TR4, Cornwall
Mowing
When you can next cut it, and the best slot this weekend.
Best weekend slot
Nothing doing
Verdict: Not worth it
ground waterlogged.
Tomorrow afternoon is your first decent window.
Next mow
Tomorrow 2pm–7pm
Verdict: Prime time
grass slightly damp — rain earlier that day
- Worth watching: Ground still soft. 44mm rain over the last week, medium (loam) soil. 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.
Monday 19 October: nothing to cut. Nothing to cut — the grass is barely growing (growth potential 0.08).
Monday 19 October, hour by hour 5am 6am 7am 8am 9am 10am 11am midday 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm Chance — — — — — — — — — — — — — — — — Verdict Already gone Already gone Already gone Already gone 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 Rainchance · · · · · · · — — — — — — — — — Rainmm · · · · · · · — 1.2 0.5 1.3 1.1 — — — — Grass · · · · · · · soaked soaked soaked soaked soaked soaked soaked soaked soaked Ground · · · · · · · firm firm firm firm firm firm firm firm firm Temp · · · · · · · 10° 10° 11° 11° 11° 11° 10° 9° 10° Windkm/h · · · · · · · 9 5 14 22 19 14 10 10 9 Daylight · · · · · · · ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — Growth: barely growing (growth potential 0.08). Not enough to be worth cutting, which is why no hour is recommended today whatever the weather does.
Monday 19 OctoberConfident
Nothing to cut — the grass is barely growing (growth potential 0.08).
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 20 October: 5 hours worth using. 2pm–7pm — grass slightly damp — rain earlier that day
Tuesday 20 October, hour by hour 5am 6am 7am 8am 9am 10am 11am midday 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm Chance — — — — — — — — — — — — — — — — Verdict dark dark dark Forget it Forget it Forget it Forget it Forget it Forget it Good to go Prime time Prime time Prime time Prime time dark dark Rainchance — — — — — — — — — — — — — — — — Rainmm — — — — — — — — — — — — — — 1.9 0.4 Grass soaked soaked soaked soaked soaked soaked soaked soaked soaked damp damp damp damp dry soaked soaked Ground firm firm firm firm firm firm firm firm firm firm firm firm firm firm firm firm Temp 9° 7° 7° 6° 8° 11° 12° 13° 13° 13° 14° 13° 12° 12° 10° 11° Windkm/h 6 8 8 8 9 6 10 13 13 14 14 13 14 13 12 13 Daylight — — — ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — Growth: barely growing (growth potential 0.15). 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 · 2pm–7pmConfident
2pm–7pm — grass slightly damp — rain earlier that day
Limiting factor:grass wetness
Wednesday 21 October: 4 hours worth using. 1pm–5pm — grass dry — rain earlier that day
Wednesday 21 October, hour by hour 5am 6am 7am 8am 9am 10am 11am midday 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm Chance — — — — — — — — — — — — — — — — Verdict dark dark dark ground waterlogged ground waterlogged Forget it Forget it ground waterlogged Good to go Good to go Good to go Prime time 0.3mm of rain falling 0.3mm of rain falling dark dark Rainchance — — — — — — — — — — — — — — — — Rainmm 1.6 0.2 — — — — — — — — — — 0.3 0.3 0.3 0.5 Grass soaked soaked soaked soaked soaked soaked wet damp damp damp dry dry dry dry wet soaked Ground bog bog bog bog bog soft soft bog soft soft soft soft soft soft bog bog Temp 9° 10° 10° 10° 10° 11° 11° 11° 11° 12° 12° 12° 12° 11° 11° 11° Windkm/h 39 37 42 37 39 37 40 42 44 44 40 37 33 30 27 25 Daylight — — — ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — Growth: barely growing (growth potential 0.15). 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 · 1pm–5pmConfident
1pm–5pm — grass dry — rain earlier that day
Limiting factor:grass wetness
Thursday 22 October: 1 hour worth using. 1pm–2pm — ground soft in places — 30mm rain over the last week, medium (loam) soil
Thursday 22 October, hour by hour 5am 6am 7am 8am 9am 10am 11am midday 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm Chance — — — — — — — — — — — — — — — — Verdict dark dark dark ground waterlogged ground waterlogged ground waterlogged ground waterlogged ground waterlogged Prime time 0.3mm of rain falling 0.3mm of rain falling 0.3mm of rain falling 3.2mm of rain falling 3.2mm of rain falling dark dark Rainchance — — — — — — — — — — — — — — — — Rainmm — — — — — — — — — 0.3 0.3 0.3 3.2 3.2 3.2 2.1 Grass soaked wet damp damp dry dry dry dry dry dry damp soaked soaked soaked soaked soaked Ground bog bog bog bog bog bog bog bog soft soft soft soft bog bog bog bog Temp 12° 12° 12° 12° 12° 13° 13° 14° 14° 13° 12° 11° 12° 12° 12° 13° Windkm/h 29 26 23 20 17 15 15 17 19 22 24 28 33 38 42 43 Daylight — — — ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — Growth: growing slowly (growth potential 0.24). 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 · 1pm–2pmConfident
1pm–2pm — ground soft in places — 30mm rain over the last week, medium (loam) soil
Limiting factor:ground firmness
Friday 23 October: no hours worth using. No — 0.6mm of rain falling.
