When to plant watermelons in Kaluga: 12 June – 2 July

In Kaluga, watermelon: sow for seedlings from 24 April to 4 June; plant into a greenhouse from 22 May to 2 July; plant out into open ground from 12 June to 2 July.

Watermelon in Kaluga: soil, season and weather

In Kaluga the soil, not frost, sets the date: the last frost is over around 28 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 12 June, 45 days later.

Last spring frost	28 April
Top 7 cm of soil at 18 °C	12 June, 45 days after the last frost
Into an unheated greenhouse	22 May – 2 July; May outside: 7 °C at night, 17.6 °C by day; card 18–35 °C
First autumn frost	11 October, 121 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	10 August – 30 August
Days left for picking	62
Daylight	16:02 on 15 May, 17:11 on 12 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, September, has 8 rainy days

The same dates in Kaluga hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Kaluga: care after planting

Planted on 12 June: in the first weeks water every 5 days.

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

12 June — feed: balanced (NPK)

Pests and diseases of watermelon 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 Kaluga during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 23.9 °C. Months that stay below 18 °C even by day on average: September (17.6 °C) and October (10.2 °C). Nights average below 18 °C in every month of the season, from 3.5 °C to 14.7 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	22.4	12.3	73	12	17:14
July	23.9	14.7	83	14	16:45
August	23.5	13.6	54	11	14:58
September	17.6	8.8	45	8	12:47
October	10.2	3.5	60	12	10:36

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Kaluga, Ryazan is 6 days earlier and Tver 4 days later.

City	Distance	Date	Difference
Tula	95 km	14 June – 6 July	2 days later
Moscow	161 km	14 June – 5 July	2 days later
Oryol	174 km	11 June – 7 July	1 day earlier
Bryansk	190 km	11 June – 11 July	1 day earlier
Ryazan	221 km	6 June – 14 July	6 days earlier
Tver	260 km	16 June – 1 July	4 days later

Where to buy watermelon plants and seeds near Kaluga

Buy plants ready to set out from 12 June to 2 July (from 22 May to 2 July for an unheated greenhouse); seed for raising your own is sown from 24 April to 4 June. Within 15 km of Kaluga OpenStreetMap lists 19 garden centres, 1 plant nursery, 11 markets and 1 farm shop (collected 27 October 2026).

Ярмарка «Турынино» — market
6 km
Сельскохозяйственный рынок — market
7 km
Мини-рынок — market
8 km
Крестьянский дворик — farm shop
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