When to plant tomatoes in Colonia del Sacramento: from 19 August

In Colonia del Sacramento, tomato: sow for seedlings from 7 June; plant into a greenhouse from 29 July; plant out into open ground from 19 August. There is no autumn frost here, so the frost dates set no end to the window.

Tomato in Colonia del Sacramento: soil, season and weather

In Colonia del Sacramento the soil, not frost, sets the date: the last frost is over around 9 July, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 19 August, 41 days later. Colonia del Sacramento has no autumn frost in the median year, so frost does not end the season.

Last spring frost	9 July
Top 7 cm of soil at 15 °C	19 August, 41 days after the last frost
Into an unheated greenhouse	from 29 July; July outside: 8 °C at night, 14.8 °C by day; card 16–27 °C
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	from 28 October
Daylight	9:52 on 28 June, 10:56 on 19 August
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 7 rainy days

Tomato in Colonia del Sacramento: care after planting

Planted on 19 August: in the first weeks water every 4 days.

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

19 August — feed: balanced (NPK)
16 September — 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 Colonia del Sacramento during the tomato season

Days average above the tomato card's 16–27 °C in December (27.5 °C) and January (28.9 °C). Nights average below 16 °C in August (9 °C), September (10.8 °C) and October (13.2 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
August	16.8	9	73	7	10:49
September	18.6	10.8	72	7	11:51
October	21.3	13.2	96	10	12:55
November	25	16.2	86	8	13:55
December	27.5	18.5	81	8	14:26
January	28.9	20.5	80	10	14:12

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Colonia del Sacramento, Salto is 26 days earlier and La Plata 31 days later.

City	Distance	Date	Difference
La Plata	51 km	19 September – 25 February	31 days later
Buenos Aires	52 km	from 2 September	14 days later
Paysandú	240 km	27 July – 6 March	23 days earlier
Maldonado	269 km	from 10 September	22 days later
Rosario	309 km	15 August – 23 February	4 days earlier
Salto	344 km	from 24 July	26 days earlier

Where to buy tomato plants and seeds near Colonia del Sacramento

Buy plants ready to set out from 19 August (from 29 July for an unheated greenhouse); seed for raising your own is sown from 7 June. Within 15 km of Colonia del Sacramento OpenStreetMap lists 1 garden centre and 1 farm-supply shop (collected 28 October 2026).

Vivero — garden centre
4 km
Agro Jardín Colonia — farm supply
0 km

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