When to plant tomatoes in Viana do Castelo: 2 May – 22 August

In Viana do Castelo, tomato: sow for seedlings from 18 February to 1 July; plant into a greenhouse from 11 April to 22 August; plant out into open ground from 2 May to 22 August.

Tomato in Viana do Castelo: soil, season and weather

In Viana do Castelo the soil, not frost, sets the date: the last frost is over around 3 February, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 2 May, 88 days later.

Last spring frost	3 February
Top 7 cm of soil at 15 °C	2 May, 88 days after the last frost
Into an unheated greenhouse	11 April – 22 August; April outside: 7.6 °C at night, 16.4 °C by day; card 16–27 °C
First autumn frost	12 December, 224 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	11 July – 31 October
Days left for picking	154
Daylight	11:42 on 11 March, 14:02 on 2 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, July, has 4 rainy days

Tomato in Viana do Castelo: care after planting

Planted on 2 May: in the first weeks water every 4 days.

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

2 May — feed: balanced (NPK)
30 May — 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 Viana do Castelo during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, August, averages 24.8 °C. Months that stay below 16 °C even by day on average: November (14.5 °C) and December (12.7 °C). Nights average below 16 °C in every month of the season, from 5.7 °C to 14.8 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19.1	10	128	11	14:31
June	21.1	12.6	77	10	15:11
July	24.4	14.8	22	4	14:55
August	24.8	14.8	33	4	13:53
September	22.4	13.1	95	9	12:31
October	19.2	11.2	268	13	11:09
November	14.5	7.7	265	16	9:52
December	12.7	5.7	272	16	9:11

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Viana do Castelo, Vigo is 27 days earlier and Ourense 10 days later.

City	Distance	Date	Difference
Braga	37 km	13 April – 2 September	19 days earlier
Vigo	61 km	from 5 April	27 days earlier
Porto	63 km	15 April – 29 August	17 days earlier
Pontevedra	84 km	from 21 April	11 days earlier
Vila Real	101 km	13 April – 1 September	19 days earlier
Ourense	108 km	12 May – 13 August	10 days later

Where to buy tomato plants and seeds near Viana do Castelo

Buy plants ready to set out from 2 May to 22 August (from 11 April to 22 August for an unheated greenhouse); seed for raising your own is sown from 18 February to 1 July. Within 15 km of Viana do Castelo OpenStreetMap lists 1 farm-supply shop, 1 plant nursery and 3 markets (collected 27 October 2026).

Mercado Municipal de Vila Praia de Âncora — market
Mon, Tue, Wed, Fri, Sat 08:00–18:00; Thu 07:00–18:00 · 14 km
Viveiro — plant nursery
5 km
Casa do Lavrador — farm supply
14 km
Mercado Municipal — market
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