Friday 23 October, hour by hour 5am 6am 7am 8am 9am 10am 11am midday 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm Chance — — — — — — — — — — — — — — — — Verdict dark dark dark 0.6mm of rain falling 0.6mm of rain falling 0.6mm of rain falling 1.0mm of rain falling 1.0mm of rain falling 1.0mm of rain falling 1.2mm of rain falling 1.2mm of rain falling 1.2mm of rain falling 0.1mm of rain falling 0.1mm of rain falling dark dark Rainchance — — — — — — — — — — — — — — — — Rainmm 0.5 0.5 0.5 0.6 0.6 0.6 1 1 1 1.2 1.2 1.2 0.1 0.1 0.1 1 Grass soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked Ground bog bog bog bog bog bog bog bog bog bog bog bog bog bog bog bog Temp 10° 10° 10° 10° 11° 11° 10° 9° 9° 9° 9° 9° 10° 10° 10° 10° Windkm/h 72 70 67 64 59 54 50 47 44 43 43 43 43 44 44 43 Daylight — — — ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — Growth: barely growing (growth potential 0.11). 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 OctoberReasonably confident
No — 0.6mm of rain falling.
Limiting factor:grass wetness
Saturday 24 October: no hours worth using. No — ground waterlogged.
Saturday 24 October, hour by hour 5am 6am 7am 8am 9am 10am 11am midday 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm Chance — — — — — — — — — — — — — — — — Verdict dark dark dark ground waterlogged ground waterlogged ground waterlogged 0.5mm of rain falling 0.5mm of rain falling 0.5mm of rain falling 2.0mm of rain falling 2.0mm of rain falling 2.0mm of rain falling 1.0mm of rain falling 1.0mm of rain falling dark dark Rainchance — — — — — — — — — — — — — — — — Rainmm — — — — — — 0.5 0.5 0.5 2 2 2 1 1 1 0.3 Grass soaked soaked soaked soaked wet wet soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked Ground bog bog bog bog bog bog bog bog bog bog bog bog bog bog bog bog Temp 11° 11° 11° 11° 11° 11° 11° 11° 10° 11° 12° 12° 14° 15° 16° 16° Windkm/h 30 28 26 24 22 21 20 21 23 28 36 42 42 41 39 39 Daylight — — — ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — Growth: growing slowly (growth potential 0.23). 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 OctoberReasonably confident
No — ground waterlogged.
Limiting factor:grass wetness
Sunday 25 October: no hours worth using. No — 0.3mm of rain falling.
Sunday 25 October, hour by hour 5am 6am 7am 8am 9am 10am 11am midday 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm Chance — — — — — — — — — — — — — — — — Verdict dark dark 0.3mm of rain falling 0.3mm of rain falling 0.3mm of rain falling 0.3mm of rain falling 0.3mm of rain falling 0.3mm of rain falling ground waterlogged ground waterlogged ground waterlogged Forget it Forget it dark dark dark Rainchance — — — — — — — — — — — — — — — — Rainmm 0.4 0.4 0.3 0.3 0.3 0.3 0.3 0.3 — — — — — — — — Grass soaked soaked soaked soaked soaked soaked soaked soaked soaked wet wet damp damp damp dry dry Ground bog bog bog bog bog bog bog bog bog bog bog sodden sodden sodden sodden sodden Temp 16° 16° 16° 16° 15° 15° 14° 14° 14° 14° 13° 13° 13° 13° 13° 13° Windkm/h 40 42 45 48 51 55 57 59 59 58 57 55 53 51 50 48 Daylight — — ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — — 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.
Sunday 25 OctoberReasonably confident
No — 0.3mm of rain falling.
Limiting factor:ground firmness
Monday 26 October: no hours worth using. No — 0.1mm of rain falling.
Monday 26 October, hour by hour 5am 6am 7am 8am 9am 10am 11am midday 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm Chance — — — — — — — — — — — — — — — — Verdict dark dark dark 0.1mm of rain falling 0.1mm of rain falling 0.1mm of rain falling 0.1mm of rain falling 0.1mm of rain falling Forget it Forget it Forget it Forget it Forget it dark dark dark Rainchance — — — — — — — — — — — — — — — — Rainmm 0.2 0.2 0.1 0.1 0.1 0.1 0.1 0.1 — — — — — — 0.1 0.1 Grass soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked Ground sodden sodden sodden sodden sodden sodden sodden sodden sodden sodden sodden sodden soggy soggy soggy soggy Temp 11° 11° 12° 12° 13° 13° 14° 14° 14° 14° 13° 13° 13° 13° 13° 14° Windkm/h 18 17 14 9 8 13 17 19 17 12 5 4 10 14 16 17 Daylight — — — ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — — Growth: growing slowly (growth potential 0.25). 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 OctoberReasonably confident
No — 0.1mm of rain falling.
