Last and first frost dates in Bonn

When is the last frost in Bonn?

The last frost in Bonn 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 23 April. The first autumn frost follows around 19 November, about 225 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 Bonn

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 4 days before the last spring frost and 15 °C 38 days after it.

Frost dates near Bonn

Of the nearest cities on our list, the last spring frost ends earliest in Düsseldorf (4 April) and latest in Koblenz (27 April).

Seeds, seedlings and markets in Bonn

Within 15 km of Bonn OpenStreetMap lists 32 garden centres, 4 farm-supply shops, 3 plant nurseries, 9 markets and 50 farm shops (collected 28 October 2026). The nearest garden centre to the city centre is Kissener's Gartenmarkt, 3 km away.

• Kissener's Gartenmarkt — garden centre
  Mon–Fri 08:30–18:30; Sat 08:30–14:00; Sun, public holidays closed · 3 km · gartenmarkt-kissener.de
• Samenhandlung Karl Schmitz — farm supply
  Remigiusplatz 3, 53111 Bonn · Mon–Fri 10:00–18:30; Sat 10:00–18:00 · 1 km
• Bio-Weihnachtsbäume Udo Dorant — plant nursery
  Dec 4–23 Mon–Sun 10:00–17:00 · 7 km · biobaumalfter.de
• Wochenmarkt — market
  Mon–Fri 08:00–18:30; Sat 08:00–16:00 · 1 km · bonn.market
• Gut Ostler — farm shop
  Burgweg 19, 53123 Bonn · 4 km · gutostler.de
• Pflanzenwelt — garden centre
  Müldorfer Straße 160, 53229 Bonn · Mon–Fri 09:00–18:30; Sat 09:00–16:00; Sun, public holidays closed; Mar–May Sun, public holidays 10:00–14:00; easter -2 days, easter +1 day, easter +49 days closed · 5 km · die-pflanzenwelt.de

• Where to buy seeds and seedlings in Bonn
• Selling your own harvest in Germany

Places: © OpenStreetMap contributors, ODbL.

Weather in Bonn by month

Average weather in Bonn over 2016–2025: the warmest month is August. Months that average 20 °C or more by day: June–September (21–24.8 °C). No month averages below 0 °C at night; the coldest nights, in January, average 0.8 °C. About 864 mm of rain falls in a year, on 156 days; January is the wettest month (86 mm) and April the driest (54 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).