When to plant tomatoes in Bonn: 16 May – 30 July

In Bonn, tomato: sow for seedlings from 4 March to 8 June; plant into a greenhouse from 25 April to 30 July; plant out into open ground from 16 May to 30 July. For plants and seeds, the places nearby include Pflanzenwelt (garden centre, 5 km) and Gartenbaumschule Fuhs (garden centre, 6 km); addresses and opening hours are below.

Tomato 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 15 °C — the minimum on the tomato card — only around 16 May, 38 days later.

Last spring frost	8 April
Top 7 cm of soil at 15 °C	16 May, 38 days after the last frost
Into an unheated greenhouse	25 April – 30 July; April outside: 4.8 °C at night, 14.8 °C by day; card 16–27 °C
First autumn frost	19 November, 187 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	25 July – 8 October
Days left for picking	117
Daylight	12:27 on 25 March, 15:32 on 16 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, August, has 12 rainy days

Tomato in Bonn: care after planting

Planted on 16 May: in the first weeks water every 4 days.

Feeding, by the card’s schedule from that day:

16 May — feed: balanced (NPK)
13 June — feed: nitrogen

Pests and diseases of tomato to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in Bonn during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, August, averages 24.8 °C. Months that stay below 16 °C even by day on average: October (15.9 °C) and November (10.1 °C). Nights average below 16 °C in every month of the season, from 4.3 °C to 14.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19	8.9	70	12	15:29
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

Tomato in nearby cities

1 of the nearest cities share Bonn's date.

City	Distance	Date	Difference
Cologne	25 km	12 May – 31 July	4 days earlier
Düsseldorf	60 km	10 May – 1 August	6 days earlier
Duisburg	81 km	10 May – 2 August	6 days earlier
Essen	81 km	11 May – 1 August	5 days earlier
Bochum	84 km	13 May – 31 July	3 days earlier
Dortmund	90 km	16 May – 27 July	same day

Where to buy tomato plants and seeds near Bonn

Buy plants ready to set out from 16 May to 30 July (from 25 April to 30 July for an unheated greenhouse); seed for raising your own is sown from 4 March to 8 June. 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).

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
Gartenbaumschule Fuhs — garden centre
Alfterer Straße 208, 53347 Alfter · Mar–Oct: Mon closed; Mar–Oct: Tue–Fri 09:00–18:30; Mar–Oct: Sat 09:00–16:00; Nov–Dec: Mon closed; Nov–Dec: Tue–Fri 09:00–17:00; Nov–Dec: Sat 09:00–16:00; Jan–Feb: Mon closed; Jan–Feb: Tue–Fri 09:00–17:00; Jan–Feb: Sat 09:00–13:00 · 6 km · gartenbaumschule-fuhs.de
Pflanzen Breuer — garden centre
Am Apfelbäumchen 1, 53757 Sankt Augustin · Mon–Fri 09:00–19:30; Sat 09:00–18:00; Sun 11:00–16:00 · 9 km · pflanzen-breuer.de
Saengerhof — garden centre
Sängerhof 1, 53340 Meckenheim · Mon–Fri 09:00–19:00, Sat 09:00–18:00; easter -52 days 09:00–13:00; easter -48 days closed; public holidays closed · 11 km · saengerhof.de

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.

Questions