When to plant watermelons in Potosí: 28 November – 5 December

In Potosí, watermelon: sow for seedlings from 10 October to 7 November; plant into a greenhouse from 7 November to 5 December; plant out into open ground from 28 November to 5 December.

Watermelon in Potosí: soil, season and weather

In Potosí frost, not soil, sets the date: the top 7 cm of soil warms to 18 °C — the minimum on the watermelon card — around 14 October, 38 days before the last frost on 21 November, so planting waits only for the week after that frost. Planting out on 28 November leaves 66 days to the first autumn frost on 2 February, only 7 more than the card's 59 days to the first harvest; an unheated greenhouse, three weeks earlier, would add 21.

Last spring frost	21 November
Top 7 cm of soil at 18 °C	14 October, 38 days before the last frost
Into an unheated greenhouse	7 November – 5 December; November outside: 2.4 °C at night, 14.1 °C by day; card 18–35 °C
First autumn frost	2 February, 66 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	26 January – 2 February
Days left for picking	7
Daylight	12:48 on 31 October, 13:11 on 28 November
Watering outdoors when fruiting (card)	every 5 days; the driest month, November, has 17 rainy days

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

Watermelon in Potosí: care after planting

Planted on 28 November: in the first weeks water every 5 days.

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

28 November — 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 Potosí during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, November, averages 14.1 °C. Months that stay below 18 °C even by day on average: November–February (11.3–14.1 °C). Nights average below 18 °C in every month of the season, from 2.4 °C to 3.1 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
November	14.1	2.4	77	17	13:02
December	12.8	3	153	25	13:18
January	11.7	3.1	173	25	13:11
February	11.3	3.1	151	24	12:44

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

All the nearest cities on our list plant watermelon earlier than Potosí; the closest date is in La Paz, 27 days earlier.

City	Distance	Date	Difference
Sucre	80 km	21 August – 21 March	99 days earlier
Oruro	228 km	19 October – 19 January	40 days earlier
Tarija	241 km	11 September – 3 March	78 days earlier
Cochabamba	247 km	2 September – 12 March	87 days earlier
La Paz	426 km	1 November – 9 January	27 days earlier
Calama	460 km	from 9 September	80 days earlier

Where to buy watermelon plants and seeds near Potosí

Buy plants ready to set out from 28 November to 5 December (from 7 November to 5 December for an unheated greenhouse); seed for raising your own is sown from 10 October to 7 November. Within 15 km of Potosí OpenStreetMap lists 16 markets (collected 27 October 2026).

Mercado Villa Santiago — market
2 km
Mercado Calvario — market
2 km
Mercado Solidario — market
2 km
Mercado de Gremios — market
1 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.

Questions