Last and first frost dates in Mons

When is the last frost in Mons?

The last frost in Mons usually comes around 10 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 20 March, while corn waits until 20 April. The first autumn frost follows around 19 November, about 223 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 Mons

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 6 days before the last spring frost and 15 °C 36 days after it.

Frost dates near Mons

Of the nearest cities on our list, the last spring frost ends earliest in Kortrijk (4 April) and latest in Charleroi (13 April).

Seeds, seedlings and markets in Mons

Within 15 km of Mons OpenStreetMap lists 21 garden centres, 1 farm-supply shop, 2 plant nurseries, 8 markets and 15 farm shops (collected 27 October 2026). The nearest garden centre to the city centre is Les Jardins du Kiwanis - Ancien Ets Horticulture JOB, 2 km away.

• Les Jardins du Kiwanis - Ancien Ets Horticulture JOB — garden centre
  Chemin de la Procession 350-352 · Fri 09:30–11:45, 14:00–17:00; Sat 09:30–11:45 · 2 km
• STBC - Espaces Verts — plant nursery
  Chaussée de Binche 56A · 3 km
• Marché aux Poissons — market
  Fri 08:00–13:00 · 0 km
• Jacmain — farm shop
  Chemin Saint-Pierre 38 · 3 km
• Acar & Fils — garden centre
  Chaussée du Roi Baudouin 105 · Tue–Fri 10:00–12:00, 14:00–18:00; Sat 09:00–12:00, 13:30–17:00 · 5 km · ets-acar.be
• Vieux-Marché — market
  Sun 08:00–14:00 · 0 km

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

Places: © OpenStreetMap contributors, ODbL.

Weather in Mons by month

Average weather in Mons over 2016–2025: the warmest month is August. Months that average 20 °C or more by day: June–September (20.3–23.5 °C). No month averages below 0 °C at night; the coldest nights, in January, average 1 °C. About 847 mm of rain falls in a year, on 149 days; January is the wettest month (90 mm) and April the driest (46 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).