Green Bay, Wisconsin
Mowing
When you can next cut it, and the best slot this weekend.
Current conditions · 8am, this hour
Nothing to cut
- Grass
- damp
- Ground
- bog
- Rain
- 0% chance
- Temp
- 6°
- Wind
- 4 km/h
Forecast for this hour, not a measurement.
Best weekend slot
Saturday 8am–6pm
Verdict: Prime time, >95% chance at its best hour
dry for over a week by then, ground firm
Next mow
Tomorrow midday–6pm
Verdict: Prime time, >95% chance at its best hour
ground firm — 16mm rain over the last week, coarse (sandy) soil
Forecast notices · next 3 days
- Worth watching: Ground too soft. Today: 16mm of rain over the past week 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: nothing to cut. Nothing to cut — the grass is barely growing (growth potential 0.06).
Tuesday 20 October, hour by hour 5am 6am 7am 8am 9am 10am 11am midday 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm Chance — — — <5% <5% <5% <5% <5% <5% <5% <5% <5% <5% — — — Verdict Already gone Already gone Already gone nothing to cut — the grass is barely growing nothing to cut — the grass is barely growing nothing to cut — the grass is barely growing nothing to cut — the grass is barely growing nothing to cut — the grass is barely growing nothing to cut — the grass is barely growing nothing to cut — the grass is barely growing nothing to cut — the grass is barely growing nothing to cut — the grass is barely growing nothing to cut — the grass is barely growing nothing to cut — the grass is barely growing nothing to cut — the grass is barely growing nothing to cut — the grass is barely growing Rainchance · · · 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% Rainmm · · · — — — — — — — — — — — — — Grass · · · damp damp dry dry dry dry dry dry dry dry dry dry dry Ground · · · bog bog bog bog bog bog bog bog bog bog bog bog bog Temp · · · 6° 7° 7° 8° 9° 10° 11° 12° 12° 12° 10° 9° 8° Windkm/h · · · 4 4 2 1 2 3 3 4 5 6 8 7 8 Daylight · · · ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — — Growth: barely growing (growth potential 0.06). Not enough to be worth cutting, which is why no hour is recommended today whatever the weather does.
Tuesday 20 OctoberConfident
Nothing to cut — the grass is barely growing (growth potential 0.06).
<5% nothing to cut at its best hour. Almost every run found the grass barely growing.
Nothing to cut. The odds below describe the weather only — growth decides whether a cut is wanted, and it is judged separately.
Limiting factor:growth
Wednesday 21 October: 6 hours worth using. Midday–6pm — ground firm — 16mm rain over the last week, coarse (sandy) soil
Loading the hour-by-hour forecast…
Growth: barely growing (growth potential 0.12). 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 · midday–6pmConfident
Midday–6pm — ground firm — 16mm rain over the last week, coarse (sandy) soil
>95% prime time at its best hour, >95% that all 6 hours stay mowable. Every forecast run agrees.
Limiting factor:ground firmness
Thursday 22 October: 10 hours worth using. 8am–6pm — grass dry — dry since Friday by then
Loading the hour-by-hour forecast…
Growth: growing slowly (growth potential 0.32). 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 October · 8am–6pmConfident
8am–6pm — grass dry — dry since Friday by then
>95% prime time at its best hour, >95% that all 10 hours stay mowable. Every forecast run agrees.
Limiting factor:grass wetness
Friday 23 October: 10 hours worth using. 8am–6pm — ground firm — 4mm rain over the last week, coarse (sandy) soil
Loading the hour-by-hour forecast…
Growth: growing steadily (growth potential 0.37). 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 · 8am–6pmConfident
8am–6pm — ground firm — 4mm rain over the last week, coarse (sandy) soil
>95% prime time at its best hour, 95% that all 10 hours stay mowable. Every forecast run agrees.
Limiting factor:ground firmness
Saturday 24 October: 10 hours worth using. 8am–6pm — dry for over a week by then, ground firm
Loading the hour-by-hour forecast…
Growth: growing well (growth potential 0.50). 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 · 8am–6pmReasonably confident
8am–6pm — dry for over a week by then, ground firm
>95% prime time at its best hour, >95% that all 10 hours stay mowable. Every forecast run agrees.
