When to plant tomatoes in Bahía Blanca: 23 September – 23 February

In Bahía Blanca, tomato: sow for seedlings from 12 July to 2 January; plant into a greenhouse from 2 September to 23 February; plant out into open ground from 23 September to 23 February. For plants and seeds, the places nearby include Vivero Caronti (garden centre, 1 km) and JL (garden centre, 2 km); addresses and opening hours are below.

Tomato in Bahía Blanca: soil, season and weather

In Bahía Blanca the soil, not frost, sets the date: the last frost is over around 8 August, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 23 September, 46 days later.

Last spring frost	8 August
Top 7 cm of soil at 15 °C	23 September, 46 days after the last frost
Into an unheated greenhouse	2 September – 23 February; September outside: 8.3 °C at night, 18.3 °C by day; card 16–27 °C
First autumn frost	14 June, 265 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	2 December – 3 May
Days left for picking	195
Daylight	10:10 on 2 August, 12:08 on 23 September
Watering outdoors when fruiting (card)	every 3 days; the driest month, June, has 5 rainy days

Tomato in Bahía Blanca: care after planting

Planted on 23 September: in the first weeks water every 4 days.

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

23 September — feed: balanced (NPK)
21 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 Bahía Blanca during the tomato season

Days average above the tomato card's 16–27 °C in December (28.8 °C), January (30.4 °C) and February (28.6 °C). Months that stay below 16 °C even by day on average: June (13.4 °C). Nights average below 16 °C in March–June and September–November (5.8–15.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
September	18.3	8.3	44	6	11:48
October	21.2	11	55	7	13:03
November	25	14.2	71	7	14:13
December	28.8	16.8	54	6	14:51
January	30.4	19.1	53	6	14:34
February	28.6	18	48	7	13:33
March	25.7	15.8	80	7	12:23
April	21	12.3	63	7	11:06
May	16.2	8.4	46	6	10:03
June	13.4	5.8	29	5	9:28

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Bahía Blanca, Buenos Aires is 21 days earlier and Mar del Plata 25 days later.

City	Distance	Date	Difference
Santa Rosa	293 km	22 September – 21 February	1 day earlier
Mar del Plata	418 km	from 18 October	25 days later
Neuquén	502 km	22 September – 17 February	1 day earlier
Trelew	565 km	7 October – 6 February	14 days later
La Plata	571 km	19 September – 25 February	4 days earlier
Buenos Aires	575 km	from 2 September	21 days earlier

Where to buy tomato plants and seeds near Bahía Blanca

Buy plants ready to set out from 23 September to 23 February (from 2 September to 23 February for an unheated greenhouse); seed for raising your own is sown from 12 July to 2 January. Within 15 km of Bahía Blanca OpenStreetMap lists 9 garden centres and 4 markets (collected 27 October 2026).

Forrajería y vivero Don Bosco — garden centre
Don Bosco 2583, Bahía Blanca · Mon–Sat 09:00–13:30, 16:00–20:00 · 4 km · facebook.com
Cultivos Bahía Blanca — garden centre
Florida 4500, 8000 Bahía Blanca · Mon–Fri 09:00–12:00, 15:00–18:00; Sat 09:00–12:00 · 6 km · cultivosbahiablanca.com.ar
Vivero Caronti — garden centre
Caronti 91, 8000 Bahía Blanca · Mon–Fri 09:00–13:00, 16:00–20:00; Sat 09:00–13:00 · 1 km
JL — garden centre
Patricios 1210, Bahía Blanca · 2 km · facebook.com

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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