When to plant watermelons in Aosta: 1 July – 13 July

In Aosta, watermelon: sow for seedlings from 13 May to 15 June; plant into a greenhouse from 10 June to 13 July; plant out into open ground from 1 July to 13 July. For plants and seeds, the places nearby include Agricenter (garden centre, 3 km); addresses and opening hours are below.

Watermelon in Aosta: soil, season and weather

In Aosta the soil, not frost, sets the date: the last frost is over around 6 June, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 1 July, 25 days later. Planting out on 1 July leaves 71 days to the first autumn frost on 10 September, only 12 more than the card's 59 days to the first harvest; an unheated greenhouse, three weeks earlier, would add 21.

Last spring frost	6 June
Top 7 cm of soil at 18 °C	1 July, 25 days after the last frost
Into an unheated greenhouse	10 June – 13 July; June outside: 5.5 °C at night, 15.9 °C by day; card 18–35 °C
First autumn frost	10 September, 71 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	29 August – 10 September
Days left for picking	12
Daylight	15:30 on 3 June, 15:40 on 1 July
Watering outdoors when fruiting (card)	every 5 days; the driest month, July, has 9 rainy days

The same dates in Aosta hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Aosta: care after planting

Planted on 1 July: in the first weeks water every 5 days.

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

1 July — 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 Aosta during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 18.8 °C. Months that stay below 18 °C even by day on average: September (14 °C). Nights average below 18 °C in every month of the season, from 3.8 °C to 7.6 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
July	18.8	7.6	58	9	15:23
August	18.7	7.3	71	10	14:10
September	14	3.8	73	11	12:35

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

All the nearest cities on our list plant watermelon earlier than Aosta; the closest date is in Sion, 3 days earlier.

City	Distance	Date	Difference
Sion	55 km	28 June – 10 July	3 days earlier
Turin	80 km	16 May – 11 August	46 days earlier
Annecy	94 km	19 June – 5 August	12 days earlier
Lausanne	102 km	19 June – 11 August	12 days earlier
Geneva	105 km	8 June – 8 August	23 days earlier
Novara	106 km	23 May – 13 August	39 days earlier

Where to buy watermelon plants and seeds near Aosta

Buy plants ready to set out from 1 July to 13 July (from 10 June to 13 July for an unheated greenhouse); seed for raising your own is sown from 13 May to 15 June. Within 15 km of Aosta OpenStreetMap lists 4 garden centres, 2 markets and 2 farm shops (collected 27 October 2026).

Agricenter — garden centre
Via / Rue de la Croix-Noire 79, 11020 Saint-Christophe · Mon–Sat 08:30–12:30; Mon–Fri 15:00–19:00 · 3 km
Mercato coperto / Halles d'Aoste — market
Piazza dei Cavalieri di Vittorio Veneto - Place des Chevaliers de Vittorio Veneto, 11100 Aosta / Aoste · Mon, Tue, Thu, Fri 07:30–14:00; Wed, Sat 07:00–15:00 · 1 km
Isa Vivai — garden centre
8 km · isavivai.com
Vivai Valdostani — garden centre
5 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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