GreenlyWhen to plant watermelons in Tarragona: from 30 April
In Tarragona, watermelon: sow for seedlings from 12 March; plant into a greenhouse from 9 April; plant out into open ground from 30 April. There is no autumn frost here, so the frost dates set no end to the window. For plants and seeds, the places nearby include Infavet (farm supply, 13 km); addresses and opening hours are below.
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Watermelon in Tarragona: soil, season and weather
In Tarragona the soil, not frost, sets the date: the last frost is over around 12 January, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 30 April, 108 days later. Tarragona has no autumn frost in the median year, so frost does not end the season.
| Last spring frost | 12 January |
|---|---|
| Top 7 cm of soil at 18 °C | 30 April, 108 days after the last frost |
| Into an unheated greenhouse | from 9 April; April outside: 10.9 °C at night, 19.2 °C by day; card 18–35 °C |
| Days in the bed to the first harvest (card) | 59 |
| First harvest, if planted in this window | from 28 June |
| Daylight | 12:43 on 2 April, 13:55 on 30 April |
| Watering outdoors when fruiting (card) | every 5 days; the driest month, July, has 4 rainy days |
The same dates in Tarragona hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.
Watermelon in Tarragona: care after planting
Planted on 30 April: in the first weeks water every 5 days.
Feeding, by the card’s schedule from that day:
- 30 April — 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 Tarragona during the watermelon season
No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 30.3 °C. Nights average below 18 °C in April (10.9 °C) and May (14.4 °C).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days | Daylight on the 15th |
|---|---|---|---|---|---|
| April | 19.2 | 10.9 | 50 | 8 | 13:17 |
| May | 22.9 | 14.4 | 37 | 6 | 14:28 |
| June | 26.9 | 19.1 | 30 | 5 | 15:07 |
| July | 29.8 | 21.9 | 25 | 4 | 14:52 |
| August | 30.3 | 22.3 | 38 | 5 | 13:51 |
| September | 26.8 | 19.1 | 67 | 10 | 12:31 |
ERA5 2016–2025, Open-Meteo
Watermelon in nearby cities
Around Tarragona, Castellón de la Plana is 16 days earlier and Girona 26 days later.
Where to buy watermelon plants and seeds near Tarragona
Buy plants ready to set out from 30 April (from 9 April for an unheated greenhouse); seed for raising your own is sown from 12 March. Within 15 km of Tarragona OpenStreetMap lists 5 garden centres, 5 farm-supply shops, 10 markets and 1 farm shop (collected 27 October 2026).
- Infavet — farm supply
Carrer de Campoamor 4, Reus · 13 km - Mercat Central — market
Carrer de Sant Joan, 43201 · Mon–Thu 08:00–14:00; Fri 07:30–14:30, 17:30–20:30; Sat 07:30–15:00 · 13 km · mercatdereus.cat - Mercat Central — market
Plaça Corsini · Mon–Sat 08:30–21:00 · 1 km · mercatsdetarragona.cat - Mercat a l'aire lliure — market
Carrer de l'Arquitecte Ubach, 43840 Salou · Mon 09:00–14:00 · 11 km · mercadillos.org
Places: © OpenStreetMap contributors, ODbL.
- How to grow watermelon
- All frost dates and weather of Tarragona
- Shops and markets: Tarragona
- Selling a surplus in Spain
- Moon planting calendar for November 2026
- How we calculate the dates
Questions
When to plant watermelons in Tarragona?
In Tarragona, watermelon: sow for seedlings from 12 March; plant into a greenhouse from 9 April; plant out into open ground from 30 April. There is no autumn frost here, so the frost dates set no end to the window.
When to sow watermelons for seedlings in Tarragona?
Sow for seedlings from 12 March.