Limiting factor:none
Sunday 25 October: 10 hours worth using. 8am–6pm — dry for over a week by then, ground firm
Loading the hour-by-hour forecast…
Growth: growing steadily (growth potential 0.50). 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 · 8am–6pmReasonably confident
8am–6pm — dry for over a week by then, ground firm
>95% prime time at its best hour, 55% that all 10 hours stay mowable. Every forecast run agrees.
Limiting factor:none
Monday 26 October: nothing to cut. Nothing to cut — the grass is barely growing (growth potential 0.03).
Loading the hour-by-hour forecast…
Growth: barely growing (growth potential 0.03). Not enough to be worth cutting, which is why no hour is recommended today whatever the weather does.
Monday 26 OctoberReasonably confident
Nothing to cut — the grass is barely growing (growth potential 0.03).
75% nothing to cut at its best hour. About 1 run in 4 found the grass barely growing.
Nothing to cut. The odds below describe the weather only — growth decides whether a cut is wanted, and it is judged separately.
Limiting factor:growth
Tuesday 27 October: nothing to cut. Nothing to cut — the grass is barely growing (growth potential 0.00).
Loading the hour-by-hour forecast…
Growth: barely growing (growth potential 0.00). Not enough to be worth cutting, which is why no hour is recommended today whatever the weather does.
Tuesday 27 OctoberReasonably confident
Nothing to cut — the grass is barely growing (growth potential 0.00).
95% nothing to cut at its best hour. A handful of runs found the grass barely growing.
Nothing to cut. The odds below describe the weather only — growth decides whether a cut is wanted, and it is judged separately.
Limiting factor:growth
Wednesday 28 October: nothing to cut. Nothing to cut — the grass is barely growing (growth potential 0.00). Conditions themselves are fine.
Loading the hour-by-hour forecast…
Growth: barely growing (growth potential 0.00). Not enough to be worth cutting, which is why no hour is recommended today whatever the weather does.
Wednesday 28 OctoberLow confidence this far out
Nothing to cut — the grass is barely growing (growth potential 0.00). Conditions themselves are fine.
>95% nothing to cut at its best hour. Every forecast run agrees.
Nothing to cut. The odds below describe the weather only — growth decides whether a cut is wanted, and it is judged separately.
Limiting factor:growth
Thursday 29 October: nothing to cut. Nothing to cut — the grass is barely growing (growth potential 0.01). Conditions themselves are fine.
Loading the hour-by-hour forecast…
Growth: barely growing (growth potential 0.01). Not enough to be worth cutting, which is why no hour is recommended today whatever the weather does.
Thursday 29 OctoberLow confidence this far out
Nothing to cut — the grass is barely growing (growth potential 0.01). Conditions themselves are fine.
>95% nothing to cut at its best hour. Every forecast run agrees.
Nothing to cut. The odds below describe the weather only — growth decides whether a cut is wanted, and it is judged separately.
Limiting factor:growth
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.
6%Barely growing
Of the fastest this grass could grow. The turf-industry measure, from today's temperature and day length.
The lawn is barely growing, so it does not need cutting. Leave it — taking leaf off a sward that cannot replace it costs more than it gives.
Held back by both temperature and short days — 10.8 hours of daylight at 8°C.
- Over the next 10 days
- about 7mm of leaf
- Next cut due
- not within the next ten days
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 Green Bay, Wisconsin
46°F7.9°C
at 6cm — germination depth
Too cold to seed — 7.9°C at 6cm and not warming.
Cooling over the next 10 days.
An independent estimate from air temperature gives 9.3°C, 1.7°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 not growing fast enough to make much use of 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.
Green Bay, Wisconsin in detail
Soil temperature in Green Bay, Wisconsin is currently 7.9°C at 6cm, and falling about 1.0°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 cold to seed — 7.9°C at 6cm and not warming.
4 of the next 10 days look workable. The best weekend slot right now is Saturday 8am–6pm, on the basis that dry for over a week by then, ground firm.
The next recommended window in Green Bay opens at midday on Wednesday 21 October, and holds while conditions stay put. Underfoot, the ground reads as firm after 16mm rain over the last week, coarse (sandy) soil.
There is frost in the forecast for Green Bay, Wisconsin: Tuesday 27 October has hours cold enough to freeze the leaf. Stay off the grass until it lifts — mowing frosted turf ruptures the cells and the damage shows for weeks.
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.