When to plant zucchini in Portsmouth: 16 June – 14 September

In Portsmouth, zucchini: sow for seedlings from 5 May to 24 August; plant into a greenhouse from 26 May to 14 September; plant out into open ground from 16 June to 14 September. For plants and seeds, the places nearby include Tuppenny Barn (farm shop, 13 km) and Westlands Farm Shop & Cafe (farm shop, 13 km); addresses and opening hours are below.

Zucchini in Portsmouth: soil, season and weather

In Portsmouth the soil, not frost, sets the date: the last frost is over around 4 March, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 16 June, 104 days later.

Last spring frost	4 March
Top 7 cm of soil at 18 °C	16 June, 104 days after the last frost
First autumn frost	1 December, 168 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	22 July – 20 October
Days left for picking	132
Daylight	15:59 on 26 May, 16:29 on 16 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, June, has 11 rainy days

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

Zucchini in Portsmouth: 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 Portsmouth during the zucchini season

About 568 mm of rain falls in the season; June is the driest month (59 mm) and October the wettest (108 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	19	12.8	59	11	16:29
July	20.7	14.9	60	12	16:05
August	20.7	14.8	64	11	14:36
September	18.9	13	79	11	12:42
October	15.5	10.8	108	14	10:47
November	11.7	7.1	100	14	8:59
December	9.7	5.6	98	14	7:59

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Portsmouth, London is 4 days earlier and Brighton 34 days later.

City	Distance	Date	Difference
Southampton	24 km	17 June – 6 September	1 day later
Brighton	67 km	20 July – 14 September	34 days later
London	103 km	12 June – 6 September	4 days earlier
Oxford	105 km	23 June – 6 September	7 days later
Bristol	127 km	19 June – 5 September	3 days later
Cardiff	164 km	24 June – 5 September	8 days later

Where to buy zucchini plants and seeds near Portsmouth

Buy plants ready to set out from 16 June to 14 September (from 26 May to 14 September for an unheated greenhouse); seed for raising your own is sown from 5 May to 24 August. Within 15 km of Portsmouth OpenStreetMap lists 16 garden centres, 4 plant nurseries, 5 markets and 8 farm shops (collected 28 October 2026).

Westlands Farm Shop & Cafe — farm shop
Pricketts Hill, SO32 2JW Southampton · 13 km · westlandsfarmshop.co.uk
Southbourne Farm Shop — farm shop
Main Road, PO10 8JN Southbourne, Emsworth · 13 km · southbournefarmshop.co.uk
Tuppenny Barn — farm shop
Main Road, PO10 8EZ Southbourne · 13 km
Island Farm Eggs — farm shop
Carpenters Road, PO36 0BA Ryde · 14 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