When to plant zucchini in Colmar: 16 June – 31 August

In Colmar, zucchini: sow for seedlings from 5 May to 10 August; plant into a greenhouse from 26 May to 31 August; plant out into open ground from 16 June to 31 August.

Zucchini in Colmar: soil, season and weather

In Colmar the soil, not frost, sets the date: the last frost is over around 20 April, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 16 June, 57 days later.

Last spring frost	20 April
Top 7 cm of soil at 18 °C	16 June, 57 days after the last frost
First autumn frost	17 November, 154 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	22 July – 6 October
Days left for picking	118
Daylight	15:35 on 26 May, 16:02 on 16 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 12 rainy days

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

Zucchini in Colmar: care after planting

Planted on 16 June: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Colmar during the zucchini season

About 503 mm of rain falls in the season; September is the driest month (69 mm) and June the wettest (102 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	21.8	12.9	102	15	16:02
July	23.1	13.9	77	13	15:41
August	23.2	14.1	81	13	14:21
September	18.9	10.7	69	12	12:38
October	14.4	7.2	82	12	10:54
November	8	2.3	92	14	9:17

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

All the nearest cities on our list plant zucchini earlier than Colmar; the closest date is in Zurich, 5 days earlier.

City	Distance	Date	Difference
Mulhouse	37 km	1 June – 31 August	15 days earlier
Freiburg im Breisgau	38 km	4 June – 30 August	12 days earlier
Basel	60 km	5 June – 3 September	11 days earlier
Strasbourg	62 km	1 June – 3 September	15 days earlier
Nancy	110 km	3 June – 31 August	13 days earlier
Zurich	118 km	11 June – 30 August	5 days earlier

Where to buy zucchini plants and seeds near Colmar

Buy plants ready to set out from 16 June to 31 August (from 26 May to 31 August for an unheated greenhouse); seed for raising your own is sown from 5 May to 10 August. Within 15 km of Colmar OpenStreetMap lists 10 garden centres, 6 farm-supply shops, 1 plant nursery, 1 market and 8 farm shops (collected 27 October 2026).

Trèfle Vert — garden centre
13 km
Au jardin des 4 saisons — garden centre
15 km
Jardinerie des Erlen — garden centre
4 km
Alsa Plantes — plant nursery
4 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