When to plant watermelons in Osorno: 29 December – 21 February

In Osorno, watermelon: sow for seedlings from 10 November to 24 January; plant into a greenhouse from 8 December to 21 February; plant out into open ground from 29 December to 21 February.

Watermelon in Osorno: soil, season and weather

In Osorno the soil, not frost, sets the date: the last frost is over around 15 September, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 29 December, 105 days later.

Last spring frost	15 September
Top 7 cm of soil at 18 °C	29 December, 105 days after the last frost
Into an unheated greenhouse	8 December – 21 February; December outside: 9.3 °C at night, 20 °C by day; card 18–35 °C
First autumn frost	1 June, 155 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	26 February – 20 April
Days left for picking	96
Daylight	14:50 on 1 December, 15:03 on 29 December
Watering outdoors when fruiting (card)	every 5 days; the driest month, January, has 5 rainy days

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

Watermelon in Osorno: care after planting

Planted on 29 December: in the first weeks water every 5 days.

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

29 December — 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 Osorno during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, February, averages 23.1 °C. Months that stay below 18 °C even by day on average: April (15.9 °C), May (12.9 °C) and June (10.6 °C). Nights average below 18 °C in every month of the season, from 3.8 °C to 11.2 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
December	20	9.3	54	7	15:03
January	22.4	10.5	30	5	14:45
February	23.1	11.2	31	5	13:39
March	19.7	9.3	75	8	12:24
April	15.9	7.4	110	12	11:02
May	12.9	5.5	139	14	9:54
June	10.6	3.8	203	17	9:17

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Osorno, Los Ángeles is 36 days earlier and Bariloche 5 days later.

City	Distance	Date	Difference
Valdivia	85 km	11 December – 4 March	18 days earlier
Puerto Montt	101 km	29 December – 25 February	same day
Bariloche	166 km	from 3 January	5 days later
Temuco	208 km	9 December – 11 February	20 days earlier
Los Ángeles	351 km	23 November – 20 February	36 days earlier
Concepción	416 km	6 December – 3 March	23 days earlier

Where to buy watermelon plants and seeds near Osorno

Buy plants ready to set out from 29 December to 21 February (from 8 December to 21 February for an unheated greenhouse); seed for raising your own is sown from 10 November to 24 January. Within 15 km of Osorno OpenStreetMap lists 1 plant nursery and 3 markets (collected 27 October 2026).

Huerto Comunitario "Amore" — plant nursery
3 km
Mercado Municipal de Rahue — market
2 km
Mercado Municipal — market
0 km
Feria Libre Pedro Aguirre Cerda — 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