When to plant tomatoes in Río Cuarto: 15 September – 22 February

In Río Cuarto, tomato: sow for seedlings from 4 July to 1 January; plant into a greenhouse from 25 August to 22 February; plant out into open ground from 15 September to 22 February.

Tomato in Río Cuarto: soil, season and weather

In Río Cuarto the soil, not frost, sets the date: the last frost is over around 15 August, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 15 September, 31 days later.

Last spring frost	15 August
Top 7 cm of soil at 15 °C	15 September, 31 days after the last frost
Into an unheated greenhouse	25 August – 22 February; August outside: 6.9 °C at night, 18.3 °C by day; card 16–27 °C
First autumn frost	13 June, 272 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	24 November – 2 May
Days left for picking	202
Daylight	10:20 on 25 July, 11:52 on 15 September
Watering outdoors when fruiting (card)	every 3 days; the driest month, June, has 2 rainy days

Tomato in Río Cuarto: care after planting

Planted on 15 September: in the first weeks water every 4 days.

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

15 September — feed: balanced (NPK)
13 October — 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 Río Cuarto during the tomato season

Days average above the tomato card's 16–27 °C in November–February (27.4–29.7 °C). Months that stay below 16 °C even by day on average: June (15.5 °C). Nights average below 16 °C in April–June and September–November (5.9–15.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
September	21.3	9.6	24	4	11:52
October	24.1	12.4	91	9	12:52
November	27.4	15.8	81	9	13:49
December	29.6	18	74	9	14:19
January	29.7	19.3	113	11	14:06
February	28.3	18.5	96	9	13:16
March	26.1	16.7	106	10	12:20
April	22.3	13.2	68	8	11:17
May	18.1	9.2	28	5	10:26
June	15.5	5.9	14	2	9:58

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Río Cuarto, Santa Fe is 47 days earlier and Santa Rosa 7 days later.

City	Distance	Date	Difference
San Luis	184 km	31 August – 2 March	15 days earlier
Córdoba	191 km	31 August – 23 February	15 days earlier
Rosario	346 km	15 August – 23 February	31 days earlier
Santa Fe	379 km	from 30 July	47 days earlier
Santa Rosa	388 km	22 September – 21 February	7 days later
Paraná	391 km	from 30 July	47 days earlier

Where to buy tomato plants and seeds near Río Cuarto

Buy plants ready to set out from 15 September to 22 February (from 25 August to 22 February for an unheated greenhouse); seed for raising your own is sown from 4 July to 1 January. Within 15 km of Río Cuarto OpenStreetMap lists 2 garden centres, 1 plant nursery, 3 markets and 1 farm shop (collected 27 October 2026).

Punta del agua — market
Avenida Marcelo T. de Alvear, 5800 · 4 km
Unigarden — garden centre
5 km
El Tocón — garden centre
7 km
Vivero — plant nursery
5 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