When to plant watermelons in Puerto Montt: 29 December – 25 February

In Puerto Montt, watermelon: sow for seedlings from 10 November to 28 January; plant into a greenhouse from 8 December to 25 February; plant out into open ground from 29 December to 25 February.

Watermelon in Puerto Montt: soil, season and weather

In Puerto Montt the soil, not frost, sets the date: the last frost is over around 22 August, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 29 December, 129 days later.

Last spring frost	22 August
Top 7 cm of soil at 18 °C	29 December, 129 days after the last frost
Into an unheated greenhouse	8 December – 25 February; December outside: 9.9 °C at night, 16.8 °C by day; card 18–35 °C
First autumn frost	5 June, 159 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	26 February – 24 April
Days left for picking	100
Daylight	14:56 on 1 December, 15:09 on 29 December
Watering outdoors when fruiting (card)	every 5 days; the driest month, February, has 9 rainy days

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

Watermelon in Puerto Montt: 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 Puerto Montt during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, February, averages 18.7 °C. Months that stay below 18 °C even by day on average: March–June and December (9.7–16.8 °C). Nights average below 18 °C in every month of the season, from 4.6 °C to 11.5 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
December	16.8	9.9	96	13	15:09
January	18.2	10.9	76	11	14:50
February	18.7	11.5	60	9	13:42
March	16.6	9.9	117	12	12:25
April	14.1	8	172	15	11:00
May	11.8	6.4	197	18	9:50
June	9.7	4.6	254	20	9:11

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

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

City	Distance	Date	Difference
Osorno	101 km	29 December – 21 February	same day
Bariloche	141 km	from 3 January	5 days later
Valdivia	186 km	11 December – 4 March	18 days earlier
Temuco	305 km	9 December – 11 February	20 days earlier
Los Ángeles	448 km	23 November – 20 February	36 days earlier
Coyhaique	461 km	from 10 December	19 days earlier

Where to buy watermelon plants and seeds near Puerto Montt

Buy plants ready to set out from 29 December to 25 February (from 8 December to 25 February for an unheated greenhouse); seed for raising your own is sown from 10 November to 28 January. Within 15 km of Puerto Montt OpenStreetMap lists 4 garden centres, 1 plant nursery and 11 markets (collected 20 October 2026).

Mercado Municipal Chile Barrio — market
3 km
Mercado Municipal Padre Hurtado — market
4 km
Feria Municipal Bosquemar — market
5 km
Feria Lagunitas — market
5 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