GreenlyWhen to plant watermelons in Posadas: from 25 July
In Posadas, watermelon: sow for seedlings from 6 June; plant into a greenhouse from 4 July; plant out into open ground from 25 July. There is no autumn frost here, so the frost dates set no end to the window. For plants and seeds, the places nearby include Vivero los Arandanos (garden centre, 1 km); addresses and opening hours are below.
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Watermelon in Posadas: soil, season and weather
In Posadas frost, not soil, sets the date: the top 7 cm of soil warms to 18 °C — the minimum on the watermelon card — around 19 July, 1 day after the last frost on 18 July, so planting waits only for the week after that frost. Posadas has no autumn frost in the median year, so frost does not end the season.
| Last spring frost | 18 July |
|---|---|
| Top 7 cm of soil at 18 °C | 19 July, 1 day after the last frost |
| Into an unheated greenhouse | from 4 July; July outside: 11.8 °C at night, 21.2 °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 22 September |
| Daylight | 10:25 on 27 June, 10:42 on 25 July |
| Watering outdoors when fruiting (card) | every 5 days; the driest month, July, has 6 rainy days |
The same dates in Posadas hold for Tomato, Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.
Watermelon in Posadas: care after planting
Planted on 25 July: in the first weeks water every 5 days.
Feeding, by the card’s schedule from that day:
- 25 July — 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 Posadas during the watermelon season
No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, December, averages 30.7 °C. Nights average below 18 °C in July–October (11.8–17 °C).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days | Daylight on the 15th |
|---|---|---|---|---|---|
| July | 21.2 | 11.8 | 80 | 6 | 10:34 |
| August | 22.8 | 12.7 | 91 | 7 | 11:08 |
| September | 25.2 | 15.1 | 138 | 9 | 11:54 |
| October | 26.6 | 17 | 224 | 13 | 12:43 |
| November | 28.8 | 18.5 | 193 | 11 | 13:28 |
| December | 30.7 | 20.6 | 134 | 11 | 13:51 |
ERA5 2016–2025, Open-Meteo
Watermelon in nearby cities
1 of the nearest cities share Posadas's date.
| City | Distance | Date | Difference |
|---|---|---|---|
| Santa Maria | 328 km | 14 August – 3 March | 20 days later |
| Chapecó | 328 km | 12 September – 14 March | 49 days later |
| Passo Fundo | 358 km | 8 September – 8 March | 45 days later |
| Cascavel | 365 km | 25 July – 19 March | same day |
| Rivera | 392 km | 28 September – 29 February | 65 days later |
| Tacuarembó | 480 km | 14 October – 4 March | 81 days later |
Where to buy watermelon plants and seeds near Posadas
Buy plants ready to set out from 25 July (from 4 July for an unheated greenhouse); seed for raising your own is sown from 6 June. Within 15 km of Posadas OpenStreetMap lists 8 garden centres, 1 farm-supply shop, 3 plant nurseries and 24 markets (collected 27 October 2026).
- Centro de Interpretaciòn y VIvero — garden centre
3 km - orquidiario y vivero — garden centre
10 km - Parque El Puma — plant nursery
15 km - Vivero los Arandanos — garden centre
Avenida Santa Cruz, 3300 Posadas · 1 km
Places: © OpenStreetMap contributors, ODbL.
- How to grow watermelon
- All frost dates and weather of Posadas
- Shops and markets: Posadas
- Selling a surplus in Argentina
- Moon planting calendar for November 2026
- How we calculate the dates
Questions
When to plant watermelons in Posadas?
In Posadas, watermelon: sow for seedlings from 6 June; plant into a greenhouse from 4 July; plant out into open ground from 25 July. There is no autumn frost here, so the frost dates set no end to the window.
When to sow watermelons for seedlings in Posadas?
Sow for seedlings from 6 June.
