When to plant zucchini in Letterkenny: 7 July – 11 September

In Letterkenny, zucchini: sow for seedlings from 26 May to 21 August; plant into a greenhouse from 16 June to 11 September; plant out into open ground from 7 July to 11 September. For plants and seeds, the places nearby include Gary's Petworld and Garden Centre (garden centre, 2 km); addresses and opening hours are below.

Zucchini in Letterkenny: soil, season and weather

In Letterkenny the soil, not frost, sets the date: the last frost is over around 30 March, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 7 July, 99 days later.

Last spring frost	30 March
Top 7 cm of soil at 18 °C	7 July, 99 days after the last frost
First autumn frost	28 November, 144 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	12 August – 17 October
Days left for picking	108
Daylight	17:20 on 16 June, 17:08 on 7 July
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 18 rainy days

The same dates in Letterkenny hold for Cucumber, Bell Pepper, Eggplant, Pumpkin and Watermelon.

Zucchini in Letterkenny: care after planting

Planted on 7 July: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Letterkenny during the zucchini season

About 566 mm of rain falls in the season; September is the driest month (102 mm) and August the wettest (126 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
July	17.6	11.4	115	18	16:50
August	17.7	11.5	126	20	15:01
September	15.8	9.8	102	18	12:48
October	12.8	7.9	120	18	10:35
November	9.5	4.9	103	18	8:27

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Letterkenny, Sligo is 7 days earlier and Dundalk 10 days later.

City	Distance	Date	Difference
Derry	26 km	13 July – 4 September	6 days later
Sligo	91 km	30 June – 4 September	7 days earlier
Belfast	122 km	7 July – 2 September	same day
Dundalk	137 km	17 July – 3 September	10 days later
Athlone	172 km	13 July – 9 September	6 days later
Dublin	203 km	16 July – 7 September	9 days later

Where to buy zucchini plants and seeds near Letterkenny

Buy plants ready to set out from 7 July to 11 September (from 16 June to 11 September for an unheated greenhouse); seed for raising your own is sown from 26 May to 21 August. Within 15 km of Letterkenny OpenStreetMap lists 3 garden centres and 1 market (collected 28 October 2026).

Gary's Petworld and Garden Centre — garden centre
Mon–Fri 09:00–18:00 · 2 km
Alcorns — garden centre
2 km · alcorns.ie
Raphoe Garden Centre — garden centre
12 km
Market Square — market
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.

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