When to plant pumpkins in San Juan: 18 September – 23 February

In San Juan, pumpkin: sow for seedlings from 17 July to 12 January; plant into a greenhouse from 28 August to 23 February; plant out into open ground from 18 September to 23 February. For plants and seeds, the places nearby include Vivero Regalería Verde (garden centre, 2 km); addresses and opening hours are below.

Pumpkin in San Juan: soil, season and weather

In San Juan the soil, not frost, sets the date: the last frost is over around 27 July, but the top 7 cm of soil reaches 18 °C — the minimum on the pumpkin card — only around 18 September, 53 days later.

Last spring frost	27 July
Top 7 cm of soil at 18 °C	18 September, 53 days after the last frost
First autumn frost	19 June, 275 days after the start
Days in the bed to the first harvest (card)	75
First harvest, if planted in this window	2 December – 8 May
Days left for picking	200
Daylight	10:44 on 7 August, 11:58 on 18 September
Watering outdoors when fruiting (card)	every 5 days; the driest month, September, has 1 rainy day

The same dates in San Juan hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Watermelon.

Pumpkin in San Juan: care after planting

Planted on 18 September: in the first weeks water every 4 days.

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

9 October — feed: nitrogen

Pests and diseases of pumpkin 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 San Juan during the pumpkin season

About 117 mm of rain falls in the season; September is the driest month (4 mm) and January the wettest (27 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
September	23.7	9.3	4	1	11:52
October	27.4	13.1	15	2	12:50
November	31.7	17.8	5	1	13:43
December	34	20.3	14	3	14:11
January	34.2	21.8	27	5	13:59
February	33.3	20.9	15	3	13:12
March	30	17.8	17	3	12:19
April	24.7	13.1	9	2	11:20
May	19.1	8.3	7	2	10:32
June	15.4	4	4	1	10:06

ERA5 2016–2025, Open-Meteo

Pumpkin in nearby cities

Around San Juan, La Rioja is 19 days earlier and Valparaíso 41 days later.

City	Distance	Date	Difference
Mendoza	153 km	19 September – 20 February	1 day later
San Luis	284 km	25 September – 26 February	7 days later
La Rioja	286 km	30 August – 18 February	19 days earlier
Santiago	292 km	14 October – 21 February	26 days later
Valparaíso	335 km	from 29 October	41 days later
San Rafael	343 km	22 September – 8 February	4 days later

Where to buy pumpkin plants and seeds near San Juan

Buy plants ready to set out from 18 September to 23 February (from 28 August to 23 February for an unheated greenhouse); seed for raising your own is sown from 17 July to 12 January. Within 15 km of San Juan OpenStreetMap lists 9 garden centres, 5 farm-supply shops, 3 plant nurseries and 6 markets (collected 27 October 2026).

Don Julio — market
9 km
Super San Lorenzo — market
11 km
Bichucho — market
13 km
Vivero Regalería Verde — garden centre
Lateral de Circunvalación 899 (S), 5400 San Juan · 2 km · vivero-regaleria-verde.negocio.site

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.

Questions