GreenlyWhen to plant zucchini in Bonn: 4 June – 2 September
In Bonn, zucchini: sow for seedlings from 23 April to 12 August; plant into a greenhouse from 14 May to 2 September; plant out into open ground from 4 June to 2 September. For plants and seeds, the places nearby include Samenhandlung Karl Schmitz (farm supply, 1 km) and RWZ-Agrartechnik Roisdorf (farm supply, 7 km); addresses and opening hours are below.
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Zucchini in Bonn: soil, season and weather
In Bonn the soil, not frost, sets the date: the last frost is over around 8 April, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 4 June, 57 days later.
| Last spring frost | 8 April |
|---|---|
| Top 7 cm of soil at 18 °C | 4 June, 57 days after the last frost |
| First autumn frost | 19 November, 168 days after the start |
| Days in the bed to the first harvest (card) | 36 |
| First harvest, if planted in this window | 10 July – 8 October |
| Days left for picking | 132 |
| Daylight | 15:26 on 14 May, 16:16 on 4 June |
| Watering outdoors when fruiting (card) | every 3 days; the driest month, August, has 12 rainy days |
The same dates in Bonn hold for Cucumber, Bell Pepper, Eggplant, Pumpkin and Watermelon.
Zucchini in Bonn: care after planting
Planted on 4 June: in the first weeks water every 4 days.
Pests and diseases of zucchini to watch for:
Weather in Bonn during the zucchini season
About 443 mm of rain falls in the season; August is the driest month (64 mm) and July the wettest (83 mm).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days | Daylight on the 15th |
|---|---|---|---|---|---|
| June | 23.6 | 13.6 | 76 | 12 | 16:28 |
| July | 24.3 | 14.6 | 83 | 13 | 16:05 |
| August | 24.8 | 14.9 | 64 | 12 | 14:35 |
| September | 21 | 11.8 | 77 | 10 | 12:41 |
| October | 15.9 | 8.9 | 70 | 14 | 10:48 |
| November | 10.1 | 4.3 | 73 | 15 | 9:00 |
ERA5 2016–2025, Open-Meteo
Zucchini in nearby cities
Around Bonn, Cologne is 1 day earlier and Dortmund 1 day later.
Where to buy zucchini plants and seeds near Bonn
Buy plants ready to set out from 4 June to 2 September (from 14 May to 2 September for an unheated greenhouse); seed for raising your own is sown from 23 April to 12 August. 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).
- RWZ-Agrartechnik Roisdorf — farm supply
Herseler Straße 10, 53332 Bornheim · Mon–Fri 08:00–17:00, Sat 08:00–12:00 · 7 km · rwz.de - Samenhandlung Karl Schmitz — farm supply
Remigiusplatz 3, 53111 Bonn · Mon–Fri 10:00–18:30; Sat 10:00–18:00 · 1 km - Norbert Wirtz Agrarhandel — farm supply
Keldenicher Straße 2 b, 53332 Bornheim · 12 km · wirtz-agrar.de - Heinrich Braun GmbH & Co BetriebsKG — farm supply
Mon–Fri 08:00–12:30, 13:30–18:00; Sat 09:30–13:00 · 12 km · braun-gartentechnik.de
Places: © OpenStreetMap contributors, ODbL.
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.
- How to grow zucchini
- All frost dates and weather of Bonn
- Shops and markets: Bonn
- Selling a surplus in Germany
- Bonn: #374 of 801 by frost-free season
- Moon planting calendar for November 2026
- How we calculate the dates
Questions
When to plant zucchini in Bonn?
In Bonn, zucchini: sow for seedlings from 23 April to 12 August; plant into a greenhouse from 14 May to 2 September; plant out into open ground from 4 June to 2 September.
When to sow zucchini for seedlings in Bonn?
Sow for seedlings from 23 April to 12 August.
When is the last spring frost in Bonn?
Last spring frost around 8 April, first autumn frost around 19 November.
