When to plant tomatoes in San Rafael: 11 September – 13 February

In San Rafael, tomato: sow for seedlings from 30 June to 23 December; plant into a greenhouse from 21 August to 13 February; plant out into open ground from 11 September to 13 February. For plants and seeds, the places nearby include Vivero Cedro Azul (garden centre, 2 km); addresses and opening hours are below.

Tomato in San Rafael: soil, season and weather

In San Rafael the soil, not frost, sets the date: the last frost is over around 23 August, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 11 September, 19 days later.

Last spring frost	23 August
Top 7 cm of soil at 15 °C	11 September, 19 days after the last frost
Into an unheated greenhouse	21 August – 13 February; August outside: 4.1 °C at night, 17.9 °C by day; card 16–27 °C
First autumn frost	4 June, 267 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	20 November – 23 April
Days left for picking	197
Daylight	10:09 on 21 July, 11:42 on 11 September
Watering outdoors when fruiting (card)	every 3 days; the driest month, June, has 2 rainy days

Tomato in San Rafael: care after planting

Planted on 11 September: in the first weeks water every 4 days.

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

11 September — feed: balanced (NPK)
9 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 San Rafael during the tomato season

Days average above the tomato card's 16–27 °C in November–February (28.3–31.6 °C). Months that stay below 16 °C even by day on average: June (14.4 °C). Nights average below 16 °C in March–June and September–November (2.8–14.9 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
September	21.4	7.4	12	2	11:51
October	24.2	10.3	47	5	12:55
November	28.3	14.5	32	5	13:55
December	31	17.3	26	5	14:27
January	31.6	19	52	8	14:13
February	30.4	18	44	7	13:21
March	26.9	14.9	35	5	12:20
April	22	10.7	29	4	11:14
May	17.1	6.6	32	5	10:20
June	14.4	2.8	9	2	9:51

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around San Rafael, San Luis is 11 days earlier and Rancagua 36 days later.

City	Distance	Date	Difference
Mendoza	198 km	9 September – 25 February	2 days earlier
Rancagua	226 km	17 October – 20 February	36 days later
San Luis	238 km	31 August – 2 March	11 days earlier
Santiago	251 km	23 September – 26 February	12 days later
Curicó	268 km	15 October – 15 February	34 days later
Talca	314 km	15 October – 21 February	34 days later

Where to buy tomato plants and seeds near San Rafael

Buy plants ready to set out from 11 September to 13 February (from 21 August to 13 February for an unheated greenhouse); seed for raising your own is sown from 30 June to 23 December. Within 15 km of San Rafael OpenStreetMap lists 1 garden centre, 1 market and 1 farm shop (collected 28 October 2026).

Vivero Cedro Azul — garden centre
Marcelino Champagnat 435, 5600 · 2 km
La Lili — market
Lassa, 5600 · Tue–Sun 09:00–21:00 · 7 km
Finca Rubio — farm shop
11 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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