When to plant watermelons in Cascavel: 25 July – 19 March

In Cascavel, watermelon: sow for seedlings from 6 June to 20 February; plant into a greenhouse from 4 July to 19 March; plant out into open ground from 25 July to 19 March. For plants and seeds, the places nearby include Agropecuária Galina (farm supply, 3 km); addresses and opening hours are below.

Watermelon in Cascavel: soil, season and weather

In Cascavel frost, not soil, sets the date: the top 7 cm of soil warms to 18 °C — the minimum on the watermelon card — around 24 July, 6 days after the last frost on 18 July, so planting waits only for the week after that frost.

Last spring frost	18 July
Top 7 cm of soil at 18 °C	24 July, 6 days after the last frost
Into an unheated greenhouse	4 July – 19 March; July outside: 12 °C at night, 21.1 °C by day; card 18–35 °C
First autumn frost	28 June, 339 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	22 September – 17 May
Days left for picking	280
Daylight	10:35 on 27 June, 10:51 on 25 July
Watering outdoors when fruiting (card)	every 5 days; the driest month, July, has 6 rainy days

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

Watermelon in Cascavel: 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 Cascavel during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, December, averages 27.6 °C. Nights average below 18 °C in April–November (12–17.5 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
July	21.1	12	64	6	10:43
August	22.8	13	101	7	11:14
September	26.1	15.9	109	9	11:56
October	26.3	16.9	211	15	12:39
November	27.1	17.5	115	12	13:19
December	27.6	19.1	174	17	13:40
January	27.6	19.8	170	20	13:31
February	27.6	19.5	135	16	12:56
March	27.3	18.8	118	16	12:16
April	25.2	16.5	82	10	11:31
May	21.9	13.9	143	10	10:55
June	20.3	12.5	114	10	10:36

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

1 of the nearest cities share Cascavel's date.

City	Distance	Date	Difference
Guarapuava	206 km	22 September – 14 March	59 days later
Chapecó	252 km	12 September – 14 March	49 days later
Ponta Grossa	333 km	4 September – 15 March	41 days later
Posadas	365 km	from 25 July	same day
Passo Fundo	381 km	8 September – 8 March	45 days later
Curitiba	425 km	from 3 September	40 days later

Where to buy watermelon plants and seeds near Cascavel

Buy plants ready to set out from 25 July to 19 March (from 4 July to 19 March for an unheated greenhouse); seed for raising your own is sown from 6 June to 20 February. Within 15 km of Cascavel OpenStreetMap lists 1 farm-supply shop and 2 markets (collected 27 October 2026).

Agropecuária Galina — farm supply
Rua Rio da Paz · 3 km
Mercado Mônaco — market
Rua Jacarandá 534, 85807-660 Cascavel · 4 km
Show Rural Coopavel — market
BR 277 KM 577, 85818-560 Cascavel · 12 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.

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