When to plant watermelons in Chillán: 14 November – 2 March

In Chillán, watermelon: sow for seedlings from 26 September to 3 February; plant into a greenhouse from 24 October to 2 March; plant out into open ground from 14 November to 2 March.

Watermelon in Chillán: soil, season and weather

In Chillán the soil, not frost, sets the date: the last frost is over around 30 August, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 14 November, 76 days later.

Last spring frost	30 August
Top 7 cm of soil at 18 °C	14 November, 76 days after the last frost
Into an unheated greenhouse	24 October – 2 March; October outside: 7.3 °C at night, 19.3 °C by day; card 18–35 °C
First autumn frost	11 June, 210 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	12 January – 30 April
Days left for picking	151
Daylight	13:03 on 17 October, 14:02 on 14 November
Watering outdoors when fruiting (card)	every 5 days; the driest month, February, has 1 rainy day

The same dates in Chillán hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Chillán: care after planting

Planted on 14 November: in the first weeks water every 5 days.

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

14 November — feed: balanced (NPK)

Pests and diseases of watermelon 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 Chillán during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, January, averages 29.7 °C. Months that stay below 18 °C even by day on average: May (15.2 °C) and June (12.8 °C). Nights average below 18 °C in every month of the season, from 5.2 °C to 13.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
November	23.6	9.9	37	4	14:04
December	27.6	12	12	3	14:38
January	29.7	13.7	14	2	14:23
February	29.6	13.9	7	1	13:26
March	26	11.6	23	2	12:22
April	20.2	9	78	7	11:10
May	15.2	6.5	134	10	10:12
June	12.8	5.2	234	13	9:40

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Chillán, Curicó is 14 days earlier and Temuco 25 days later.

City	Distance	Date	Difference
Concepción	88 km	6 December – 3 March	22 days later
Los Ángeles	98 km	23 November – 20 February	9 days later
Talca	138 km	6 November – 3 March	8 days earlier
Curicó	196 km	31 October – 26 February	14 days earlier
Temuco	241 km	9 December – 11 February	25 days later
Rancagua	298 km	6 November – 2 March	8 days earlier

Where to buy watermelon plants and seeds near Chillán

Buy plants ready to set out from 14 November to 2 March (from 24 October to 2 March for an unheated greenhouse); seed for raising your own is sown from 26 September to 3 February. Within 15 km of Chillán OpenStreetMap lists 4 markets (collected 27 October 2026).

Mercado Persa San Rafael — market
Avenida Los Puelches 1697, Chillán · 2 km
Mercado Municipal de Chillán — market
0 km
Mercado de Chillán — market
0 km
Persa Cordillera — market
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.

Questions