Last and first frost dates in Sligo

When is the last frost in Sligo?

The last frost in Sligo usually comes around 8 April: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 18 March, while corn waits until 11 May. The first autumn frost follows around 21 November, about 227 days later: harvest or cover frost-tender crops before then.

When to sow and plant

Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day. 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.

When the soil warms up in Sligo

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo). The soil reaches 10 °C 16 days after the last spring frost and 15 °C 59 days after it.

Frost dates near Sligo

Of the nearest cities on our list, the last spring frost ends earliest in Athlone (25 February) and latest in Letterkenny (30 March).

Seeds, seedlings and markets in Sligo

Within 15 km of Sligo OpenStreetMap lists 2 garden centres and 1 farm shop (collected 20 October 2026). The nearest garden centre to the city centre is Horkans, 1 km away.

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

• Where to buy seeds and seedlings in Sligo
• Selling your own harvest in Ireland

Places: © OpenStreetMap contributors, ODbL.

Weather in Sligo by month

Average weather in Sligo over 2016–2025: the warmest month is August. No month averages 20 °C by day; the warmest, August, reaches 17.9 °C. No month averages below 0 °C at night; the coldest nights, in January, average 2.8 °C. About 1438 mm of rain falls in a year, on 225 days; August is the wettest month (157 mm) and April the driest (86 mm).

Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).

Planted in autumn

From a month before the first autumn frost, so the roots grow before winter, to the late-planting limit on each crop’s page (about two weeks before the ground freezes, by ten years of weather).