When to plant watermelons in Birmingham (United States): 9 April – 17 August

In Birmingham (United States), watermelon: sow for seedlings from 19 February to 20 July; plant into a greenhouse from 19 March to 17 August; plant out into open ground from 9 April to 17 August. For plants and seeds, the places nearby include Leaf & Petal (garden centre, 4 km) and Walmart Garden Center (garden centre, 8 km); addresses and opening hours are below.

Watermelon in Birmingham (United States): soil, season and weather

In Birmingham (United States) the soil, not frost, sets the date: the last frost is over around 10 March, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 9 April, 30 days later.

Last spring frost	10 March
Top 7 cm of soil at 18 °C	9 April, 30 days after the last frost
Into an unheated greenhouse	19 March – 17 August; March outside: 8.9 °C at night, 19.3 °C by day; card 18–35 °C
First autumn frost	26 November, 231 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	7 June – 15 October
Days left for picking	172
Daylight	11:50 on 12 March, 12:48 on 9 April
Watering outdoors when fruiting (card)	every 5 days; the driest month, November, has 8 rainy days

The same dates in Birmingham (United States) hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Birmingham (United States): care after planting

Planted on 9 April: in the first weeks water every 5 days.

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

9 April — 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 Birmingham (United States) during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 32 °C. Nights average below 18 °C in April, May and October, November (8.1–16.6 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	22.7	11.6	125	10	13:00
May	27	16.6	108	12	13:53
June	30.4	20.5	121	14	14:22
July	32	22.6	116	17	14:10
August	31.5	22.1	119	15	13:25
September	29.8	19.8	87	8	12:25
October	24.6	14.2	89	7	11:23
November	18.3	8.1	77	8	10:27

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Birmingham (United States), Montgomery is 23 days earlier and Huntsville 25 days later.

City	Distance	Date	Difference
Huntsville	132 km	4 May – 5 August	25 days later
Montgomery	136 km	17 March – 20 August	23 days earlier
Chattanooga	224 km	27 April – 3 August	18 days later
Atlanta	225 km	13 April – 13 August	4 days later
Nashville	294 km	3 May – 5 August	24 days later
Macon	303 km	23 March – 22 August	17 days earlier

Where to buy watermelon plants and seeds near Birmingham (United States)

Buy plants ready to set out from 9 April to 17 August (from 19 March to 17 August for an unheated greenhouse); seed for raising your own is sown from 19 February to 20 July. Within 15 km of Birmingham (United States) OpenStreetMap lists 6 garden centres and 2 markets (collected 20 October 2026).

Leaf & Petal — garden centre
Lane Park Rd 2612, 35223 Mountain Brook · Mon–Sat 09:00–17:30; Sun 12:00–17:00 · 4 km · bbgardens.org
Walmart Garden Center — garden centre
Montclair Road 1600, 35210 Irondale · Mon–Sun 06:00–24:00 · 8 km · walmart.com
Walmart Garden Center — garden centre
Hackworth Road 2473, 35214 Birmingham · Mon–Sun 06:00–24:00 · 13 km · walmart.com
Leaf & Petal — garden centre
Crosshaven Drive 4113, Birmingham · 10 km · leafnpetal.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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