When to plant tomatoes in Viseu: 27 April – 20 August

In Viseu, tomato: sow for seedlings from 13 February to 29 June; plant into a greenhouse from 6 April to 20 August; plant out into open ground from 27 April to 20 August. For plants and seeds, the places nearby include Agriloja (farm supply, 2 km); addresses and opening hours are below.

Tomato in Viseu: soil, season and weather

In Viseu the soil, not frost, sets the date: the last frost is over around 7 February, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 27 April, 79 days later.

Last spring frost	7 February
Top 7 cm of soil at 15 °C	27 April, 79 days after the last frost
Into an unheated greenhouse	6 April – 20 August; April outside: 7.6 °C at night, 17.8 °C by day; card 16–27 °C
First autumn frost	10 December, 227 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	6 July – 29 October
Days left for picking	157
Daylight	11:29 on 6 March, 13:46 on 27 April
Watering outdoors when fruiting (card)	every 3 days; the driest month, July, has 2 rainy days

Tomato in Viseu: care after planting

Planted on 27 April: in the first weeks water every 4 days.

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

27 April — feed: balanced (NPK)
25 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 Viseu during the tomato season

Days average above the tomato card's 16–27 °C in July (29.1 °C) and August (30 °C). Months that stay below 16 °C even by day on average: November (15 °C) and December (12.8 °C). Nights average below 16 °C in every month of the season, from 5.1 °C to 15.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	17.8	7.6	122	13	13:16
May	21.3	10.2	73	11	14:26
June	24.6	13.1	49	8	15:04
July	29.1	15.6	9	2	14:49
August	30	15.9	9	2	13:49
September	25.4	13.6	57	6	12:30
October	21.2	11.6	152	12	11:11
November	15	7.2	156	14	9:57
December	12.8	5.1	153	13	9:17

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Viseu, Castelo Branco is 25 days earlier and Guarda 12 days later.

City	Distance	Date	Difference
Guarda	56 km	9 May – 5 August	12 days later
Coimbra	67 km	from 9 April	18 days earlier
Vila Real	73 km	13 April – 1 September	14 days earlier
Porto	80 km	15 April – 29 August	12 days earlier
Castelo Branco	100 km	2 April – 5 September	25 days earlier
Braga	108 km	13 April – 2 September	14 days earlier

Where to buy tomato plants and seeds near Viseu

Buy plants ready to set out from 27 April to 20 August (from 6 April to 20 August for an unheated greenhouse); seed for raising your own is sown from 13 February to 29 June. Within 15 km of Viseu OpenStreetMap lists 1 garden centre, 6 farm-supply shops and 4 markets (collected 27 October 2026).

Agriloja — farm supply
Avenida dos Namorados, 3510-674 Viseu · Mon–Sat 08:30–20:00; Sun 09:00–13:00 · 2 km · agriloja.pt
Largo da feira semanal — market
Tue–Mon · 0 km
Viseu Garden Centre — garden centre
2 km
Loja do Lavrador — farm supply
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