When to plant tomatoes in Rancagua: 17 October – 20 February

In Rancagua, tomato: sow for seedlings from 5 August to 30 December; plant into a greenhouse from 26 September to 20 February; plant out into open ground from 17 October to 20 February. For plants and seeds, the places nearby include Jardín Rosal de Las Mercedes (garden centre, 11 km) and Vivero Karü (garden centre, 11 km); addresses and opening hours are below.

Tomato in Rancagua: soil, season and weather

In Rancagua the soil, not frost, sets the date: the last frost is over around 18 August, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 17 October, 60 days later.

Last spring frost	18 August
Top 7 cm of soil at 15 °C	17 October, 60 days after the last frost
Into an unheated greenhouse	26 September – 20 February; September outside: 6.7 °C at night, 17.6 °C by day; card 16–27 °C
First autumn frost	11 June, 238 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	26 December – 30 April
Days left for picking	168
Daylight	11:10 on 26 August, 12:58 on 17 October
Watering outdoors when fruiting (card)	every 3 days; the driest month, December, has 1 rainy day

Tomato in Rancagua: care after planting

Planted on 17 October: in the first weeks water every 4 days.

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

17 October — feed: balanced (NPK)
14 November — 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 Rancagua during the tomato season

Days average above the tomato card's 16–27 °C in December–March (27.1–29.6 °C). Months that stay below 16 °C even by day on average: June (13.9 °C). Nights average below 16 °C in every month of the season, from 5.1 °C to 14.6 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
October	20.9	8.6	43	5	12:54
November	25.1	10.8	27	3	13:53
December	28.2	12.9	5	1	14:25
January	29.6	14.5	10	1	14:11
February	29.5	14.6	9	2	13:19
March	27.1	12.6	8	1	12:20
April	21.4	9.9	61	4	11:15
May	16.7	7.4	71	8	10:22
June	13.9	5.1	149	9	9:53

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

All the nearest cities on our list plant tomato earlier than Rancagua; the closest date is in Curicó, 2 days earlier.

City	Distance	Date	Difference
Santiago	80 km	23 September – 26 February	24 days earlier
Curicó	102 km	15 October – 15 February	2 days earlier
Valparaíso	149 km	from 26 September	21 days earlier
Talca	162 km	15 October – 21 February	2 days earlier
San Rafael	226 km	11 September – 13 February	36 days earlier
Mendoza	227 km	9 September – 25 February	38 days earlier

Where to buy tomato plants and seeds near Rancagua

Buy plants ready to set out from 17 October to 20 February (from 26 September to 20 February for an unheated greenhouse); seed for raising your own is sown from 5 August to 30 December. Within 15 km of Rancagua OpenStreetMap lists 8 garden centres, 2 farm-supply shops, 1 plant nursery, 2 markets and 1 farm shop (collected 27 October 2026).

Vivero Karü — garden centre
Mon–Fri 08:00–18:00; Sat, Sun 09:00–18:00; public holidays closed · 11 km · viverohappygreen.cl
Jardín Rosal de Las Mercedes — garden centre
Manuel Cavieres 21 · 11 km · jardinrosaldelasmercedes.cl
Jardín Las Palmeras — garden centre
Pablo Rubio 299 · 15 km
Ce Ele! — market
Avenida Einstein 859 · Mon–Sun 11:00–00:00 · 2 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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