When to plant zucchini in Blenheim: 11 December – 13 March

In Blenheim, zucchini: sow for seedlings from 30 October to 21 February; plant into a greenhouse from 20 November to 13 March; plant out into open ground from 11 December to 13 March. For plants and seeds, the places nearby include Golden Mile Produce (farm shop, 6 km); addresses and opening hours are below.

Zucchini in Blenheim: soil, season and weather

In Blenheim the soil, not frost, sets the date: the last frost is over around 10 August, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 11 December, 123 days later.

Last spring frost	10 August
Top 7 cm of soil at 18 °C	11 December, 123 days after the last frost
First autumn frost	30 May, 171 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	16 January – 18 April
Days left for picking	135
Daylight	14:37 on 20 November, 15:07 on 11 December
Watering outdoors when fruiting (card)	every 3 days; the driest month, January, has 7 rainy days

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

Zucchini in Blenheim: care after planting

Planted on 11 December: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Blenheim during the zucchini season

About 401 mm of rain falls in the season; January is the driest month (50 mm) and December the wettest (78 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
December	21.8	12.9	78	10	15:09
January	23.3	14	50	7	14:51
February	23	13.8	65	6	13:42
March	21.1	12.3	61	8	12:25
April	18.3	10.2	75	7	11:00
May	15.7	8.2	72	9	9:50

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Blenheim, Napier is 38 days earlier and Nelson 9 days later.

City	Distance	Date	Difference
Nelson	63 km	20 December – 3 April	9 days later
Wellington	73 km	from 17 December	6 days later
Palmerston North	189 km	4 December – 3 April	7 days earlier
Christchurch	249 km	1 December – 18 March	10 days earlier
Napier	336 km	from 3 November	38 days earlier
Timaru	389 km	19 December – 17 March	8 days later

Where to buy zucchini plants and seeds near Blenheim

Buy plants ready to set out from 11 December to 13 March (from 20 November to 13 March for an unheated greenhouse); seed for raising your own is sown from 30 October to 21 February. Within 15 km of Blenheim OpenStreetMap lists 1 market and 1 farm shop (collected 28 October 2026).

Marlborough Farmers' Market — market
Maxwell Road · Sun 09:00–12:00 · 2 km
Golden Mile Produce — farm shop
Sat 14:00–18:00 · 6 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.

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