When to plant tomatoes in Brno: 26 May – 17 July

In Brno, tomato: sow for seedlings from 14 March to 26 May; plant into a greenhouse from 5 May to 17 July; plant out into open ground from 26 May to 17 July. For plants and seeds, the places nearby include Zahradnictví u Mašků (garden centre, 3 km) and Zahradnictví Julíánov (garden centre, 4 km); addresses and opening hours are below.

Tomato in Brno: soil, season and weather

In Brno the soil, not frost, sets the date: the last frost is over around 24 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 26 May, 32 days later.

Last spring frost	24 April
Top 7 cm of soil at 15 °C	26 May, 32 days after the last frost
Into an unheated greenhouse	5 May – 17 July; May outside: 8.6 °C at night, 18.5 °C by day; card 16–27 °C
First autumn frost	6 November, 164 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	4 August – 25 September
Days left for picking	94
Daylight	13:02 on 4 April, 15:44 on 26 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, October, has 9 rainy days

Tomato in Brno: care after planting

Planted on 26 May: in the first weeks water every 4 days.

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

26 May — feed: balanced (NPK)
23 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 Brno during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 25.5 °C. Months that stay below 16 °C even by day on average: October (14.3 °C) and November (7.4 °C). Nights average below 16 °C in every month of the season, from 1.7 °C to 15 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	18.5	8.6	73	13	15:18
June	24.2	13.6	71	11	16:12
July	25.5	14.9	69	11	15:51
August	25.5	15	70	9	14:27
September	20.4	11	83	10	12:39
October	14.3	6.4	44	9	10:52
November	7.4	1.7	45	9	9:10

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

All the nearest cities on our list plant tomato earlier than Brno; the closest date is in Vienna, 3 days earlier.

City	Distance	Date	Difference
Olomouc	63 km	17 May – 17 July	9 days earlier
Zlín	77 km	22 May – 17 July	4 days earlier
Pardubice	111 km	21 May – 21 July	5 days earlier
Vienna	111 km	23 May – 23 July	3 days earlier
Bratislava	122 km	14 May – 27 July	12 days earlier
Hradec Králové	126 km	21 May – 22 July	5 days earlier

Where to buy tomato plants and seeds near Brno

Buy plants ready to set out from 26 May to 17 July (from 5 May to 17 July for an unheated greenhouse); seed for raising your own is sown from 14 March to 26 May. Within 15 km of Brno OpenStreetMap lists 15 garden centres, 3 farm-supply shops, 1 plant nursery, 6 markets and 7 farm shops (collected 28 October 2026).

Zahradnictví Chaloupka — garden centre
Nová 2, 66441 Troubsko · Tue–Fri 09:00–12:00; Tue–Fri 13:00–17:00; Sat 09:00–12:00 · 8 km · zahradnictvichaloupka.webnode.cz
Zahradnictví Brabec — garden centre
Chrlická 875, 66442 · Mon–Fri 08:30–18:00; Sat–Sun 08:00–18:00 · 8 km · brabeczc.cz
Zahradnictví u Mašků — garden centre
Mar–Oct Mon–Fri 08:00–18:00; Nov, Dec, Jan, Feb Mon–Fri 08:00–17:00; Sat 08:00–12:00; Sun, public holidays closed · 3 km · zahradnictvi-u-masku.cz
Zahradnictví Julíánov — garden centre
Mon–Fri 08:00–18:00; Sat 08:00–12:00 · 4 km · facebook.com

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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