When to plant tomatoes in Potsdam: 14 May – 1 August

In Potsdam, tomato: sow for seedlings from 2 March to 10 June; plant into a greenhouse from 23 April to 1 August; plant out into open ground from 14 May to 1 August. For plants and seeds, the places nearby include Foerster Stauden (garden centre, 4 km) and Potsdamer Staudenkulturen GbR (garden centre, 6 km); addresses and opening hours are below.

Tomato in Potsdam: soil, season and weather

In Potsdam the soil, not frost, sets the date: the last frost is over around 5 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 14 May, 39 days later.

Last spring frost	5 April
Top 7 cm of soil at 15 °C	14 May, 39 days after the last frost
Into an unheated greenhouse	23 April – 1 August; April outside: 5 °C at night, 14.4 °C by day; card 16–27 °C
First autumn frost	21 November, 191 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	23 July – 10 October
Days left for picking	121
Daylight	12:20 on 23 March, 15:40 on 14 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 7 rainy days

Tomato in Potsdam: care after planting

Planted on 14 May: in the first weeks water every 4 days.

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

14 May — feed: balanced (NPK)
11 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 Potsdam during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, August, averages 24.7 °C. Months that stay below 16 °C even by day on average: October (14.9 °C) and November (8.5 °C). Nights average below 16 °C in every month of the season, from 3.5 °C to 15.6 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19.1	9.6	44	9	15:43
June	24.2	14.3	68	10	16:47
July	24.2	15.2	68	11	16:21
August	24.7	15.6	49	8	14:45
September	20.8	12.3	41	7	12:44
October	14.9	8.4	57	11	10:43
November	8.5	3.5	44	11	8:48

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Potsdam, Zielona Góra is 5 days earlier and Dresden 11 days later.

City	Distance	Date	Difference
Berlin	27 km	10 May – 30 July	4 days earlier
Magdeburg	102 km	14 May – 29 July	same day
Leipzig	127 km	15 May – 28 July	1 day later
Szczecin	152 km	12 May – 28 July	2 days earlier
Dresden	157 km	25 May – 29 July	11 days later
Zielona Góra	175 km	9 May – 24 July	5 days earlier

Where to buy tomato plants and seeds near Potsdam

Buy plants ready to set out from 14 May to 1 August (from 23 April to 1 August for an unheated greenhouse); seed for raising your own is sown from 2 March to 10 June. Within 15 km of Potsdam OpenStreetMap lists 16 garden centres, 1 farm-supply shop, 8 plant nurseries, 12 markets and 28 farm shops (collected 28 October 2026).

Foerster Stauden — garden centre
Am Raubfang 6, 14469 Potsdam · Tue–Sat 09:00–19:00; Sun 11:00–14:00; Mon 14:00–19:00 · 4 km · foerster-stauden.de
Potsdamer Staudenkulturen GbR — garden centre
Golmer Chaussee 47, 14469 Potsdam · Mon–Fri 08:00–18:00; Sat 08:00–14:00; Sun 10:00–12:00 · 6 km · potsdamer-staudenkulturen.de
Blumen Buba — garden centre
Potsdamer Chaussee 51, 14476 Potsdam · Mon–Sat 09:00–19:00; Sun 10:00–17:00 · 7 km · blumenbuba.de
Rosengut Langerwisch — garden centre
Am Gut 5, 14552 Michendorf · Apr–Jul Mon–Fri 09:00–19:00; Apr–Jul Sat 09:00–18:00; Apr–Jul Sun 09:00–16:00; Apr–Jul public holidays 09:00–14:00; Aug–Mar Mon–Fri 09:00–18:00; Aug–Mar Sat 09:00–17:00; Aug–Mar Sun 09:00–15:00; Aug–Mar public holidays 09:00–14:00; Jan 1, Dec 25, Dec 26 closed · 10 km · rosengut.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.

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