Greenly
EN

Monterrey: frost dates

Mexico

In Monterrey the last spring frost usually comes around 18 January and the first autumn frost around 23 December, which leaves about 339 frost-free days (median of 2016–2025). Tomato seedlings can go into open ground around 25 January.

Last spring frostaround 18 January
First autumn frostaround 23 December
Frost-free days339 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 to sow and plant

CropSow for seedlingsPlant out in a greenhouseOpen ground
Bell Pepper1 November14 January4 February
Chili Pepper15 November28 January18 February
Corn—4 Januarysow 25 January
Cucumber3 December14 January4 February
Eggplant5 November14 January4 February
Green Beans28 November4 January25 January
Melon23 November14 January4 February
Peas—7 Decembersow 28 December
Physalis20 November4 January25 January
Pumpkin28 November4 January25 January
Sweet Corn—4 Januarysow 25 January
Tomato8 November4 January25 January
Watermelon13 December14 January4 February
Zucchini3 December4 January25 January

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.

Planted in autumn

CropPlant around
Crocus23 November
Daffodil23 November
Garlic23 November
Hyacinth23 November
Lily23 November
Tulip23 November

A month before the first autumn frost, so the roots grow before winter.

Other cities