiting factor:none
Monday 26 October: 7 hours worth using. 7am–2pm — dry since Wednesday by then, ground firm
Loading the hour-by-hour forecast…
Growth: growing steadily (growth potential 0.42). Enough to be worth cutting. Growth decides whether a cut is wanted, not how well it will go, so it is not one of the rows above and does not move the chances.
Monday 26 October · 7am–2pmReasonably confident
7am–2pm — dry since Wednesday by then, ground firm
>95% prime time at its best hour, >95% that all 7 hours stay mowable. Every forecast run agrees.
Limiting factor:none
Tuesday 27 October: 5 hours worth using. 7am–midday — temperature — 23°C
Loading the hour-by-hour forecast…
Growth: growing steadily (growth potential 0.36). Enough to be worth cutting. Growth decides whether a cut is wanted, not how well it will go, so it is not one of the rows above and does not move the chances.
Tuesday 27 October · 7am–middayReasonably confident
7am–midday — temperature — 23°C
>95% prime time at its best hour, >95% that all 5 hours stay mowable. Every forecast run agrees.
Limiting factor:temperature
Wednesday 28 October: 11 hours worth using. 7am–6pm — dry since Wednesday by then, ground firm
Loading the hour-by-hour forecast…
Growth: growing well (growth potential 0.55). Enough to be worth cutting. Growth decides whether a cut is wanted, not how well it will go, so it is not one of the rows above and does not move the chances.
Wednesday 28 October · 7am–6pmLow confidence this far out
7am–6pm — dry since Wednesday by then, ground firm
>95% prime time at its best hour, 85% that all 11 hours stay mowable. Every forecast run agrees.
Limiting factor:none
Thursday 29 October: 9 hours worth using. 7am–4pm — dry for over a week by then, ground firm
Loading the hour-by-hour forecast…
Growth: growing steadily (growth potential 0.48). Enough to be worth cutting. Growth decides whether a cut is wanted, not how well it will go, so it is not one of the rows above and does not move the chances.
Thursday 29 October · 7am–4pmLow confidence this far out
7am–4pm — dry for over a week by then, ground firm
95% prime time at its best hour, 75% that all 9 hours stay mowable. A handful of runs hit rain.
Limiting factor:none
good to go touch and go dark, frost or snow already goneFainter means fewer forecast runs agree.
Chance is the share of 82 forecast runs — the same weather models re-run from slightly different starting conditions — in which you could have mowed that hour. The rows under it in each day's table are what those runs expect on average, which is why an hour can look reasonable line by line and still fall short: the chance only counts runs where everything came together at once. Hover any cell for what the runs that ruled it out hit.
Growth
How fast it is growing, and when it will need cutting again.
43%Growing steadily
Of the fastest this grass could grow. The turf-industry measure, from today's temperature and day length.
Roughly 2mm a day. A lawn cut today would be ready for another in a fortnight or so.
Held back by heat — 26°C is past the point where cool-season grass grows best.
- Over the next 10 days
- about 16mm of leaf
- Next cut due
- in a fortnight or so
This only knows temperature and day length. Feeding, watering, shade and cutting height all move it, so treat it as a rough guide.
Worked out from the PACE Turf growth potential model and day length —how and why.
Seeding
Soil temperature at germination depth, and when the window opens.
Soil temperature in Peoria, Arizona
72°F22.0°C
at 6cm — germination depth
Seeding conditions are open — soil is 22.0°C at 6cm and holding above 12.5°C.
Cooling over the next 10 days.
An independent estimate from air temperature gives 24.4°C, 2.4°C away. Treat the figure as approximate.
Most cool-season lawns in the northern US and Canada are bluegrass, tall fescue, or a mix of the two. We assume that, and use 12.5°C as the seeding threshold.
Thresholds for every species
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 needed | Days to sprout |
|---|---|---|
| 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.
Peoria, Arizona in detail
Soil temperature in Peoria, Arizona is currently 22.0°C at 6cm, and falling about 9.4°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. Seeding conditions are open — soil is 22.0°C at 6cm and holding above 12.5°C.
9 of the next 10 days are good mowing days. The other one is held back by wet grass or soft ground. The best weekend slot right now is Saturday 7am–6pm, on the basis that dry since Wednesday by then, ground firm.
The next recommended window in Peoria opens at 7am on Tuesday 20 October, because that is first light. Underfoot, the ground reads as firm after 0mm rain over the last week, coarse (sandy) soil.
Save this lawn and we will email you when the windows open.
We already send you the forecast email? Use the same address.
Chances counted across 82 forecast runs from NCEP GEFS, 25km and ECMWF IFS ensemble, 25km. Forecast from Open-Meteo, refreshed through the day. Soil temperature is modelled, not measured — how that works and where the thresholds come from.