When to plant tomatoes in Bern: 3 June – 14 July

In Bern, tomato: sow for seedlings from 22 March to 23 May; plant into a greenhouse from 13 May to 14 July; plant out into open ground from 3 June to 14 July. For plants and seeds, the places nearby include Wyss GartenLaden (garden centre, 1 km) and Wyss Gartencenter (garden centre, 3 km); addresses and opening hours are below.

Tomato in Bern: soil, season and weather

In Bern the soil, not frost, sets the date: the last frost is over around 24 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 3 June, 40 days later.

Last spring frost	24 April
Top 7 cm of soil at 15 °C	3 June, 40 days after the last frost
Into an unheated greenhouse	13 May – 14 July; May outside: 6.5 °C at night, 16.4 °C by day; card 16–27 °C
First autumn frost	3 November, 153 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	12 August – 22 September
Days left for picking	83
Daylight	13:24 on 12 April, 15:40 on 3 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 12 rainy days

Tomato in Bern: care after planting

Planted on 3 June: in the first weeks water every 4 days.

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

3 June — feed: balanced (NPK)
1 July — 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 Bern during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 23.7 °C. Months that stay below 16 °C even by day on average: October (13.9 °C) and November (6.9 °C). Nights average below 16 °C in every month of the season, from -0.3 °C to 12.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	22.1	11.4	120	15	15:52
July	23.7	12.9	120	15	15:32
August	23.7	12.6	99	12	14:16
September	19	8.9	94	12	12:37
October	13.9	4.8	99	12	10:57
November	6.9	-0.3	101	13	9:24

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Bern, Neuchâtel is 20 days earlier and Sion 18 days later.

City	Distance	Date	Difference
Fribourg	28 km	5 June – 17 July	2 days later
Neuchâtel	40 km	14 May – 8 August	20 days earlier
Lucerne	66 km	15 June – 30 June	12 days later
Basel	69 km	14 May – 31 July	20 days earlier
Lausanne	79 km	2 June – 31 July	1 day earlier
Sion	80 km	21 June – 29 June	18 days later

Where to buy tomato plants and seeds near Bern

Buy plants ready to set out from 3 June to 14 July (from 13 May to 14 July for an unheated greenhouse); seed for raising your own is sown from 22 March to 23 May. Within 15 km of Bern OpenStreetMap lists 8 garden centres, 2 plant nurseries, 8 markets and 53 farm shops (collected 27 October 2026).

Gärtnerei Schneider — garden centre
Rossgrabenstrasse 6, 3089 Hinterfultigen · 14 km · gaertnereischneider.ch
Gärtnerei Leonotis — garden centre
Mon–Fri 08:00–12:00, 13:30–18:00; Sat 08:00–16:00 · 14 km · leonotis.ch
Wyss GartenLaden — garden centre
Mon–Fri 09:00–12:30, 13:30–18:30; Sat 08:00–17:00 · 1 km · wyssgarten.ch
Wyss Gartencenter — garden centre
Untere Zollgasse 81, 3072 Ostermundigen · 3 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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