When to plant zucchini in Milwaukee: 28 May – 15 August

In Milwaukee, zucchini: sow for seedlings from 16 April to 25 July; plant into a greenhouse from 7 May to 15 August; plant out into open ground from 28 May to 15 August.

Zucchini in Milwaukee: soil, season and weather

In Milwaukee the soil, not frost, sets the date: the last frost is over around 27 April, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 28 May, 31 days later.

Last spring frost	27 April
Top 7 cm of soil at 18 °C	28 May, 31 days after the last frost
First autumn frost	1 November, 157 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	3 July – 20 September
Days left for picking	121
Daylight	14:20 on 7 May, 15:02 on 28 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 7 rainy days

The same dates in Milwaukee hold for Cucumber, Bell Pepper, Eggplant, Pumpkin and Watermelon.

Zucchini in Milwaukee: care after planting

Planted on 28 May: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Milwaukee during the zucchini season

About 639 mm of rain falls in the season; November is the driest month (50 mm) and June the wettest (116 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	18.7	8.8	113	13	14:38
June	25.4	15.2	116	12	15:21
July	27.6	18.3	90	10	15:04
August	26.7	17.8	81	10	13:59
September	23.4	14.9	91	10	12:33
October	16.2	8.3	98	10	11:06
November	8.2	0.9	50	7	9:45

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Milwaukee, Green Bay is 1 day earlier and Traverse City 8 days later.

City	Distance	Date	Difference
Madison	121 km	28 May – 10 August	same day
Rockford	128 km	28 May – 11 August	same day
Chicago	131 km	28 May – 20 August	same day
Green Bay	165 km	27 May – 13 August	1 day earlier
Grand Rapids	182 km	28 May – 17 August	same day
Traverse City	266 km	5 June – 23 August	8 days later

Where to buy zucchini plants and seeds near Milwaukee

Buy plants ready to set out from 28 May to 15 August (from 7 May to 15 August for an unheated greenhouse); seed for raising your own is sown from 16 April to 25 July. Within 15 km of Milwaukee OpenStreetMap lists 9 garden centres, 10 markets and 1 farm shop (collected 20 October 2026).

Stein's Garden & Home — garden centre
13 km
Fruit Of The Bloom Garden Center — garden centre
13 km
Milwaukee Winter Farmers Market — market
8 km
Alsum Sweet Corn — farm shop
14 km · alsumsweetcorn.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.

Questions