When to plant watermelons in Fort Worth: 22 March – 21 August

In Fort Worth, watermelon: sow for seedlings from 1 February to 24 July; plant into a greenhouse from 1 March to 21 August; plant out into open ground from 22 March to 21 August. For plants and seeds, the places nearby include Calloway's Nursery (garden centre, 6 km) and Farmers Market Fort Worth (farm shop, 9 km); addresses and opening hours are below.

Watermelon in Fort Worth: soil, season and weather

In Fort Worth the soil, not frost, sets the date: the last frost is over around 19 February, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 22 March, 31 days later.

Last spring frost	19 February
Top 7 cm of soil at 18 °C	22 March, 31 days after the last frost
Into an unheated greenhouse	1 March – 21 August; March outside: 10.8 °C at night, 22.2 °C by day; card 18–35 °C
First autumn frost	30 November, 253 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	20 May – 19 October
Days left for picking	194
Daylight	11:14 on 22 February, 12:11 on 22 March
Watering outdoors when fruiting (card)	every 5 days; the driest month, July, has 7 rainy days

The same dates in Fort Worth hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Fort Worth: care after planting

Planted on 22 March: in the first weeks water every 5 days.

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

22 March — 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 Fort Worth during the watermelon season

Days average above the watermelon card's 18–35 °C in July (35.7 °C) and August (35.2 °C). Nights average below 18 °C in March, April and October, November (9.9–15.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
March	22.2	10.8	98	9	11:56
April	25.1	13.9	133	10	12:58
May	28.9	18.6	174	13	13:50
June	33.1	23	106	11	14:18
July	35.7	25.4	48	7	14:07
August	35.2	25.3	85	9	13:23
September	31.9	21.8	85	8	12:24
October	27	15.8	128	7	11:24
November	20.3	9.9	70	6	10:30

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Fort Worth, Houston is 26 days earlier and Oklahoma City 24 days later.

City	Distance	Date	Difference
Dallas	49 km	27 March – 26 August	5 days later
Lawton	231 km	4 April – 2 August	13 days later
Austin	276 km	3 March – 3 September	19 days earlier
Oklahoma City	305 km	15 April – 1 August	24 days later
Shreveport	332 km	20 March – 30 August	2 days earlier
Houston	379 km	24 February – 18 August	26 days earlier

Where to buy watermelon plants and seeds near Fort Worth

Buy plants ready to set out from 22 March to 21 August (from 1 March to 21 August for an unheated greenhouse); seed for raising your own is sown from 1 February to 24 July. Within 15 km of Fort Worth OpenStreetMap lists 4 garden centres, 3 farm-supply shops, 1 plant nursery and 1 farm shop (collected 20 October 2026).

Russell Feed & Supply — farm supply
Benbrook Boulevard 8704 · Mon–Fri 08:00–19:00; Sat 08:00–18:00; Sun 11:00–17:00 · 15 km
Farmers Market Fort Worth — farm shop
Belknap Street 5507, 76117 · Mon–Fri 08:00–17:30; Sat 08:00–17:00 · 9 km · farmersmarketftw.com
Walmart Garden Center — garden centre
4 km
Calloway's Nursery — garden centre
Mon–Sat 09:00–18:00; Sun 09:00–14:00 · 6 km · calloways.com

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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