When to plant watermelons in Carlisle: 15 July – 6 August

In Carlisle, watermelon: sow for seedlings from 27 May to 9 July; plant into a greenhouse from 24 June to 6 August; plant out into open ground from 15 July to 6 August. For plants and seeds, the places nearby include Jim Peet Agriculture (farm supply, 11 km) and Whitesyke Garden Centre (garden centre, 12 km); addresses and opening hours are below.

Watermelon in Carlisle: soil, season and weather

In Carlisle the soil, not frost, sets the date: the last frost is over around 26 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 15 July, 80 days later.

Last spring frost	26 April
Top 7 cm of soil at 18 °C	15 July, 80 days after the last frost
Into an unheated greenhouse	24 June – 6 August; June outside: 10.4 °C at night, 18.1 °C by day; card 18–35 °C
First autumn frost	15 November, 123 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	12 September – 4 October
Days left for picking	64
Daylight	17:20 on 17 June, 16:49 on 15 July
Watering outdoors when fruiting (card)	every 5 days; the driest month, November, has 15 rainy days

The same dates in Carlisle hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Carlisle: care after planting

Planted on 15 July: in the first weeks water every 5 days.

Feeding, by the card’s schedule from that day:

15 July — feed: balanced (NPK)

Pests and diseases of watermelon to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in Carlisle during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 19.1 °C. Months that stay below 18 °C even by day on average: September (16.6 °C), October (13.2 °C) and November (9.3 °C). Nights average below 18 °C in every month of the season, from 3.8 °C to 11.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
July	19.1	11.9	132	18	16:49
August	18.6	11.8	136	18	15:01
September	16.6	9.9	118	17	12:48
October	13.2	7.5	131	17	10:35
November	9.3	3.8	112	15	8:27

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Carlisle, Leeds is 20 days earlier and Glasgow 6 days later.

City	Distance	Date	Difference
Newcastle upon Tyne	86 km	26 June – 11 August	19 days earlier
Edinburgh	119 km	6 July – 31 July	9 days earlier
Glasgow	136 km	21 July – 2 August	6 days later
Bradford	145 km	27 June – 9 August	18 days earlier
Stirling	151 km	11 July – 31 July	4 days earlier
Leeds	151 km	25 June – 14 August	20 days earlier

Where to buy watermelon plants and seeds near Carlisle

Buy plants ready to set out from 15 July to 6 August (from 24 June to 6 August for an unheated greenhouse); seed for raising your own is sown from 27 May to 9 July. Within 15 km of Carlisle OpenStreetMap lists 7 garden centres, 2 farm-supply shops, 1 plant nursery and 1 farm shop (collected 28 October 2026).

Whitesyke Garden Centre — garden centre
Brampton Road, CA6 5TR · 12 km
Tarn Road Nursery — garden centre
Mon–Sun 10:00–04:00 · 15 km
Jim Peet Agriculture — farm supply
Sandysike Industrial Estate, CA6 5SS Longtown · 11 km · jimpeet.co.uk
Dobbies — garden centre
6 km

Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

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