When to plant watermelons in Brest (France): 20 June – 3 September

In Brest (France), watermelon: sow for seedlings from 2 May to 6 August; plant into a greenhouse from 30 May to 3 September; plant out into open ground from 20 June to 3 September. For plants and seeds, the places nearby include Ferme de Traon Bihan (farm shop, 4 km) and La ferme de Vourc'h Vras (farm shop, 12 km); addresses and opening hours are below.

Watermelon in Brest (France): soil, season and weather

In Brest (France) the soil, not frost, sets the date: the last frost is over around 21 February, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 20 June, 119 days later.

Last spring frost	21 February
Top 7 cm of soil at 18 °C	20 June, 119 days after the last frost
Into an unheated greenhouse	30 May – 3 September; May outside: 9.4 °C at night, 16.8 °C by day; card 18–35 °C
First autumn frost	13 December, 176 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	18 August – 1 November
Days left for picking	117
Daylight	15:31 on 23 May, 16:06 on 20 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, July, has 13 rainy days

The same dates in Brest (France) hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Brest (France): care after planting

Planted on 20 June: in the first weeks water every 5 days.

Feeding, by the card’s schedule from that day:

20 June — feed: balanced (NPK)

Pests and diseases of watermelon to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in Brest (France) during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 20.9 °C. Months that stay below 18 °C even by day on average: October (15.9 °C), November (12.6 °C) and December (10.7 °C). Nights average below 18 °C in every month of the season, from 6.5 °C to 14 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	19.3	12.2	94	14	16:05
July	20.9	13.9	65	13	15:44
August	20.8	14	71	12	14:23
September	18.9	12.6	84	14	12:39
October	15.9	10.5	116	15	10:54
November	12.6	8.1	130	17	9:15
December	10.7	6.5	143	18	8:21

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Brest (France), Nantes is 23 days earlier and Plymouth 27 days later.

City	Distance	Date	Difference
Quimper	52 km	15 June – 30 August	5 days earlier
Rennes	210 km	1 June – 19 August	19 days earlier
Plymouth	222 km	17 July – 22 August	27 days later
Nantes	255 km	28 May – 20 August	23 days earlier
Exeter	268 km	23 June – 18 August	3 days later
Angers	311 km	28 May – 18 August	23 days earlier

Where to buy watermelon plants and seeds near Brest (France)

Buy plants ready to set out from 20 June to 3 September (from 30 May to 3 September for an unheated greenhouse); seed for raising your own is sown from 2 May to 6 August. Within 15 km of Brest (France) OpenStreetMap lists 13 garden centres, 1 plant nursery, 22 markets and 15 farm shops (collected 27 October 2026).

Marché de Bourg-Blanc — market
Place de l'Étang, 29860 Bourg-Blanc · Sun 09:00–13:00 · 12 km
Les Brebis d'Iroise — farm shop
Ty Baol, 29217 Plougonvelin · Wed, Sat 14:30–18:30 · 14 km · facebook.com
La ferme de Vourc'h Vras — farm shop
Vourch Vras, 29860 Plabennec · 12 km · app.cagette.net
Ferme de Traon Bihan — farm shop
Fri 17:00–19:00 · 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.

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