When to plant tomatoes in Santa Maria: 23 July – 21 February

In Santa Maria, tomato: sow for seedlings from 11 May to 31 December; plant into a greenhouse from 2 July to 21 February; plant out into open ground from 23 July to 21 February. For plants and seeds, the places nearby include Portal Arco-Íris (garden centre, 4 km) and Agroleo (farm supply, 6 km); addresses and opening hours are below.

Tomato in Santa Maria: soil, season and weather

In Santa Maria frost, not soil, sets the date: the top 7 cm of soil warms to 15 °C — the minimum on the tomato card — around 16 July, 0 days before the last frost on 16 July, so planting waits only for the week after that frost.

Last spring frost	16 July
Top 7 cm of soil at 15 °C	16 July, the day of the last frost
Into an unheated greenhouse	2 July – 21 February; July outside: 9.8 °C at night, 19.3 °C by day; card 16–27 °C
First autumn frost	12 June, 325 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	1 October – 1 May
Days left for picking	255
Daylight	10:22 on 1 June, 10:32 on 23 July
Watering outdoors when fruiting (card)	every 3 days; the driest month, February, has 10 rainy days

Tomato in Santa Maria: care after planting

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

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

23 July — feed: balanced (NPK)
20 August — 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 Maria during the tomato season

Days average above the tomato card's 16–27 °C in November–March (27.3–30.6 °C). Nights average below 16 °C in May–October (9.8–14.6 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
July	19.3	9.8	120	9	10:24
August	20.8	10.6	127	9	11:02
September	22.6	13	193	13	11:53
October	24.5	14.6	173	12	12:46
November	27.3	16.5	132	10	13:36
December	29.8	19	110	11	14:02
January	30.6	20.6	113	12	13:51
February	30.1	20.1	91	10	13:07
March	28.3	18.7	138	10	12:18
April	25.2	16.1	131	9	11:23
May	20.8	12.5	196	12	10:39
June	19.2	10.5	141	9	10:15

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Santa Maria, Caxias do Sul is 3 days earlier and Chapecó 18 days later.

City	Distance	Date	Difference
Passo Fundo	209 km	26 July – 26 February	3 days later
Rivera	214 km	6 August – 18 February	14 days later
Caxias do Sul	261 km	20 July – 25 February	3 days earlier
Tacuarembó	307 km	28 July – 22 February	5 days later
Chapecó	310 km	10 August – 3 March	18 days later
Posadas	328 km	from 25 July	2 days later

Where to buy tomato plants and seeds near Santa Maria

Buy plants ready to set out from 23 July to 21 February (from 2 July to 21 February for an unheated greenhouse); seed for raising your own is sown from 11 May to 31 December. Within 15 km of Santa Maria OpenStreetMap lists 1 garden centre, 4 farm-supply shops, 1 plant nursery and 5 markets (collected 27 October 2026).

Portal Arco-Íris — garden centre
Avenida João Luiz Pozzobon 1025, 97095-465 · 4 km
Agroleo — farm supply
Rua Ismael Barcellos Neto 479, 97061-028 · 6 km
Agropecuária Fronteira — farm supply
Rua Evaristo Menezes dos Santos 55, 97061-042 · 6 km
PoliFeira do Agricultor — market
Rua Barão do Triunfo, Santa Maria · Tue 12:00–17:30 · 1 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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