When to plant watermelons in Saltillo: 27 February – 17 August

In Saltillo, watermelon: sow for seedlings from 9 January to 20 July; plant into a greenhouse from 6 February to 17 August; plant out into open ground from 27 February to 17 August.

Watermelon in Saltillo: soil, season and weather

In Saltillo frost, not soil, sets the date: the top 7 cm of soil warms to 18 °C — the minimum on the watermelon card — around 18 February, 2 days before the last frost on 20 February, so planting waits only for the week after that frost.

Last spring frost	20 February
Top 7 cm of soil at 18 °C	18 February, 2 days before the last frost
Into an unheated greenhouse	6 February – 17 August; February outside: 7.8 °C at night, 22 °C by day; card 18–35 °C
First autumn frost	26 November, 272 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	27 April – 15 October
Days left for picking	213
Daylight	10:58 on 30 January, 11:35 on 27 February
Watering outdoors when fruiting (card)	every 5 days; the driest month, February, has 2 rainy days

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

Watermelon in Saltillo: care after planting

Planted on 27 February: in the first weeks water every 5 days.

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

27 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 Saltillo during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, May, averages 29 °C. Nights average below 18 °C in every month of the season, from 7.8 °C to 16.6 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
February	22	7.8	11	2	11:18
March	24.5	10.2	16	3	11:59
April	27	13.1	20	5	12:45
May	29	15.9	32	9	13:22
June	28.7	16.6	44	8	13:43
July	27.3	16.6	65	11	13:35
August	27.5	16.6	49	9	13:03
September	24.7	15.2	89	13	12:19
October	23.3	12.1	33	6	11:35
November	21.2	9.3	22	5	10:55

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Saltillo, Torreón is 31 days earlier and San Luis Potosí 8 days later.

City	Distance	Date	Difference
Monterrey	72 km	4 February – 13 September	23 days earlier
Torreón	245 km	27 January – 6 September	31 days earlier
Nuevo Laredo	270 km	3 February – 13 September	24 days earlier
Reynosa	280 km	29 January – 13 September	29 days earlier
Zacatecas	337 km	21 February – 17 August	6 days earlier
San Luis Potosí	365 km	7 March – 5 September	8 days later

Where to buy watermelon plants and seeds near Saltillo

Buy plants ready to set out from 27 February to 17 August (from 6 February to 17 August for an unheated greenhouse); seed for raising your own is sown from 9 January to 20 July. Within 15 km of Saltillo OpenStreetMap lists 3 markets (collected 27 October 2026).

Mercado de Finde — market
Sat, Sun 07:00–13:00 · 8 km
Nuevo Mercado Municipal — market
2 km
Centro Comercial Francisco I. Madero — market
3 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