When to plant watermelons in Tudela: 6 May – 28 August

In Tudela, watermelon: sow for seedlings from 18 March to 31 July; plant into a greenhouse from 15 April to 28 August; plant out into open ground from 6 May to 28 August. For plants and seeds, the places nearby include Frutas y Hortalizas Fontellas (farm shop, 6 km) and La Casa del Aceite (farm shop, 11 km); addresses and opening hours are below.

Watermelon in Tudela: soil, season and weather

In Tudela the soil, not frost, sets the date: the last frost is over around 6 March, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 6 May, 61 days later.

Last spring frost	6 March
Top 7 cm of soil at 18 °C	6 May, 61 days after the last frost
Into an unheated greenhouse	15 April – 28 August; April outside: 8.1 °C at night, 19.3 °C by day; card 18–35 °C
First autumn frost	7 December, 215 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	4 July – 26 October
Days left for picking	156
Daylight	13:01 on 8 April, 14:13 on 6 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, July, has 2 rainy days

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

Watermelon in Tudela: care after planting

Planted on 6 May: in the first weeks water every 5 days.

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

6 May — 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 Tudela during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 32.7 °C. Months that stay below 18 °C even by day on average: November (14.7 °C) and December (11.1 °C). Nights average below 18 °C in May, June and September–December (3.7–16.2 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	24	11.7	46	8	14:33
June	29.5	16.2	29	6	15:14
July	32.7	18.2	13	2	14:58
August	32.5	18.5	13	2	13:55
September	26.6	15	32	6	12:32
October	21.8	11.4	44	7	11:08
November	14.7	6.5	53	10	9:50
December	11.1	3.7	34	6	9:08

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Tudela, Zaragoza is 6 days earlier and Jaca 44 days later.

City	Distance	Date	Difference
Zaragoza	76 km	30 April – 10 September	6 days earlier
Soria	79 km	30 May – 31 July	24 days later
Logroño	82 km	28 May – 25 August	22 days later
Pamplona	82 km	1 June – 21 August	26 days later
Huesca	99 km	23 May – 17 August	17 days later
Jaca	102 km	19 June – 22 July	44 days later

Where to buy watermelon plants and seeds near Tudela

Buy plants ready to set out from 6 May to 28 August (from 15 April to 28 August for an unheated greenhouse); seed for raising your own is sown from 18 March to 31 July. Within 15 km of Tudela OpenStreetMap lists 2 farm-supply shops, 2 markets and 3 farm shops (collected 28 October 2026).

Frutas y Hortalizas Fontellas — farm shop
Avenida Navarra 70, Fontellas · 6 km
La Casa del Aceite — farm shop
Carretera Tudela - Tarazona, 31520 Cascante · 11 km · lacasadelaceite.com
Agrobardenas — farm supply
13 km
Placeta Abadía — market
15 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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