When to plant watermelons in Graz: 8 June – 1 August

In Graz, watermelon: sow for seedlings from 20 April to 4 July; plant into a greenhouse from 18 May to 1 August; plant out into open ground from 8 June to 1 August.

Watermelon in Graz: soil, season and weather

In Graz the soil, not frost, sets the date: the last frost is over around 16 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 8 June, 53 days later.

Last spring frost	16 April
Top 7 cm of soil at 18 °C	8 June, 53 days after the last frost
Into an unheated greenhouse	18 May – 1 August; May outside: 9 °C at night, 19 °C by day; card 18–35 °C
First autumn frost	10 November, 155 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	6 August – 29 September
Days left for picking	96
Daylight	14:53 on 11 May, 15:47 on 8 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, October, has 8 rainy days

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

Watermelon in Graz: care after planting

Planted on 8 June: in the first weeks water every 5 days.

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

8 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 Graz during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 26.1 °C. Months that stay below 18 °C even by day on average: October (16.2 °C) and November (8.9 °C). Nights average below 18 °C in every month of the season, from 1.2 °C to 15.5 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	24.9	14.3	99	13	15:53
July	26.1	15.5	94	13	15:33
August	25.8	15.4	108	12	14:16
September	20.9	11.2	110	11	12:37
October	16.2	6.4	56	8	10:57
November	8.9	1.2	61	9	9:23

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Graz, Zagreb is 11 days earlier and Klagenfurt 25 days later.

City	Distance	Date	Difference
Klagenfurt	99 km	3 July – 27 July	25 days later
Vienna	145 km	8 June – 3 August	same day
Zagreb	146 km	28 May – 13 August	11 days earlier
Linz	163 km	4 June – 3 August	4 days earlier
Bratislava	173 km	31 May – 7 August	8 days earlier
Salzburg	198 km	9 June – 22 July	1 day later

Where to buy watermelon plants and seeds near Graz

Buy plants ready to set out from 8 June to 1 August (from 18 May to 1 August for an unheated greenhouse); seed for raising your own is sown from 20 April to 4 July. Within 15 km of Graz OpenStreetMap lists 24 garden centres, 5 plant nurseries, 30 markets and 47 farm shops (collected 28 October 2026).

Grazer Winterwelt — market
Jahngasse 1-3, 8010 Graz · Jan, Nov–Dec: Mon–Thu, Sun 09:00–19:00; Jan, Nov–Dec: Fri–Sat 09:00–22:00; Feb–Oct: closed · 1 km
Biobauernmarkt — market
Lazarettgürtel 55, 8020 Graz · Fri 10:00–16:00 · 2 km
Bauernmarkt Smart City — market
Waagner-Biro-Straße 98, 8020 Graz · Wed 15:00–19:00 · 2 km
Bauernmarkt Eggenberg-Hofbauerplatz (temporärer Platz) — market
Wed 06:00–13:00, Fri–Sat 06:00–13:00 · 3 km · eggenberg.at

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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