Last and first frost dates in Leuven

When is the last frost in Leuven?

The last frost in Leuven usually comes around 19 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 29 March, while corn waits until 26 April. The first autumn frost follows around 22 November, about 217 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 Leuven

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 21 days before the last spring frost and 15 °C 21 days after it.

Frost dates near Leuven

Of the nearest cities on our list, the last spring frost ends earliest in Antwerp (4 April) and latest in Hasselt (19 April).

Seeds, seedlings and markets in Leuven

Within 15 km of Leuven OpenStreetMap lists 31 garden centres, 1 plant nursery, 7 markets and 21 farm shops (collected 27 October 2026). The nearest garden centre to the city centre is Aveve, 2 km away.

• Aveve — garden centre
  Aarschotsesteenweg 94;88, 3012 Leuven · Mon–Fri 09:00–18:30; Sat 09:00–18:00 · 2 km · aveve.be
• Bloemenmarkt — market
  Thu 13:00–18:00 · 0 km
• Hoeveslagerij Ten Halve — farm shop
  Karrestraat 12 · 4 km
• Brico Garden — garden centre
  Vlinderlaan 1, 3360 · 4 km
• Zaterdagmarkt — market
  Sat 09:00–18:00 · 0 km
• Benny Fets — farm shop
  Duigemstraat 11 · 4 km

• Where to buy seeds and seedlings in Leuven
• Selling your own harvest in Belgium

Places: © OpenStreetMap contributors, ODbL.

Weather in Leuven by month

Average weather in Leuven over 2016–2025: the warmest month is August. Months that average 20 °C or more by day: June–September (20.6–23.7 °C). No month averages below 0 °C at night; the coldest nights, in January, average 1.3 °C. About 844 mm of rain falls in a year, on 151 days; January is the wettest month (81 mm) and April the driest (44 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).