When to plant watermelons in Linz: 4 June – 3 August

In Linz, watermelon: sow for seedlings from 16 April to 6 July; plant into a greenhouse from 14 May to 3 August; plant out into open ground from 4 June to 3 August. For plants and seeds, the places nearby include Altenberger Direktvermarkter: Grinninger Karin (farm shop, 7 km) and Altenberger Direktvermarkter: Hartl Elisabeth, Abbrandtnergut (farm shop, 7 km); addresses and opening hours are below.

Watermelon in Linz: soil, season and weather

In Linz the soil, not frost, sets the date: the last frost is over around 7 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 4 June, 58 days later.

Last spring frost	7 April
Top 7 cm of soil at 18 °C	4 June, 58 days after the last frost
Into an unheated greenhouse	14 May – 3 August; May outside: 9.4 °C at night, 19.3 °C by day; card 18–35 °C
First autumn frost	12 November, 161 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	2 August – 1 October
Days left for picking	102
Daylight	14:49 on 7 May, 15:53 on 4 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, October, has 10 rainy days

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

Watermelon in Linz: care after planting

Planted on 4 June: in the first weeks water every 5 days.

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

4 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 Linz during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 26.2 °C. Months that stay below 18 °C even by day on average: October (15.6 °C) and November (8.3 °C). Nights average below 18 °C in every month of the season, from 2 °C to 15.7 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	25.4	14.6	84	12	16:04
July	26.2	15.7	88	13	15:43
August	26	15.7	95	12	14:22
September	21.1	11.8	82	10	12:38
October	15.6	7.3	54	10	10:54
November	8.3	2	59	10	9:16

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

All the nearest cities on our list plant watermelon later than Linz; the closest date is in Vienna, 4 days later.

City	Distance	Date	Difference
České Budějovice	75 km	18 June – 28 July	14 days later
Salzburg	109 km	9 June – 22 July	5 days later
Vienna	154 km	8 June – 3 August	4 days later
Graz	163 km	8 June – 1 August	4 days later
Plzeň	173 km	18 June – 27 July	14 days later
Regensburg	179 km	14 June – 29 July	10 days later

Where to buy watermelon plants and seeds near Linz

Buy plants ready to set out from 4 June to 3 August (from 14 May to 3 August for an unheated greenhouse); seed for raising your own is sown from 16 April to 6 July. Within 15 km of Linz OpenStreetMap lists 11 garden centres, 3 farm-supply shops, 1 plant nursery, 12 markets and 43 farm shops (collected 28 October 2026).

Altenberger Direktvermarkter: Grinninger Karin — farm shop
Panwinklerweg 1, 4203 Altenberg bei Linz · Mon–Sun 00:00–24:00 · 7 km · altenberg.at
Altenberger Direktvermarkter: Hartl Elisabeth, Abbrandtnergut — farm shop
Haslach 9, 4203 Altenberg bei Linz · no · 7 km · altenberg.at
Altenberger Direktvermarkter: Höglinger Andreas und Evelyn — farm shop
Haslach 9, 4203 Altenberg bei Linz · Mon, Wed, Fri 08:00–17:00 · 7 km · altenberg.at
Passauerhof — farm shop
Lohnharting 4, 4073 Lohnharting · Tue 08:00–12:30, 13:30–19:00; Thu–Sat 08:00–12:30, 13:30–19:00 · 8 km · passauerhof-hofladen.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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