When to plant tomatoes in Kostanay: 25 May – 12 June

In Kostanay, tomato: sow for seedlings from 13 March to 21 April; plant into a greenhouse from 4 May to 12 June; plant out into open ground from 25 May to 12 June. For plants and seeds, the places nearby include Invent.kz (garden centre, 3 km) and Садовод (garden centre, 3 km); addresses and opening hours are below.

Tomato in Kostanay: soil, season and weather

In Kostanay the soil, not frost, sets the date: the last frost is over around 4 May, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 25 May, 21 days later.

Last spring frost	4 May
Top 7 cm of soil at 15 °C	25 May, 21 days after the last frost
Into an unheated greenhouse	4 May – 12 June; May outside: 6.9 °C at night, 20.4 °C by day; card 16–27 °C
First autumn frost	2 October, 130 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	3 August – 21 August
Days left for picking	60
Daylight	13:07 on 3 April, 16:20 on 25 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, October, has 8 rainy days

Tomato in Kostanay: care after planting

Planted on 25 May: in the first weeks water every 4 days.

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

25 May — feed: balanced (NPK)
22 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 Kostanay during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 26.2 °C. Months that stay below 16 °C even by day on average: October (8.9 °C). Nights average below 16 °C in every month of the season, from 0.3 °C to 15.3 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	20.4	6.9	48	8	15:50
June	23.9	12.4	51	8	16:56
July	26.2	15.3	60	10	16:30
August	24.7	13.5	51	8	14:50
September	17.3	7.1	37	7	12:45
October	8.9	0.3	36	8	10:40

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Kostanay, Kokshetau is 9 days earlier and Kurgan 4 days later.

City	Distance	Date	Difference
Chelyabinsk	261 km	24 May – 14 June	1 day earlier
Kurgan	273 km	29 May – 11 June	4 days later
Magnitogorsk	307 km	26 May – 6 June	1 day later
Kokshetau	384 km	16 May – 9 June	9 days earlier
Petropavl	405 km	26 May – 9 June	1 day later
Yekaterinburg	447 km	28 May – 8 June	3 days later

Where to buy tomato plants and seeds near Kostanay

Buy plants ready to set out from 25 May to 12 June (from 4 May to 12 June for an unheated greenhouse); seed for raising your own is sown from 13 March to 21 April. Within 15 km of Kostanay OpenStreetMap lists 3 garden centres, 10 markets and 1 farm shop (collected 27 October 2026).

Invent.kz — garden centre
Рабочая көшесі 165, Қостанай · 3 km · invent.kz
Садовод — garden centre
улица Воинов-Интернационалистов 8б · 3 km
Усадьба — garden centre
улица Тауелсиздик 51/1, 111100 · 5 km
Береке — market
Шевченко көшесі 37 · 2 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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