GreenlyWhen to plant watermelons in Colonia del Sacramento: from 15 October
In Colonia del Sacramento, watermelon: sow for seedlings from 27 August; plant into a greenhouse from 24 September; plant out into open ground from 15 October. There is no autumn frost here, so the frost dates set no end to the window.
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Watermelon in Colonia del Sacramento: soil, season and weather
In Colonia del Sacramento the soil, not frost, sets the date: the last frost is over around 9 July, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 15 October, 98 days later. Colonia del Sacramento has no autumn frost in the median year, so frost does not end the season.
| Last spring frost | 9 July |
|---|---|
| Top 7 cm of soil at 18 °C | 15 October, 98 days after the last frost |
| Into an unheated greenhouse | from 24 September; September outside: 10.8 °C at night, 18.6 °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 13 December |
| Daylight | 11:55 on 17 September, 12:55 on 15 October |
| Watering outdoors when fruiting (card) | every 5 days; the driest month, January, has 10 rainy days |
The same dates in Colonia del Sacramento hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.
Watermelon in Colonia del Sacramento: care after planting
Planted on 15 October: in the first weeks water every 5 days.
Feeding, by the card’s schedule from that day:
- 15 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 Colonia del Sacramento during the watermelon season
No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, January, averages 28.9 °C. Nights average below 18 °C in October (13.2 °C) and November (16.2 °C).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days | Daylight on the 15th |
|---|---|---|---|---|---|
| October | 21.3 | 13.2 | 96 | 10 | 12:55 |
| November | 25 | 16.2 | 86 | 8 | 13:55 |
| December | 27.5 | 18.5 | 81 | 8 | 14:26 |
| January | 28.9 | 20.5 | 80 | 10 | 14:12 |
| February | 28.1 | 20.1 | 84 | 8 | 13:20 |
| March | 25.6 | 18.1 | 142 | 10 | 12:20 |
ERA5 2016–2025, Open-Meteo
Watermelon in nearby cities
Around Colonia del Sacramento, Salto is 54 days earlier and Maldonado 9 days later.
| City | Distance | Date | Difference |
|---|---|---|---|
| La Plata | 51 km | 20 October – 7 March | 5 days later |
| Buenos Aires | 52 km | from 7 October | 8 days earlier |
| Paysandú | 240 km | 21 September – 17 March | 24 days earlier |
| Maldonado | 269 km | from 24 October | 9 days later |
| Rosario | 309 km | 29 September – 5 March | 16 days earlier |
| Salto | 344 km | from 22 August | 54 days earlier |
Where to buy watermelon plants and seeds near Colonia del Sacramento
Buy plants ready to set out from 15 October (from 24 September for an unheated greenhouse); seed for raising your own is sown from 27 August. Within 15 km of Colonia del Sacramento OpenStreetMap lists 1 garden centre and 1 farm-supply shop (collected 28 October 2026).
- Vivero — garden centre
4 km - Agro Jardín Colonia — farm supply
0 km
Places: © OpenStreetMap contributors, ODbL.
- How to grow watermelon
- All frost dates and weather of Colonia del Sacramento
- Shops and markets: Colonia del Sacramento
- Selling a surplus in Uruguay
- Moon planting calendar for November 2026
- How we calculate the dates
Questions
When to plant watermelons in Colonia del Sacramento?
In Colonia del Sacramento, watermelon: sow for seedlings from 27 August; plant into a greenhouse from 24 September; plant out into open ground from 15 October. There is no autumn frost here, so the frost dates set no end to the window.
When to sow watermelons for seedlings in Colonia del Sacramento?
Sow for seedlings from 27 August.
