GreenlyWhen to plant watermelons in Paraná: from 10 September
In Paraná, watermelon: sow for seedlings from 23 July; plant into a greenhouse from 20 August; plant out into open ground from 10 September. There is no autumn frost here, so the frost dates set no end to the window.
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Watermelon in Paraná: soil, season and weather
In Paraná the soil, not frost, sets the date: the last frost is over around 8 July, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 10 September, 64 days later. Paraná has no autumn frost in the median year, so frost does not end the season.
| Last spring frost | 8 July |
|---|---|
| Top 7 cm of soil at 18 °C | 10 September, 64 days after the last frost |
| Into an unheated greenhouse | from 20 August; August outside: 9.7 °C at night, 19.3 °C by day; card 18–35 °C |
| Days in the bed to the first harvest (card) | 59 |
| First harvest, if planted in this window | from 8 November |
| Daylight | 10:53 on 13 August, 11:43 on 10 September |
| Watering outdoors when fruiting (card) | every 5 days; the driest month, September, has 5 rainy days |
The same dates in Paraná hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.
Watermelon in Paraná: care after planting
Planted on 10 September: in the first weeks water every 5 days.
Feeding, by the card’s schedule from that day:
- 10 September — 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 Paraná during the watermelon season
No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, January, averages 30.9 °C. Nights average below 18 °C in September (11.8 °C), October (14.4 °C) and November (17.4 °C).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days | Daylight on the 15th |
|---|---|---|---|---|---|
| September | 22.1 | 11.8 | 44 | 5 | 11:52 |
| October | 24.8 | 14.4 | 84 | 8 | 12:50 |
| November | 27.8 | 17.4 | 89 | 7 | 13:44 |
| December | 29.8 | 19.7 | 98 | 8 | 14:12 |
| January | 30.9 | 21.6 | 118 | 8 | 14:00 |
| February | 29.9 | 20.8 | 107 | 7 | 13:13 |
ERA5 2016–2025, Open-Meteo
Watermelon in nearby cities
Around Paraná, Salto is 19 days earlier and Buenos Aires 27 days later.
Where to buy watermelon plants and seeds near Paraná
Buy plants ready to set out from 10 September (from 20 August for an unheated greenhouse); seed for raising your own is sown from 23 July. Within 15 km of Paraná OpenStreetMap lists 1 garden centre and 5 markets (collected 27 October 2026).
- Supermercado Amanecer — market
Avenida Zanni 2614, 3100 Paraná · 6 km - Mercado Nogoyá — market
Nogoyá, 3100 Paraná · 1 km - Día — market
Benicio López, 3100 Paraná · 6 km - Mercado Concentrador El Charrua — market
Almafuerte, 3100 Paraná · 6 km
Places: © OpenStreetMap contributors, ODbL.
- How to grow watermelon
- All frost dates and weather of Paraná
- Shops and markets: Paraná
- Selling a surplus in Argentina
- Moon planting calendar for November 2026
- How we calculate the dates
Questions
When to plant watermelons in Paraná?
In Paraná, watermelon: sow for seedlings from 23 July; plant into a greenhouse from 20 August; plant out into open ground from 10 September. There is no autumn frost here, so the frost dates set no end to the window.
When to sow watermelons for seedlings in Paraná?
Sow for seedlings from 23 July.
