GreenlyWhen to plant tomatoes in Mar del Plata: from 18 October
In Mar del Plata, tomato: sow for seedlings from 6 August; plant into a greenhouse from 27 September; plant out into open ground from 18 October. There is no autumn frost here, so the frost dates set no end to the window. For plants and seeds, the places nearby include Floreria Y Regaleria Llantén (garden centre, 3 km) and San Remo (garden centre, 3 km); addresses and opening hours are below.
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Tomato in Mar del Plata: soil, season and weather
In Mar del Plata the soil, not frost, sets the date: the last frost is over around 15 July, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 18 October, 95 days later. Mar del Plata has no autumn frost in the median year, so frost does not end the season.
| Last spring frost | 15 July |
|---|---|
| Top 7 cm of soil at 15 °C | 18 October, 95 days after the last frost |
| Into an unheated greenhouse | from 27 September; September outside: 7.9 °C at night, 15.4 °C by day; card 16–27 °C |
| Days in the bed to the first harvest (card) | 70 |
| First harvest, if planted in this window | from 27 December |
| Daylight | 11:04 on 27 August, 13:09 on 18 October |
| Watering outdoors when fruiting (card) | every 3 days; the driest month, January, has 8 rainy days |
Tomato in Mar del Plata: care after planting
Planted on 18 October: in the first weeks water every 4 days.
Feeding, by the card’s schedule from that day:
- 18 October — feed: balanced (NPK)
- 15 November — feed: nitrogen
Pests and diseases of tomato to watch for:
- Bacterial canker of tomato
- Tomato leaf mould
- Late Blight
- Bacterial spot
- Fruit cracking
- Bacterial wilt (brown rot of potato)
Dates count from the first planting day of the window above; a later planting moves them by as many days.
Weather in Mar del Plata during the tomato season
No month of the season averages above the tomato card's 16–27 °C by day; the warmest, January, averages 25.7 °C. Nights average below 16 °C in March and October–December (9.9–15.6 °C).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days | Daylight on the 15th |
|---|---|---|---|---|---|
| October | 17.9 | 9.9 | 67 | 9 | 13:02 |
| November | 20.9 | 12.6 | 79 | 9 | 14:10 |
| December | 23.8 | 15 | 91 | 9 | 14:47 |
| January | 25.7 | 17.1 | 66 | 8 | 14:31 |
| February | 24.9 | 17.3 | 92 | 10 | 13:30 |
| March | 22.7 | 15.6 | 79 | 10 | 12:22 |
ERA5 2016–2025, Open-Meteo
Tomato in nearby cities
All the nearest cities on our list plant tomato earlier than Mar del Plata; the closest date is in Bahía Blanca, 25 days earlier.
| City | Distance | Date | Difference |
|---|---|---|---|
| La Plata | 344 km | 19 September – 25 February | 29 days earlier |
| Buenos Aires | 385 km | from 2 September | 46 days earlier |
| Colonia del Sacramento | 393 km | from 19 August | 60 days earlier |
| Maldonado | 416 km | from 10 September | 38 days earlier |
| Bahía Blanca | 418 km | 23 September – 23 February | 25 days earlier |
| Santa Rosa | 615 km | 22 September – 21 February | 26 days earlier |
Where to buy tomato plants and seeds near Mar del Plata
Buy plants ready to set out from 18 October (from 27 September for an unheated greenhouse); seed for raising your own is sown from 6 August. Within 15 km of Mar del Plata OpenStreetMap lists 6 garden centres, 1 farm-supply shop, 17 markets and 2 farm shops (collected 27 October 2026).
- Floreria Y Regaleria Llantén — garden centre
Avenida Pedro Luro 6563 · 3 km - San Remo — garden centre
Avenida Pedro Luro 6612 · 3 km - Paseo de Compras Alto Luro — market
Avenida Pedro Luro 6925 · 08:00–12:30, 17:00–21:30 · 4 km - FERIA LURO — market
Avenida Pedro Luro 5959 · 3 km
Places: © OpenStreetMap contributors, ODbL.
- How to grow tomato
- All frost dates and weather of Mar del Plata
- Shops and markets: Mar del Plata
- Selling a surplus in Argentina
- When to plant tomatoes in Argentina
- Moon planting calendar for November 2026
- How we calculate the dates
Questions
When to plant tomatoes in Mar del Plata?
In Mar del Plata, tomato: sow for seedlings from 6 August; plant into a greenhouse from 27 September; plant out into open ground from 18 October. There is no autumn frost here, so the frost dates set no end to the window.
When to sow tomatoes for seedlings in Mar del Plata?
Sow for seedlings from 6 August.
