When to plant tomatoes in Alcázar de San Juan: 1 April – 12 August

In Alcázar de San Juan, tomato: sow for seedlings from 18 January to 21 June; plant into a greenhouse from 11 March to 12 August; plant out into open ground from 1 April to 12 August.

Tomato in Alcázar de San Juan: soil, season and weather

In Alcázar de San Juan the soil, not frost, sets the date: the last frost is over around 15 March, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 1 April, 17 days later.

Last spring frost	15 March
Top 7 cm of soil at 15 °C	1 April, 17 days after the last frost
Into an unheated greenhouse	11 March – 12 August; March outside: 4.9 °C at night, 15.7 °C by day; card 16–27 °C
First autumn frost	2 December, 245 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	10 June – 21 October
Days left for picking	175
Daylight	10:27 on 8 February, 12:38 on 1 April
Watering outdoors when fruiting (card)	every 3 days; the driest month, July, has 1 rainy day

Tomato in Alcázar de San Juan: care after planting

Planted on 1 April: in the first weeks water every 4 days.

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

1 April — feed: balanced (NPK)
29 April — 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 Alcázar de San Juan during the tomato season

Days average above the tomato card's 16–27 °C in June–September (27.7–35 °C). Months that stay below 16 °C even by day on average: November (14.6 °C) and December (11.5 °C). Nights average below 16 °C in April, May and September–December (3–15.5 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	19.1	7.6	57	10	13:13
May	24.7	11.9	29	5	14:19
June	30.6	17.1	19	4	14:56
July	35	20.6	3	1	14:42
August	34.2	20.4	8	1	13:45
September	27.7	15.5	25	4	12:29
October	22.4	11.4	52	7	11:13
November	14.6	5.7	45	8	10:02
December	11.5	3	36	6	9:25

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

All the nearest cities on our list plant tomato later than Alcázar de San Juan; the closest date is in Ciudad Real, 12 days later.

City	Distance	Date	Difference
Ciudad Real	76 km	13 April – 8 August	12 days later
Toledo	88 km	14 April – 16 August	13 days later
Cuenca (Spain)	119 km	8 May – 24 July	37 days later
Madrid	122 km	26 April – 7 August	25 days later
Albacete	125 km	29 April – 6 August	28 days later
Guadalajara (Spain)	138 km	29 April – 4 August	28 days later

Where to buy tomato plants and seeds near Alcázar de San Juan

Buy plants ready to set out from 1 April to 12 August (from 11 March to 12 August for an unheated greenhouse); seed for raising your own is sown from 18 January to 21 June. Within 15 km of Alcázar de San Juan OpenStreetMap lists 1 garden centre and 1 market (collected 28 October 2026).

Fertyvicam Sl — garden centre
6 km
Mercado Municipal — market
0 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