When to plant tomatoes in Sligo: 6 June – 1 August

In Sligo, tomato: sow for seedlings from 25 March to 10 June; plant into a greenhouse from 16 May to 1 August; plant out into open ground from 6 June to 1 August. For plants and seeds, the places nearby include Horkans (garden centre, 1 km) and Homeland Plus (farm shop, 2 km); addresses and opening hours are below.

Tomato in Sligo: soil, season and weather

In Sligo the soil, not frost, sets the date: the last frost is over around 8 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 6 June, 59 days later.

Last spring frost	8 April
Top 7 cm of soil at 15 °C	6 June, 59 days after the last frost
Into an unheated greenhouse	16 May – 1 August; May outside: 7.6 °C at night, 15.4 °C by day; card 16–27 °C
First autumn frost	21 November, 168 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	15 August – 10 October
Days left for picking	98
Daylight	14:01 on 15 April, 16:59 on 6 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 19 rainy days

Tomato in Sligo: care after planting

Planted on 6 June: in the first weeks water every 4 days.

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

6 June — feed: balanced (NPK)
4 July — feed: nitrogen

Pests and diseases of tomato 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 Sligo during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, August, averages 17.9 °C. Months that stay below 16 °C even by day on average: September (15.9 °C), October (12.9 °C) and November (9.6 °C). Nights average below 16 °C in every month of the season, from 5 °C to 11.6 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	17	10.2	125	20	17:10
July	17.7	11.6	128	21	16:42
August	17.9	11.6	157	22	14:57
September	15.9	9.9	123	19	12:47
October	12.9	8	138	19	10:37
November	9.6	5	115	19	8:33

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Sligo, Galway is 6 days earlier and Belfast 9 days later.

City	Distance	Date	Difference
Letterkenny	91 km	7 June – 8 August	1 day later
Athlone	101 km	2 June – 6 August	4 days earlier
Derry	110 km	7 June – 1 August	1 day later
Galway	118 km	31 May – 8 August	6 days earlier
Dundalk	138 km	14 June – 31 July	8 days later
Belfast	168 km	15 June – 30 July	9 days later

Where to buy tomato plants and seeds near Sligo

Buy plants ready to set out from 6 June to 1 August (from 16 May to 1 August for an unheated greenhouse); seed for raising your own is sown from 25 March to 10 June. Within 15 km of Sligo OpenStreetMap lists 2 garden centres and 1 farm shop (collected 20 October 2026).

Horkans — garden centre
Mon–Sun 10:00–18:00 · 1 km
Homebase — garden centre
Carraroe Retail Park, Sligo · 2 km
Homeland Plus — farm shop
Deep Water Quay, F91 HR53 Sligo · 2 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.

Questions