Limiting factor:grass wetness
Tuesday 27 October: 2 hours worth using. 4pm–6pm — ground soft — 70mm rain over the last week, medium (loam) soil
Tuesday 27 October, hour by hour 5am 6am 7am 8am 9am 10am 11am midday 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm Chance — — — — — — — — — — — — — — — — Verdict dark dark dark 0.2mm of rain falling 0.2mm of rain falling 0.2mm of rain falling 0.2mm of rain falling 0.2mm of rain falling ground waterlogged ground waterlogged Forget it Good to go Good to go dark dark dark Rainchance — — — — — — — — — — — — — — — — Rainmm 0.4 0.4 0.2 0.2 0.2 0.2 0.2 0.2 — — — — — — — — Grass soaked soaked soaked soaked soaked soaked soaked soaked wet damp damp damp damp dry dry dry Ground bog bog bog bog bog bog bog bog bog bog soggy soggy soggy soggy soggy soggy Temp 15° 15° 15° 15° 15° 15° 14° 14° 14° 14° 14° 13° 13° 13° 12° 12° Windkm/h 26 26 26 26 27 29 30 30 29 28 25 23 21 20 19 18 Daylight — — — ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — — Growth: growing slowly (growth potential 0.33). 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 · 4pm–6pmLow confidence this far out
4pm–6pm — ground soft — 70mm rain over the last week, medium (loam) soil
Limiting factor:ground firmness
Wednesday 28 October: no hours worth using. No — 0.4mm of rain falling.
Wednesday 28 October, hour by hour 5am 6am 7am 8am 9am 10am 11am midday 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm Chance — — — — — — — — — — — — — — — — Verdict dark dark dark 0.4mm of rain falling 0.4mm of rain falling 0.4mm of rain falling 0.4mm of rain falling 0.4mm of rain falling 0.5mm of rain falling 0.5mm of rain falling 0.5mm of rain falling 0.5mm of rain falling 0.5mm of rain falling dark dark dark Rainchance — — — — — — — — — — — — — — — — Rainmm 0.1 0.1 0.4 0.4 0.4 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.5 0.1 0.1 Grass soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked soaked Ground soggy soggy soggy soggy soggy soggy bog bog bog bog bog bog bog bog bog bog Temp 11° 11° 11° 12° 13° 14° 15° 15° 15° 15° 14° 14° 13° 13° 13° 13° Windkm/h 17 18 19 20 22 23 25 26 26 27 27 27 27 26 25 24 Daylight — — — ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — — — Growth: growing slowly (growth potential 0.25). 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 OctoberLow confidence this far out
No — 0.4mm of rain falling.
Limiting factor:grass wetness
good to go touch and go dark, frost or snow already goneFainter means fewer forecast runs agree.
Growth
How fast it is growing, and when it will need cutting again.
8%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 — 10.5 hours of daylight at 9°C.
- Over the next 10 days
- about 8mm 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 TR4, Cornwall
10.6°C51°F
at 6cm — germination depth
Seeding conditions are open — soil is 10.6°C at 6cm and holding above 9°C.
Warming over the next 10 days.
Cross-checks against an independent estimate from air temperature (9.7°C), which agrees to within 0.0°C.
Almost every UK and Irish lawn is a ryegrass and fescue mix, whether it was sown or turfed. We assume that, and use 9°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 ryegrasslikely yours | 8°C | 5–10 |
| Red / chewings fescuelikely yours | 8–10°C | 10–14 |
| Tall fescue | 10–12°C | 10–14 |
| Browntop bentColonial bentgrass | 10–12°C | 14–21 |
| Smooth-stalked meadow grassKentucky bluegrass | 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.
TR4, Cornwall in detail
Soil temperature in TR4, Cornwall is currently 10.6°C at 6cm, and rising about 2.7°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 perennial ryegrass with fescue, which is what most lawns round here are sown with. That blend needs the soil to hold above 9°C before seed germinates reliably. Seeding conditions are open — soil is 10.6°C at 6cm and holding above 9°C.
4 of the next 10 days look workable. The other 6 are held back by wet grass or soft ground. As for the weekend: nothing doing. ground waterlogged.
The next recommended window in TR4 opens at 2pm on Tuesday 20 October, because that is when the dew has burnt off — earlier than that and you are cutting wet grass. Underfoot, the ground reads as firm after 8mm rain over the last week, medium (loam) soil.
Save this lawn and we will email you when the windows open.
We already send you the forecast email? Use the same address.
Single-model forecast here — no ensemble covers this location, so there are no odds to show. Forecast from Open-Meteo, refreshed through the day. Soil temperature is modelled, not measured — how that works and where the thresholds come from.