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When to plant tomatoes in Aosta

In Aosta, tomato: sow for seedlings from 22 April; plant into a greenhouse from 13 June; plant out into open ground from 4 July. The frost-free season here is shorter than the 70 days the crop needs from planting to harvest (by its card): grow it in a greenhouse or choose an early variety. For plants and seeds, the places nearby include Agricenter (garden centre, 3 km); addresses and opening hours are below.

Tomato 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 15 °C — the minimum on the tomato card — only around 4 July, 28 days later. Between planting out (4 July) and the first autumn frost (10 September) there are 68 days, 2 fewer than the card's 70 to the first harvest; in an unheated greenhouse, three weeks earlier, 19 would be left to spare.

Last spring frost6 June
Top 7 cm of soil at 15 °C4 July, 28 days after the last frost
Into an unheated greenhousefrom 13 June; June outside: 5.5 °C at night, 15.9 °C by day; card 16–27 °C
First autumn frost10 September, 68 days after the start
Days in the bed to the first harvest (card)70
Days left for picking-2
Daylight14:50 on 13 May, 15:37 on 4 July
Watering outdoors when fruiting (card)every 3 days; the driest month, July, has 9 rainy days

Tomato in Aosta: care after planting

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

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

  • 4 July — feed: balanced (NPK)
  • 1 August — feed: nitrogen

Pests and diseases of tomato 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 tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 18.8 °C. Months that stay below 16 °C even by day on average: September (14 °C). Nights average below 16 °C in every month of the season, from 3.8 °C to 7.6 °C.

MonthDay, °CNight, °CRain, mmRainy daysDaylight on the 15th
July18.87.658915:23
August18.77.3711014:10
September143.8731112:35

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

All the nearest cities on our list plant tomato earlier than Aosta; the closest date is in Sion, 13 days earlier.

CityDistanceDateDifference
Sion55 km21 June – 29 June13 days earlier
Turin80 km16 April – 31 July79 days earlier
Annecy94 km2 June – 25 July32 days earlier
Lausanne102 km2 June – 31 July32 days earlier
Geneva105 km28 May – 28 July37 days earlier
Novara106 km18 April – 2 August77 days earlier

Where to buy tomato plants and seeds near Aosta

Buy plants ready to set out from 4 July (from 13 June for an unheated greenhouse); seed for raising your own is sown from 22 April. 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

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant tomatoes in Aosta?

In Aosta, tomato: sow for seedlings from 22 April; plant into a greenhouse from 13 June; plant out into open ground from 4 July. The frost-free season here is shorter than the 70 days the crop needs from planting to harvest (by its card): grow it in a greenhouse or choose an early variety.

When to sow tomatoes for seedlings in Aosta?

Sow for seedlings from 22 April.

When is the last spring frost in Aosta?

Last spring frost around 6 June, first autumn frost around 10 September.

Other crops in Aosta, with their dates