When to plant watermelons in Tomsk: 17 June – 18 June

In Tomsk, watermelon: sow for seedlings from 29 April to 21 May; plant into a greenhouse from 27 May to 18 June; plant out into open ground from 17 June to 18 June. For plants and seeds, the places nearby include Томскагроснаб (farm supply, 2 km) and Семена фирма Поле (garden centre, 3 km); addresses and opening hours are below.

Watermelon in Tomsk: soil, season and weather

In Tomsk the soil, not frost, sets the date: the last frost is over around 20 May, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 17 June, 28 days later. 102 days separate planting out (17 June) from the first autumn frost (27 September); the card's 59 days to the first harvest leave 43 for picking, so a start 6 weeks late would still fit.

Last spring frost	20 May
Top 7 cm of soil at 18 °C	17 June, 28 days after the last frost
Into an unheated greenhouse	27 May – 18 June; May outside: 4.2 °C at night, 15.4 °C by day; card 18–35 °C
First autumn frost	27 September, 102 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	15 August – 16 August
Days left for picking	43
Daylight	16:41 on 20 May, 17:44 on 17 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, September, has 12 rainy days

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

Watermelon in Tomsk: care after planting

Planted on 17 June: in the first weeks water every 5 days.

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

17 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 Tomsk during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 23.7 °C. Months that stay below 18 °C even by day on average: September (14.5 °C). Nights average below 18 °C in every month of the season, from 5.6 °C to 14.5 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	22.8	12.5	58	11	17:43
July	23.7	14.5	76	13	17:10
August	21.5	12.1	68	13	15:13
September	14.5	5.6	55	12	12:50

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Tomsk, Pavlodar is 21 days earlier and Krasnoyarsk 1 day later.

City	Distance	Date	Difference
Kemerovo	146 km	13 June – 17 June	4 days earlier
Novosibirsk	208 km	13 June – 19 June	4 days earlier
Novokuznetsk	334 km	14 June – 21 June	3 days earlier
Barnaul	359 km	8 June – 20 June	9 days earlier
Krasnoyarsk	489 km	18 June – 18 June	1 day later
Pavlodar	698 km	27 May – 25 June	21 days earlier

Where to buy watermelon plants and seeds near Tomsk

Buy plants ready to set out from 17 June to 18 June (from 27 May to 18 June for an unheated greenhouse); seed for raising your own is sown from 29 April to 21 May. Within 15 km of Tomsk OpenStreetMap lists 4 garden centres, 1 farm-supply shop, 2 plant nurseries, 13 markets and 2 farm shops (collected 27 October 2026).

Семена фирма Поле — garden centre
Mon, Sat 09:00–17:00; Tue–Fri 09:00–18:00; Sun 09:00–16:00 · 3 km
Томскагроснаб — farm supply
Mon–Fri 09:00–18:00; Sat 09:00–14:00 · 2 km
Центральный рынок — market
улица Карла Маркса 48, 634009 Томск · Tue–Sun 08:00–18:00 · 2 km
Фрунзенский рынок — market
Комсомольский проспект 58 стр. 1 · 09:00–20:00 · 3 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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