When to plant tomatoes in Olomouc: 17 May – 17 July

In Olomouc, tomato: sow for seedlings from 5 March to 26 May; plant into a greenhouse from 26 April to 17 July; plant out into open ground from 17 May to 17 July. For plants and seeds, the places nearby include MJM agro (farm supply, 2 km) and Okrasná školka Droždín (garden centre, 7 km); addresses and opening hours are below.

Tomato in Olomouc: soil, season and weather

In Olomouc the soil, not frost, sets the date: the last frost is over around 21 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 17 May, 26 days later.

Last spring frost	21 April
Top 7 cm of soil at 15 °C	17 May, 26 days after the last frost
Into an unheated greenhouse	26 April – 17 July; April outside: 4.4 °C at night, 15.1 °C by day; card 16–27 °C
First autumn frost	6 November, 173 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	26 July – 25 September
Days left for picking	103
Daylight	12:30 on 26 March, 15:26 on 17 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 9 rainy days

Tomato in Olomouc: care after planting

Planted on 17 May: in the first weeks water every 4 days.

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

17 May — feed: balanced (NPK)
14 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 Olomouc during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, August, averages 26.3 °C. Months that stay below 16 °C even by day on average: October (15 °C) and November (8.2 °C). Nights average below 16 °C in every month of the season, from 1.9 °C to 15.3 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19.3	8.8	71	13	15:20
June	25	13.9	80	12	16:16
July	26.1	15.2	76	12	15:54
August	26.3	15.3	85	10	14:29
September	21.2	11.2	93	10	12:40
October	15	6.6	60	10	10:51
November	8.2	1.9	53	9	9:07

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Olomouc, Opole is 6 days earlier and Brno 9 days later.

City	Distance	Date	Difference
Zlín	51 km	22 May – 17 July	5 days later
Brno	63 km	26 May – 17 July	9 days later
Ostrava	77 km	25 May – 20 July	8 days later
Pardubice	117 km	21 May – 21 July	4 days later
Hradec Králové	123 km	21 May – 22 July	4 days later
Opole	130 km	11 May – 29 July	6 days earlier

Where to buy tomato plants and seeds near Olomouc

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

HECHT - specialista na zahradu — garden centre
Sebastiniho 579, 79607 Prostějov · Mon–Sun 08:00–20:00 · 15 km · cz.hecht.cz
Okrasná školka Droždín — garden centre
Horní Úlehla 324/32, 77900 Olomouc - Droždín · 7 km · drozdin.cz
MJM agro — farm supply
Mon–Fri 07:30–17:00, Sat 08:00–12:00 · 2 km
Tržnice — market
Mon–Sun, public holidays 00:00–00:00 · 0 km

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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