When to plant tomatoes in Santa Rosa: 22 September – 21 February

In Santa Rosa, tomato: sow for seedlings from 11 July to 31 December; plant into a greenhouse from 1 September to 21 February; plant out into open ground from 22 September to 21 February. For plants and seeds, the places nearby include Vivero Forestal Provincial Santa Rosa (plant nursery, 3 km) and YPF Agro (farm supply, 5 km); addresses and opening hours are below.

Tomato in Santa Rosa: soil, season and weather

In Santa Rosa the soil, not frost, sets the date: the last frost is over around 25 August, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 22 September, 28 days later.

Last spring frost	25 August
Top 7 cm of soil at 15 °C	22 September, 28 days after the last frost
Into an unheated greenhouse	1 September – 21 February; September outside: 8.1 °C at night, 19.5 °C by day; card 16–27 °C
First autumn frost	12 June, 264 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	1 December – 1 May
Days left for picking	194
Daylight	10:17 on 1 August, 12:06 on 22 September
Watering outdoors when fruiting (card)	every 3 days; the driest month, June, has 3 rainy days

Tomato in Santa Rosa: care after planting

Planted on 22 September: in the first weeks water every 4 days.

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

22 September — feed: balanced (NPK)
20 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 Santa Rosa during the tomato season

Days average above the tomato card's 16–27 °C in December (29.6 °C), January (30.5 °C) and February (29 °C). Months that stay below 16 °C even by day on average: June (13.6 °C). Nights average below 16 °C in March–June and September–November (4.6–15.2 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
September	19.5	8.1	49	6	11:50
October	22.4	10.7	66	7	12:59
November	26.3	14.3	75	8	14:04
December	29.6	17	64	7	14:39
January	30.5	18.8	59	8	14:23
February	29	17.7	77	7	13:26
March	25.6	15.2	90	8	12:22
April	21.1	11.7	76	7	11:10
May	16.5	7.7	29	5	10:12
June	13.6	4.6	17	3	9:40

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Santa Rosa, Rosario is 38 days earlier and Bahía Blanca 1 day later.

City	Distance	Date	Difference
Bahía Blanca	293 km	23 September – 23 February	1 day later
Río Cuarto	388 km	15 September – 22 February	7 days earlier
San Luis	414 km	31 August – 2 March	22 days earlier
Neuquén	421 km	22 September – 17 February	same day
San Rafael	428 km	11 September – 13 February	11 days earlier
Rosario	527 km	15 August – 23 February	38 days earlier

Where to buy tomato plants and seeds near Santa Rosa

Buy plants ready to set out from 22 September to 21 February (from 1 September to 21 February for an unheated greenhouse); seed for raising your own is sown from 11 July to 31 December. Within 15 km of Santa Rosa OpenStreetMap lists 2 garden centres, 4 farm-supply shops, 2 plant nurseries and 1 market (collected 28 October 2026).

Vivero Forestal Provincial Santa Rosa — plant nursery
Eva Perón Este, L6300 Santa Rosa · Mon–Fri 08:00–12:30 · 3 km
YPF Agro — farm supply
Avenida Juan Manuel de Rosas, L6300 Santa Rosa · 5 km
Grupo Ruta 14 — farm supply
Ruta Provincial 14, L6303 Toay · 13 km
Mercado Concentrador de Santa Rosa — market
Avenida Eva Perón, L6300 Santa Rosa · Mon 06:00–14:00; Tue–Fri 12:00–18:00 · 3 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.

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