When to plant watermelons in Corpus Christi: 5 February – 13 September

In Corpus Christi, watermelon: sow for seedlings from 18 December to 16 August; plant into a greenhouse from 15 January to 13 September; plant out into open ground from 5 February to 13 September.

Watermelon in Corpus Christi: soil, season and weather

In Corpus Christi the soil, not frost, sets the date: the last frost is over around 27 January, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 5 February, 9 days later.

Last spring frost	27 January
Top 7 cm of soil at 18 °C	5 February, 9 days after the last frost
Into an unheated greenhouse	15 January – 13 September; January outside: 10.8 °C at night, 19.7 °C by day; card 18–35 °C
First autumn frost	23 December, 321 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	5 April – 11 November
Days left for picking	262
Daylight	10:29 on 8 January, 10:58 on 5 February
Watering outdoors when fruiting (card)	every 5 days; the driest month, February, has 7 rainy days

The same dates in Corpus Christi hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Corpus Christi: care after planting

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

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

5 February — 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 Corpus Christi during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 33.2 °C. Nights average below 18 °C in February, March and November, December (12.7–16.9 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
February	22.1	12.7	39	7	11:13
March	25.1	16.9	81	9	11:58
April	27.3	19.4	73	10	12:49
May	29.9	23.1	98	13	13:31
June	31.8	25.2	110	13	13:53
July	32.8	25.8	90	10	13:44
August	33.2	26	86	11	13:09
September	31.4	24.4	111	15	12:21
October	28.8	20.6	66	10	11:32
November	24.4	16.2	72	9	10:47
December	21.7	13	54	7	10:24

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Corpus Christi, Reynosa is 7 days earlier and Austin 26 days later.

City	Distance	Date	Difference
Reynosa	203 km	29 January – 13 September	7 days earlier
Nuevo Laredo	212 km	3 February – 13 September	2 days earlier
San Antonio	215 km	28 February – 26 August	23 days later
Austin	283 km	3 March – 3 September	26 days later
Houston	299 km	24 February – 18 August	19 days later
Monterrey	369 km	4 February – 13 September	1 day earlier

Where to buy watermelon plants and seeds near Corpus Christi

Buy plants ready to set out from 5 February to 13 September (from 15 January to 13 September for an unheated greenhouse); seed for raising your own is sown from 18 December to 16 August. Within 15 km of Corpus Christi OpenStreetMap lists 1 garden centre and 1 market (collected 29 October 2026).

BotaniCo — garden centre
4 km
Moody's Quality Meats — market
4 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.

Questions