When to plant tomatoes in Kostroma: 28 May – 21 June

In Kostroma, tomato: sow for seedlings from 16 March to 30 April; plant into a greenhouse from 7 May to 21 June; plant out into open ground from 28 May to 21 June. For plants and seeds, the places nearby include Десяточка экспресс (farm shop, 2 km); addresses and opening hours are below.

Tomato in Kostroma: soil, season and weather

In Kostroma the soil, not frost, sets the date: the last frost is over around 6 May, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 28 May, 22 days later.

Last spring frost	6 May
Top 7 cm of soil at 15 °C	28 May, 22 days after the last frost
Into an unheated greenhouse	7 May – 21 June; May outside: 5.8 °C at night, 16.3 °C by day; card 16–27 °C
First autumn frost	11 October, 136 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	6 August – 30 August
Days left for picking	66
Daylight	13:34 on 6 April, 17:25 on 28 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 11 rainy days

Tomato in Kostroma: care after planting

Planted on 28 May: in the first weeks water every 4 days.

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

28 May — feed: balanced (NPK)
25 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 Kostroma during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 23.4 °C. Months that stay below 16 °C even by day on average: September (15.6 °C) and October (8 °C). Nights average below 16 °C in every month of the season, from 2.4 °C to 14.1 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	16.3	5.8	62	11	16:37
June	20.8	11	78	12	18:04
July	23.4	14.1	82	14	17:28
August	21.9	12.6	63	11	15:23
September	15.6	7.8	56	11	12:53
October	8	2.4	63	14	10:25

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Kostroma, Ivanovo is 2 days earlier and Cherepovets 6 days later.

City	Distance	Date	Difference
Yaroslavl	65 km	27 May – 20 June	1 day earlier
Ivanovo	86 km	26 May – 21 June	2 days earlier
Vologda	172 km	27 May – 20 June	1 day earlier
Vladimir	184 km	26 May – 25 June	2 days earlier
Cherepovets	232 km	3 June – 27 June	6 days later
Nizhny Novgorod	245 km	27 May – 28 June	1 day earlier

Where to buy tomato plants and seeds near Kostroma

Buy plants ready to set out from 28 May to 21 June (from 7 May to 21 June for an unheated greenhouse); seed for raising your own is sown from 16 March to 30 April. Within 15 km of Kostroma OpenStreetMap lists 2 garden centres, 2 markets and 1 farm shop (collected 27 October 2026).

Ярмарка Купеческое подворье — market
Mon–Sun 09:00–21:00 · 2 km
Десяточка экспресс — farm shop
Московская улица 19, 156001 Кострома · Mon–Sun 08:00–22:00 · 2 km
Сияние — garden centre
0 km
Дачник — garden centre
1 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.

Questions