When to plant eggplants in Kostroma: 18 June – 21 June

In Kostroma, eggplant: sow for seedlings from 29 March to 22 April; plant into a greenhouse from 28 May to 21 June; plant out into open ground from 18 June to 21 June.

Eggplant 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 18 °C — the minimum on the eggplant card — only around 18 June, 43 days later. 115 days separate planting out (18 June) from the first autumn frost (11 October); the card's 70 days to the first harvest leave 45 for picking, so a start 6 weeks late would still fit.

Last spring frost	6 May
Top 7 cm of soil at 18 °C	18 June, 43 days after the last frost
Into an unheated greenhouse	28 May – 21 June; May outside: 5.8 °C at night, 16.3 °C by day; card 21–29 °C
First autumn frost	11 October, 115 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	27 August – 30 August
Days left for picking	45
Daylight	14:38 on 19 April, 18:06 on 18 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 11 rainy days

The same dates in Kostroma hold for Cucumber, Bell Pepper, Zucchini, Pumpkin and Watermelon.

Eggplant in Kostroma: care after planting

Planted on 18 June: in the first weeks water every 4 days.

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

18 June — feed: balanced (NPK)
16 July — feed: nitrogen

Pests and diseases of eggplant 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 eggplant season

No month of the season averages above the eggplant card's 21–29 °C by day; the warmest, July, averages 23.4 °C. Months that stay below 21 °C even by day on average: June (20.8 °C), September (15.6 °C) and October (8 °C). Nights average below 21 °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
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

Eggplant in nearby cities

Around Kostroma, Nizhny Novgorod is 16 days earlier and Vologda 4 days later.

City	Distance	Date	Difference
Yaroslavl	65 km	15 June – 20 June	3 days earlier
Ivanovo	86 km	15 June – 21 June	3 days earlier
Vologda	172 km	22 June – 1 August	4 days later
Vladimir	184 km	13 June – 25 June	5 days earlier
Cherepovets	232 km	22 June – 27 June	4 days later
Nizhny Novgorod	245 km	2 June – 28 June	16 days earlier

Where to buy eggplant plants and seeds near Kostroma

Buy plants ready to set out from 18 June to 21 June (from 28 May to 21 June for an unheated greenhouse); seed for raising your own is sown from 29 March to 22 April. Within 15 km of Kostroma OpenStreetMap lists 2 garden centres, 2 markets and 1 farm shop (collected 27 October 2026).

Сияние — garden centre
0 km
Дачник — garden centre
1 km
Ярмарка на Островского — market
1 km
Ярмарка Купеческое подворье — market
Mon–Sun 09:00–21:00 · 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.

Questions