When to plant tomatoes in Sapporo: 30 June – 8 August

In Sapporo, tomato: sow for seedlings from 18 April to 17 June; plant into a greenhouse from 9 June to 8 August; plant out into open ground from 30 June to 8 August. For plants and seeds, the places nearby include 萩野農園野菜直売所果菜園 (farm shop, 13 km); addresses and opening hours are below.

Tomato in Sapporo: soil, season and weather

In Sapporo the soil, not frost, sets the date: the last frost is over around 9 May, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 30 June, 52 days later. 109 days separate planting out (30 June) from the first autumn frost (17 October); the card's 70 days to the first harvest leave 39 for picking, so a start 5 weeks late would still fit.

Last spring frost	9 May
Top 7 cm of soil at 15 °C	30 June, 52 days after the last frost
Into an unheated greenhouse	9 June – 8 August; June outside: 9.6 °C at night, 17.8 °C by day; card 16–27 °C
First autumn frost	17 October, 109 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	8 September – 17 October
Days left for picking	39
Daylight	14:25 on 9 May, 15:20 on 30 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, October, has 14 rainy days

Tomato in Sapporo: care after planting

Planted on 30 June: in the first weeks water every 4 days.

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

30 June — feed: balanced (NPK)
28 July — 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 Sapporo during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 22.3 °C. Months that stay below 16 °C even by day on average: October (10.9 °C). Nights average below 16 °C in every month of the season, from 3.3 °C to 15.2 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	17.8	9.6	133	16	15:21
July	22.3	14.8	151	16	15:04
August	22.1	15.2	200	17	13:59
September	18.1	10.6	139	13	12:33
October	10.9	3.3	120	14	11:06

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

All the nearest cities on our list plant tomato earlier than Sapporo; the closest date is in Vladivostok, 14 days earlier.

City	Distance	Date	Difference
Sendai	534 km	13 May – 3 August	48 days earlier
Niigata	604 km	5 May – 30 August	56 days earlier
Vladivostok	768 km	16 June – 16 July	14 days earlier
Khabarovsk	774 km	29 May – 26 June	32 days earlier
Tokyo	832 km	4 April – 24 August	87 days earlier
Nagoya	956 km	12 April – 20 August	79 days earlier

Where to buy tomato plants and seeds near Sapporo

Buy plants ready to set out from 30 June to 8 August (from 9 June to 8 August for an unheated greenhouse); seed for raising your own is sown from 18 April to 17 June. Within 15 km of Sapporo OpenStreetMap lists 2 garden centres, 1 farm-supply shop, 2 markets and 3 farm shops (collected 28 October 2026).

Nijo Market — market
Mon–Sun 07:00–18:00 · 1 km · nijomarket.com
萩野農園野菜直売所果菜園 — farm shop
09:00–19:00 · 13 km
Joyful AK — garden centre
9 km
ヤマグチガーデン — garden centre
4 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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