When to plant watermelons in Fort Wayne: 21 May – 24 July

In Fort Wayne, watermelon: sow for seedlings from 2 April to 26 June; plant into a greenhouse from 30 April to 24 July; plant out into open ground from 21 May to 24 July.

Watermelon in Fort Wayne: soil, season and weather

In Fort Wayne the soil, not frost, sets the date: the last frost is over around 24 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 21 May, 27 days later.

Last spring frost	24 April
Top 7 cm of soil at 18 °C	21 May, 27 days after the last frost
Into an unheated greenhouse	30 April – 24 July; April outside: 4.5 °C at night, 15.7 °C by day; card 18–35 °C
First autumn frost	2 November, 165 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	19 July – 21 September
Days left for picking	106
Daylight	13:38 on 23 April, 14:39 on 21 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, November, has 9 rainy days

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

Watermelon in Fort Wayne: care after planting

Planted on 21 May: in the first weeks water every 5 days.

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

21 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 Fort Wayne during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 28.6 °C. Months that stay below 18 °C even by day on average: November (10.1 °C). Nights average below 18 °C in May, June and August–November (1.8–17.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	21.7	11.1	108	13	14:28
June	27.2	16.9	95	12	15:07
July	28.6	18.9	97	13	14:52
August	27.6	17.8	75	11	13:51
September	25.1	15	64	8	12:31
October	18.2	8.9	80	11	11:10
November	10.1	1.8	62	9	9:55

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Fort Wayne, Dayton is 5 days earlier and Ann Arbor 8 days later.

City	Distance	Date	Difference
Toledo (United States)	148 km	24 May – 29 July	3 days later
Dayton	167 km	16 May – 31 July	5 days earlier
Indianapolis	169 km	16 May – 28 July	5 days earlier
Ann Arbor	176 km	29 May – 27 July	8 days later
Lansing	187 km	28 May – 24 July	7 days later
Grand Rapids	214 km	28 May – 25 July	7 days later

Where to buy watermelon plants and seeds near Fort Wayne

Buy plants ready to set out from 21 May to 24 July (from 30 April to 24 July for an unheated greenhouse); seed for raising your own is sown from 2 April to 26 June. Within 15 km of Fort Wayne OpenStreetMap lists 2 garden centres, 1 farm-supply shop, 2 markets and 2 farm shops (collected 28 October 2026).

YLNI Farmers Market — market
Pearl Street 350, 46802 Fort Wayne · 0 km
greenhouses and florists — garden centre
5 km
Cook's Orchard Store — farm shop
10 km
Schmucker's Produce And Greenhouse — farm shop
15 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