When to plant watermelons in Frankfort: 13 May – 25 July

In Frankfort, watermelon: sow for seedlings from 25 March to 27 June; plant into a greenhouse from 22 April to 25 July; plant out into open ground from 13 May to 25 July. For plants and seeds, the places nearby include Buckmeadow Farms (farm shop, 14 km); addresses and opening hours are below.

Watermelon in Frankfort: soil, season and weather

In Frankfort the soil, not frost, sets the date: the last frost is over around 12 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 13 May, 31 days later.

Last spring frost	12 April
Top 7 cm of soil at 18 °C	13 May, 31 days after the last frost
Into an unheated greenhouse	22 April – 25 July; April outside: 7.5 °C at night, 18.9 °C by day; card 18–35 °C
First autumn frost	3 November, 174 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	11 July – 22 September
Days left for picking	115
Daylight	13:10 on 15 April, 14:10 on 13 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, September, has 8 rainy days

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

Watermelon in Frankfort: care after planting

Planted on 13 May: in the first weeks water every 5 days.

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

13 May — 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 Frankfort during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 30.3 °C. Months that stay below 18 °C even by day on average: November (13.2 °C). Nights average below 18 °C in May, June and September–November (3.5–17.6 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	23.8	13.2	122	15	14:14
June	28.6	17.6	111	13	14:48
July	30.3	20.1	129	14	14:35
August	29.4	19	89	12	13:40
September	27.2	16.2	81	8	12:28
October	20.9	10.3	88	9	11:15
November	13.2	3.5	85	9	10:08

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Frankfort, Bowling Green is 9 days earlier and Dayton 3 days later.

City	Distance	Date	Difference
Lexington	41 km	15 May – 29 July	2 days later
Louisville	78 km	7 May – 2 August	6 days earlier
Cincinnati	108 km	13 May – 31 July	same day
Dayton	183 km	16 May – 31 July	3 days later
Bowling Green	194 km	4 May – 1 August	9 days earlier
Indianapolis	207 km	16 May – 28 July	3 days later

Where to buy watermelon plants and seeds near Frankfort

Buy plants ready to set out from 13 May to 25 July (from 22 April to 25 July for an unheated greenhouse); seed for raising your own is sown from 25 March to 27 June. Within 15 km of Frankfort OpenStreetMap lists 1 plant nursery, 2 markets and 1 farm shop (collected 28 October 2026).

Franklin County Farmers Market Shelter — market
Holmes Street 203, 40601 Frankfort · Apr–Nov Sat 08:30–12:00; May–Sept Tue 08:30–12:00 · 0 km · franklincountyfarmersmarket.org
Old Farmer's Market shelter — market
West Broadway Street 512, 40601 Frankfort · 1 km
Buckmeadow Farms — farm shop
Ninevah Road 1323, 40342 · Sat 10:00–19:00; Sun 00:00–17:00 · 14 km · buckmeadowfarms.com
Wilson Nursery — plant nursery
2 km · wilsonnurseriesky.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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