GreenlyWhen to plant watermelons in Curitiba: from 3 September
In Curitiba, watermelon: sow for seedlings from 16 July; plant into a greenhouse from 13 August; plant out into open ground from 3 September. There is no autumn frost here, so the frost dates set no end to the window. For plants and seeds, the places nearby include Horto Municipal do Guabirotuba (plant nursery, 4 km) and Leroy Merlin (garden centre, 5 km); addresses and opening hours are below.
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Watermelon in Curitiba: soil, season and weather
In Curitiba the soil, not frost, sets the date: the last frost is over around 19 July, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 3 September, 46 days later. Curitiba has no autumn frost in the median year, so frost does not end the season.
| Last spring frost | 19 July |
|---|---|
| Top 7 cm of soil at 18 °C | 3 September, 46 days after the last frost |
| Into an unheated greenhouse | from 13 August; August outside: 10.3 °C at night, 20 °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 1 November |
| Daylight | 11:02 on 6 August, 11:38 on 3 September |
| Watering outdoors when fruiting (card) | every 5 days; the driest month, September, has 10 rainy days |
The same dates in Curitiba hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.
Watermelon in Curitiba: care after planting
Planted on 3 September: in the first weeks water every 5 days.
Feeding, by the card’s schedule from that day:
- 3 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 Curitiba during the watermelon season
No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, January, averages 25.5 °C. Nights average below 18 °C in every month of the season, from 12.7 °C to 17.8 °C.
| Month | Day, °C | Night, °C | Rain, mm | Rainy days | Daylight on the 15th |
|---|---|---|---|---|---|
| September | 22.6 | 12.7 | 105 | 10 | 11:55 |
| October | 22.4 | 14 | 172 | 18 | 12:40 |
| November | 23.4 | 14.7 | 121 | 17 | 13:21 |
| December | 25.4 | 16.8 | 162 | 21 | 13:43 |
| January | 25.5 | 17.8 | 203 | 24 | 13:33 |
ERA5 2016–2025, Open-Meteo
Watermelon in nearby cities
Around Curitiba, Cascavel is 40 days earlier and Lages 21 days later.
| City | Distance | Date | Difference |
|---|---|---|---|
| Ponta Grossa | 97 km | 4 September – 15 March | 1 day later |
| Guarapuava | 221 km | 22 September – 14 March | 19 days later |
| Lages | 286 km | 24 September – 14 March | 21 days later |
| Chapecó | 382 km | 12 September – 14 March | 9 days later |
| Cascavel | 425 km | 25 July – 19 March | 40 days earlier |
| Passo Fundo | 443 km | 8 September – 8 March | 5 days later |
Where to buy watermelon plants and seeds near Curitiba
Buy plants ready to set out from 3 September (from 13 August for an unheated greenhouse); seed for raising your own is sown from 16 July. Within 15 km of Curitiba OpenStreetMap lists 3 garden centres, 2 farm-supply shops, 1 plant nursery, 31 markets and 2 farm shops (collected 20 October 2026).
- Leroy Merlin — garden centre
Avenida Presidente Wenceslau Braz 88, 81030-030 · 5 km - Flora Quatro Elementos — garden centre
Rua Joaquim Nabuco 702, 83040-210 São José dos Pinhais · 12 km - Horto Municipal do Guabirotuba — plant nursery
Avenida Senador Salgado Filho 1050 · 4 km - Agrorural — farm supply
Rua Tenente Djalma Dutra 1339, 83005-360 São José dos Pinhais · 14 km
Places: © OpenStreetMap contributors, ODbL.
- How to grow watermelon
- All frost dates and weather of Curitiba
- Shops and markets: Curitiba
- Moon planting calendar for November 2026
- How we calculate the dates
Questions
When to plant watermelons in Curitiba?
In Curitiba, watermelon: sow for seedlings from 16 July; plant into a greenhouse from 13 August; plant out into open ground from 3 September. There is no autumn frost here, so the frost dates set no end to the window.
When to sow watermelons for seedlings in Curitiba?
Sow for seedlings from 16 July.
