When to plant watermelons in Green Bay: 27 May – 21 July

In Green Bay, watermelon: sow for seedlings from 8 April to 23 June; plant into a greenhouse from 6 May to 21 July; plant out into open ground from 27 May to 21 July.

Watermelon in Green Bay: soil, season and weather

In Green Bay the soil, not frost, sets the date: the last frost is over around 29 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 27 May, 28 days later.

Last spring frost	29 April
Top 7 cm of soil at 18 °C	27 May, 28 days after the last frost
Into an unheated greenhouse	6 May – 21 July; May outside: 8.9 °C at night, 19.8 °C by day; card 18–35 °C
First autumn frost	30 October, 156 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	25 July – 18 September
Days left for picking	97
Daylight	14:07 on 29 April, 15:11 on 27 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, September, has 9 rainy days

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

Watermelon in Green Bay: care after planting

Planted on 27 May: in the first weeks water every 5 days.

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

27 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 Green Bay 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 °C. Months that stay below 18 °C even by day on average: October (15.4 °C). Nights average below 18 °C in every month of the season, from 7 °C to 17.8 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19.8	8.9	91	11	14:47
June	26.1	15.3	96	12	15:32
July	28	17.8	103	11	15:14
August	26.6	17	91	11	14:05
September	23	13.8	67	9	12:34
October	15.4	7	83	11	11:03

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

All the nearest cities on our list plant watermelon later than Green Bay; the closest date is in Milwaukee, 1 day later.

City	Distance	Date	Difference
Milwaukee	165 km	28 May – 23 July	1 day later
Traverse City	192 km	5 June – 31 July	9 days later
Madison	196 km	28 May – 18 July	1 day later
Grand Rapids	256 km	28 May – 25 July	1 day later
Rockford	265 km	28 May – 19 July	1 day later
Chicago	295 km	28 May – 28 July	1 day later

Where to buy watermelon plants and seeds near Green Bay

Buy plants ready to set out from 27 May to 21 July (from 6 May to 21 July for an unheated greenhouse); seed for raising your own is sown from 8 April to 23 June. Within 15 km of Green Bay OpenStreetMap lists 6 garden centres, 1 plant nursery and 2 markets (collected 20 October 2026).

Stein's Garden & Home — garden centre
8 km
Walmart Garden Center — garden centre
12 km
Pamperin Park Flower Garden — plant nursery
7 km
Oneida Farmers Market — market
Water Circle Place N7332, 54155 Oneida · Jun Thu[3]–Sept 30 Thu 12:00–18:00 · 14 km · oneida-nsn.gov

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