When to plant zucchini in Southampton: 17 June – 6 September

In Southampton, zucchini: sow for seedlings from 6 May to 16 August; plant into a greenhouse from 27 May to 6 September; plant out into open ground from 17 June to 6 September. For plants and seeds, the places nearby include Sunnyfields (farm shop, 6 km) and Roebridge (farm shop, 12 km); addresses and opening hours are below.

Zucchini in Southampton: soil, season and weather

In Southampton the soil, not frost, sets the date: the last frost is over around 4 April, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 17 June, 74 days later.

Last spring frost	4 April
Top 7 cm of soil at 18 °C	17 June, 74 days after the last frost
First autumn frost	23 November, 159 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	23 July – 12 October
Days left for picking	123
Daylight	16:02 on 27 May, 16:31 on 17 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, July, has 10 rainy days

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

Zucchini in Southampton: care after planting

Planted on 17 June: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Southampton during the zucchini season

About 432 mm of rain falls in the season; July is the driest month (54 mm) and October the wettest (100 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	20.5	11.5	59	11	16:30
July	22.3	13.5	54	10	16:06
August	21.8	13.3	60	10	14:36
September	19.2	11.2	73	11	12:42
October	15.4	8.8	100	13	10:47
November	11.1	5.2	86	13	8:58

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Southampton, London is 5 days earlier and Brighton 33 days later.

City	Distance	Date	Difference
Portsmouth	24 km	16 June – 14 September	1 day earlier
Brighton	89 km	20 July – 14 September	33 days later
Oxford	95 km	23 June – 6 September	6 days later
Bristol	103 km	19 June – 5 September	2 days later
London	111 km	12 June – 6 September	5 days earlier
Cardiff	140 km	24 June – 5 September	7 days later

Where to buy zucchini plants and seeds near Southampton

Buy plants ready to set out from 17 June to 6 September (from 27 May to 6 September for an unheated greenhouse); seed for raising your own is sown from 6 May to 16 August. Within 15 km of Southampton OpenStreetMap lists 28 garden centres, 15 plant nurseries, 1 market and 10 farm shops (collected 20 October 2026).

Kingsland Market — market
Sat · 1 km
Westlands Farm Shop & Cafe — farm shop
Pricketts Hill, SO32 2JW Southampton · 15 km · westlandsfarmshop.co.uk
Roebridge — farm shop
The Hundred 16, Romsey · 12 km
Sunnyfields — farm shop
Jacob's Gutter Lane, SO40 9FX · 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.

Questions