When to plant watermelons in Zacatecas: 21 February – 17 August

In Zacatecas, watermelon: sow for seedlings from 3 January to 20 July; plant into a greenhouse from 31 January to 17 August; plant out into open ground from 21 February to 17 August.

Watermelon in Zacatecas: soil, season and weather

In Zacatecas the soil, not frost, sets the date: the last frost is over around 29 January, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 21 February, 23 days later.

Last spring frost	29 January
Top 7 cm of soil at 18 °C	21 February, 23 days after the last frost
Into an unheated greenhouse	31 January – 17 August; January outside: 5.7 °C at night, 19.2 °C by day; card 18–35 °C
First autumn frost	26 November, 278 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	21 April – 15 October
Days left for picking	219
Daylight	11:00 on 24 January, 11:31 on 21 February
Watering outdoors when fruiting (card)	every 5 days; the driest month, March, has 1 rainy day

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

Watermelon in Zacatecas: care after planting

Planted on 21 February: in the first weeks water every 5 days.

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

21 February — 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 Zacatecas during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, May, averages 28.1 °C. Nights average below 18 °C in every month of the season, from 7.1 °C to 13.4 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
February	21.8	7.1	14	2	11:24
March	24.6	9	4	1	12:00
April	26.5	11	7	2	12:40
May	28.1	13.2	17	4	13:13
June	26.5	13.4	64	10	13:31
July	24.2	12.5	114	15	13:24
August	24.5	12.6	85	13	12:56
September	22.6	12	101	14	12:18
October	22.5	10.3	29	7	11:39
November	21.5	8.3	19	3	11:03

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Zacatecas, Torreón is 25 days earlier and Morelia 56 days later.

City	Distance	Date	Difference
Aguascalientes	104 km	8 February – 2 September	13 days earlier
San Luis Potosí	178 km	7 March – 5 September	14 days later
Durango	254 km	19 February – 29 August	2 days earlier
Torreón	320 km	27 January – 6 September	25 days earlier
Saltillo	337 km	27 February – 17 August	6 days later
Morelia	371 km	18 April – 12 September	56 days later

Where to buy watermelon plants and seeds near Zacatecas

Buy plants ready to set out from 21 February to 17 August (from 31 January to 17 August for an unheated greenhouse); seed for raising your own is sown from 3 January to 20 July. Within 15 km of Zacatecas OpenStreetMap lists 3 markets (collected 27 October 2026).

Mercado Genaro Codina — market
1 km
González Ortega Mercado — market
1 km
Mercado Roberto del Real Carranza — market
2 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