When to plant watermelons in Trelew: 22 October – 17 February

In Trelew, watermelon: sow for seedlings from 3 September to 20 January; plant into a greenhouse from 1 October to 17 February; plant out into open ground from 22 October to 17 February.

Watermelon in Trelew: soil, season and weather

In Trelew the soil, not frost, sets the date: the last frost is over around 29 August, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 22 October, 54 days later.

Last spring frost	29 August
Top 7 cm of soil at 18 °C	22 October, 54 days after the last frost
Into an unheated greenhouse	1 October – 17 February; October outside: 9.2 °C at night, 21.3 °C by day; card 18–35 °C
First autumn frost	28 May, 219 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	20 December – 16 April
Days left for picking	160
Daylight	12:12 on 24 September, 13:33 on 22 October
Watering outdoors when fruiting (card)	every 5 days; the driest month, February, has 2 rainy days

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

Watermelon in Trelew: care after planting

Planted on 22 October: in the first weeks water every 5 days.

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

22 October — 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 Trelew during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, January, averages 29.3 °C. Months that stay below 18 °C even by day on average: May (15.4 °C). Nights average below 18 °C in every month of the season, from 5.7 °C to 16 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
October	21.3	9.2	14	4	13:13
November	25	12.2	26	5	14:36
December	27.6	14.3	19	4	15:22
January	29.3	16	15	3	15:02
February	28.2	15.4	11	2	13:48
March	25.2	13.2	24	4	12:26
April	20.3	9.7	26	4	10:56
May	15.4	5.7	14	3	9:41

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Trelew, Neuquén is 5 days earlier and Bariloche 73 days later.

City	Distance	Date	Difference
Comodoro Rivadavia	338 km	1 November – 12 February	10 days later
Neuquén	531 km	17 October – 28 February	5 days earlier
Bariloche	546 km	from 3 January	73 days later
Bahía Blanca	565 km	5 November – 5 March	14 days later
Coyhaique	595 km	from 10 December	49 days later
Puerto Montt	657 km	29 December – 25 February	68 days later

Where to buy watermelon plants and seeds near Trelew

Buy plants ready to set out from 22 October to 17 February (from 1 October to 17 February for an unheated greenhouse); seed for raising your own is sown from 3 September to 20 January. Within 15 km of Trelew OpenStreetMap lists 1 plant nursery and 4 markets (collected 28 October 2026).

Mercado y Fiambrería Noelia — market
1 km
Área de Fitorremediación — plant nursery
7 km
Kiosco Mercado "Elliot" — market
1 km
Mercado Amiel — market
1 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