When to plant watermelons in Reynosa: 29 January – 13 September

In Reynosa, watermelon: sow for seedlings from 11 December to 16 August; plant into a greenhouse from 8 January to 13 September; plant out into open ground from 29 January to 13 September.

Watermelon in Reynosa: soil, season and weather

In Reynosa frost, not soil, sets the date: the top 7 cm of soil warms to 18 °C — the minimum on the watermelon card — around 8 January, 14 days before the last frost on 22 January, so planting waits only for the week after that frost.

Last spring frost	22 January
Top 7 cm of soil at 18 °C	8 January, 14 days before the last frost
Into an unheated greenhouse	8 January – 13 September; January outside: 12.1 °C at night, 22.5 °C by day; card 18–35 °C
First autumn frost	23 December, 328 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	29 March – 11 November
Days left for picking	269
Daylight	10:32 on 1 January, 10:55 on 29 January
Watering outdoors when fruiting (card)	every 5 days; the driest month, December, has 5 rainy days

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

Watermelon in Reynosa: care after planting

Planted on 29 January: in the first weeks water every 5 days.

Feeding, by the card’s schedule from that day:

29 January — 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 Reynosa during the watermelon season

Days average above the watermelon card's 18–35 °C in July (35.5 °C) and August (36.4 °C). Nights average below 18 °C in November–March (12.1–17.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
January	22.5	12.1	34	7	10:41
February	25.5	14.1	28	5	11:17
March	28.8	17.8	56	6	11:59
April	31	20.4	59	7	12:46
May	33.4	23.5	74	10	13:25
June	34.9	25.1	81	9	13:46
July	35.5	25.7	72	7	13:38
August	36.4	26.1	34	7	13:04
September	33.8	24.5	97	12	12:20
October	31.2	20.8	60	8	11:34
November	26.8	17	52	7	10:53
December	24.4	14.3	25	5	10:31

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

All the nearest cities on our list plant watermelon later than Reynosa; the closest date is in Nuevo Laredo, 5 days later.

City	Distance	Date	Difference
Nuevo Laredo	198 km	3 February – 13 September	5 days later
Corpus Christi	203 km	5 February – 13 September	7 days later
Monterrey	209 km	4 February – 13 September	6 days later
Saltillo	280 km	27 February – 17 August	29 days later
San Antonio	371 km	28 February – 26 August	30 days later
Austin	468 km	3 March – 3 September	33 days later

Where to buy watermelon plants and seeds near Reynosa

Buy plants ready to set out from 29 January to 13 September (from 8 January to 13 September for an unheated greenhouse); seed for raising your own is sown from 11 December to 16 August. Within 15 km of Reynosa OpenStreetMap lists 6 markets (collected 28 October 2026).

Mercado Zaragoza — market
0 km
Mercado Solidaridad — market
5 km
Tianguis de los muros — market
7 km
Tianguis de Jarachina — market
8 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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