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Last and first frost dates in San Luis Potosí

Mexico

In San Luis Potosí the last spring frost usually comes around 28 February and the first autumn frost around 15 December, which leaves about 290 frost-free days (median of 2016–2025). Tomato seedlings can go into open ground from 7 March to 25 August.

Last spring frostaround 28 February
First autumn frostaround 15 December
Frost-free days290 days

Median of 2016–2025 for the 25 km grid cell of the city: the last day at or below 0 °C in spring and the first in autumn (ERA5 reanalysis via Open-Meteo). In a cold year a frost can come a week or two later — Greenly warns 48 hours ahead.

When is the last frost in San Luis Potosí?

The last frost in San Luis Potosí usually comes around 28 February: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 7 February, while corn waits until 7 March. The first autumn frost follows around 15 December, about 290 days later: harvest or cover frost-tender crops before then.

When to sow and plant

CropSow for seedlingsPlant out in a greenhouseOpen ground
Achocha5 January – 6 September14 February – 16 October7 March – 16 October
Ageratumfrom 20 December—from 7 March
Arugula——sow 7 February – 10 November
Basil7 January – 13 October14 February – 20 November7 March – 20 November
Beet——sow 7 February – 16 October
Bell Pepper16 December – 26 June14 February – 25 August7 March – 25 August
Black-eyed Susanfrom 14 December—from 7 March
Bok Choy10 January – 24 October14 February – 28 November7 March – 28 November
Borage——sow 7 March – 21 October
Broad bean——sow 7 February – 6 September
Broccoli——sow 7 February – 30 August
Brussels Sprouts3 December – 28 July17 January – 11 September7 February – 11 September
Busy Lizziefrom 13 December—from 7 March
Cabbage——sow 7 February – 7 August
Calendula——sow from 7 February
Carrot——sow 7 February – 22 September
Cauliflower6 December – 30 August17 January – 11 October7 February – 11 October
Celeriac29 November – 27 June14 February – 12 September7 March – 12 September
Celery29 November – 7 July14 February – 22 September7 March – 22 September
Celosiafrom 31 Decemberfrom 14 Februaryfrom 7 March
Chamomile——sow 7 February – 11 October
Chayote18 November – 20 June14 February – 16 September7 March – 16 September
Chickpea——sow 7 February – 27 August
Chicory23 December – 21 September—7 February – 16 October
Chili Pepper16 December – 2 August14 February – 1 October7 March – 1 October
China asterfrom 24 Decemberfrom 14 Februaryfrom 7 March
Chives——sow 7 February – 2 October
Cilantro——sow 7 February – 12 October
Corn——sow 7 March – 27 August
Corn poppy——sow from 7 February
Cosmosfrom 31 Decemberfrom 14 Februaryfrom 7 March
Cucumber17 January – 2 September14 February – 30 September7 March – 30 September
Daikon——sow 7 February – 9 October
Delphiniumfrom 19 November—from 7 February
Dill——sow 7 February – 22 October
Edging lobeliafrom 13 December—from 7 March
Eggplant16 December – 26 June14 February – 25 August7 March – 25 August
Florence fennel31 December – 6 September14 February – 21 October7 March – 21 October
Foxglovefrom 1 November—from 7 February
Garden sorrel——sow 7 February – 10 October
Green Beans——sow 7 March – 4 September
Hollyhock——sow from 7 February
Hyssop——sow 7 February – 2 September
Kale——sow 7 February – 4 October
Kiwano13 January – 9 September14 February – 11 October7 March – 11 October
Kohlrabi——sow 7 February – 14 October
Leek8 November – 18 June17 January – 27 August7 February – 27 August
Lemon balm——sow 7 February – 6 October
Lettuce——sow 7 February – 19 October
Lisianthusfrom 22 Octoberfrom 17 Januaryfrom 7 February
Lovage——sow from 7 February
Luffa3 January – 4 July14 February – 15 August7 March – 15 August
Marigoldfrom 3 Januaryfrom 14 Februaryfrom 7 March
Marjoram16 December – 21 September—7 March – 20 November
Melon17 January – 20 August14 February – 17 September7 March – 17 September
Microgreens——sow 7 March – 1 December
Moringa21 December – 26 September14 February – 20 November7 March – 20 November
Moss rosefrom 20 December—from 7 March
Mustard greens——sow 7 February – 31 October
Napa cabbage12 January – 1 October14 February – 3 November7 March – 3 November
Nasturtiumfrom 7 Januaryfrom 14 Februaryfrom 7 March
Okra3 January – 14 September14 February – 26 October7 March – 26 October
Oregano18 November – 11 September17 January – 10 November7 February – 10 November
Pansyfrom 22 Novemberfrom 17 Januaryfrom 7 February
Parsley——sow 7 February – 30 September
Parsnip——sow 7 February – 19 August
Peanut8 January – 10 August14 February – 16 September7 March – 16 September
Peas——sow 7 February – 2 October
Petuniafrom 13 Decemberfrom 14 Februaryfrom 7 March
Physalis31 December – 7 August14 February – 21 September7 March – 21 September
Pumpkin3 January – 9 July14 February – 20 August7 March – 20 August
Purple coneflowerfrom 16 November—from 7 February
Radish——sow 7 February – 15 November
Sage29 November – 7 September17 January – 26 October7 February – 26 October
Scarlet sagefrom 24 December—from 7 March
Snapdragonfrom 13 Novemberfrom 17 Januaryfrom 7 February
Soybean——sow 7 March – 26 September
Spinach——sow 7 February – 21 October
Stevia27 December – 29 July14 February – 16 September7 March – 16 September
Stock——sow from 7 February
Sunflower——sow from 7 March
Sweet alyssum——sow from 7 February
Sweet Corn23 January – 21 September14 February – 13 October7 March – 13 October
Sweet peafrom 6 Decemberfrom 17 Januaryfrom 7 February
Sweet William——sow from 7 February
Swiss Chard——sow 7 February – 16 October
Thyme——sow 7 February – 27 August
Tomato24 December – 4 July14 February – 25 August7 March – 25 August
Turnip——sow 7 February – 18 October
Watercress——sow 7 February – 29 October
Watermelon17 January – 8 August14 February – 5 September7 March – 5 September
Zinniafrom 10 Januaryfrom 14 Februaryfrom 7 March
Zucchini24 January – 7 September14 February – 28 September7 March – 28 September

Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day. 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.

When the soil warms up in San Luis Potosí

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo).

SoilDateAgainst the last spring frost
5 °Calready in the first week of January—
10 °Calready in the first week of January—
15 °Calready in the first week of January—
18 °C9 February19 days earlier

Frost dates near San Luis Potosí

Of the nearest cities on our list, the last spring frost ends earliest in Aguascalientes (6 January) and latest in Zacatecas (29 January).

CityDistanceLast spring frostFirst autumn frost
León135 km—15 December
Aguascalientes137 km6 January12 December
Irapuato169 km——
Zacatecas178 km29 January26 November
Celaya182 km——

Seeds, seedlings and markets in San Luis Potosí

Within 15 km of San Luis Potosí OpenStreetMap lists 3 garden centres and 10 markets (collected 20 October 2026). The nearest garden centre to the city centre is Savia Forestal Jardinera Integral, 2 km away.

Places: © OpenStreetMap contributors, ODbL.

What to grow at home in winter in San Luis Potosí

Frosts in San Luis Potosí usually come from about 15 December to about 28 February. These plants have indoor care in their Greenly cards and are harvested quickly, so they can be sown on a windowsill in winter.

Weather in San Luis Potosí by month

Average weather in San Luis Potosí over 2016–2025: the warmest month is May. Months that average 20 °C or more by day: January–December (21.9–30.6 °C). Months that average 30 °C or more by day: May (30.6 °C). No month averages below 0 °C at night; the coldest nights, in January, average 7.1 °C. About 375 mm of rain falls in a year, on 70 days; September is the wettest month (71 mm) and March the driest (5 mm).

MonthDay, °CNight, °CRain, mmRainy days
January21.97.172
February24.78.682
March27.810.551
April29.612.9144
May30.615.1356
June27.815.56413
July26.7156110
August27.115.1498
September25.514.67112
October24.512.4357
November23.59.8163
December21.98102

Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).

Planted in autumn

CropWhen to plant
Bearded Irisby 15 November
Crocusby 15 November
Daffodilby 15 November
Garlicby 15 November
Grape hyacinthby 15 November
Helleboreby 15 November
Hyacinthby 15 November
Lilyby 15 November
Ornamental onionby 15 November
Peonyby 15 November
Saffronby 15 November
Snowdropby 15 November
Tulipby 15 November
Wild garlicby 15 November

From a month before the first autumn frost, so the roots grow before winter, to the late-planting limit on each crop’s page (about two weeks before the ground freezes, by ten years of weather).