When to plant zucchini in Ann Arbor: 29 May – 19 August

In Ann Arbor, zucchini: sow for seedlings from 17 April to 29 July; plant into a greenhouse from 8 May to 19 August; plant out into open ground from 29 May to 19 August.

Zucchini in Ann Arbor: soil, season and weather

In Ann Arbor the soil, not frost, sets the date: the last frost is over around 28 April, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 29 May, 31 days later.

Last spring frost	28 April
Top 7 cm of soil at 18 °C	29 May, 31 days after the last frost
First autumn frost	5 November, 160 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	4 July – 24 September
Days left for picking	124
Daylight	14:19 on 8 May, 14:59 on 29 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 10 rainy days

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

Zucchini in Ann Arbor: care after planting

Planted on 29 May: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Ann Arbor during the zucchini season

About 569 mm of rain falls in the season; November is the driest month (56 mm) and July the wettest (92 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	20.6	9.7	88	13	14:34
June	26.3	15.5	87	12	15:15
July	28.1	18	92	13	14:59
August	26.9	17.1	87	11	13:56
September	23.7	14.1	73	9	12:32
October	16.7	8	86	12	11:07
November	8.7	0.9	56	10	9:49

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

All the nearest cities on our list plant zucchini earlier than Ann Arbor; the closest date is in Lansing, 1 day earlier.

City	Distance	Date	Difference
Detroit	58 km	27 May – 21 August	2 days earlier
Windsor	60 km	27 May – 21 August	2 days earlier
Toledo (United States)	72 km	24 May – 21 August	5 days earlier
Lansing	82 km	28 May – 16 August	1 day earlier
Grand Rapids	174 km	28 May – 17 August	1 day earlier
Fort Wayne	176 km	21 May – 16 August	8 days earlier

Where to buy zucchini plants and seeds near Ann Arbor

Buy plants ready to set out from 29 May to 19 August (from 8 May to 19 August for an unheated greenhouse); seed for raising your own is sown from 17 April to 29 July. Within 15 km of Ann Arbor OpenStreetMap lists 4 garden centres, 1 farm-supply shop, 2 plant nurseries, 10 markets and 5 farm shops (collected 28 October 2026).

Market @ Mark Jefferson Science Complex — market
11 km
Market @ Eastern Eateries — market
11 km
Market @ Pray-Harrold — market
11 km
Annie G's Dairy — farm shop · sells: milk
11 km · facebook.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