GreenlyMonterrey: 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 frost | around 18 January |
|---|---|
| First autumn frost | around 23 December |
| Frost-free days | 339 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
| Crop | Sow for seedlings | Plant out in a greenhouse | Open ground |
|---|---|---|---|
| Achocha | 25 November | 4 January | 25 January |
| Arugula | — | 7 December | sow 28 December |
| Basil | 7 December | 14 January | 4 February |
| Beet | — | 7 December | sow 28 December |
| Bell Pepper | 1 November | 14 January | 4 February |
| Black-eyed Susan | 24 November | — | 25 January |
| Bok Choy | 30 November | 4 January | 25 January |
| Broad bean | — | 7 December | sow 28 December |
| Broccoli | — | 7 December | sow 28 December |
| Brussels Sprouts | 23 October | 7 December | 28 December |
| Cabbage | — | 7 December | sow 28 December |
| Calendula | — | 7 December | sow 28 December |
| Carrot | — | — | sow 28 December |
| Cauliflower | 26 October | 7 December | 28 December |
| Celeriac | 19 October | 4 January | 25 January |
| Celery | 19 October | 4 January | 25 January |
| Celosia | 20 November | 4 January | 25 January |
| Chamomile | — | 7 December | sow 28 December |
| Chayote | 8 October | 4 January | 25 January |
| Chickpea | — | — | sow 28 December |
| Chili Pepper | 15 November | 28 January | 18 February |
| China aster | 23 November | 14 January | 4 February |
| Chives | — | — | sow 28 December |
| Cilantro | — | 7 December | sow 28 December |
| Corn | — | 4 January | sow 25 January |
| Cosmos | 20 November | 4 January | 25 January |
| Cucumber | 3 December | 14 January | 4 February |
| Daikon | — | 7 December | sow 28 December |
| Delphinium | 30 October | — | 28 December |
| Dill | — | 7 December | sow 28 December |
| Eggplant | 5 November | 14 January | 4 February |
| Florence fennel | 20 November | 4 January | 25 January |
| Garden sorrel | — | 7 December | sow 28 December |
| Green Beans | 28 November | 4 January | 25 January |
| Hyssop | — | — | sow 28 December |
| Kale | — | 7 December | sow 28 December |
| Kiwano | 3 December | 4 January | 25 January |
| Kohlrabi | — | 7 December | sow 28 December |
| Leek | 28 September | 7 December | 28 December |
| Lemon balm | — | 7 December | sow 28 December |
| Lettuce | — | 7 December | sow 28 December |
| Lisianthus | 11 September | 7 December | 28 December |
| Lovage | — | — | sow 28 December |
| Luffa | 3 December | 14 January | 4 February |
| Marigold | 23 November | 4 January | 25 January |
| Melon | 23 November | 14 January | 4 February |
| Microgreens | — | 4 January | sow 25 January |
| Moringa | 4 December | 28 January | 18 February |
| Mustard greens | — | 7 December | sow 28 December |
| Napa cabbage | 2 December | 4 January | 25 January |
| Nasturtium | 27 November | 4 January | 25 January |
| Okra | 3 December | 14 January | 4 February |
| Oregano | 8 October | 7 December | 28 December |
| Pansy | 12 October | 7 December | 28 December |
| Parsley | — | 7 December | sow 28 December |
| Parsnip | — | — | sow 28 December |
| Peanut | 8 December | 14 January | 4 February |
| Peas | — | 7 December | sow 28 December |
| Petunia | 12 November | 14 January | 4 February |
| Physalis | 20 November | 4 January | 25 January |
| Pumpkin | 28 November | 4 January | 25 January |
| Purple coneflower | 27 October | — | 28 December |
| Radish | — | — | sow 28 December |
| Sage | 19 October | 7 December | 28 December |
| Snapdragon | 3 October | 7 December | 28 December |
| Spinach | — | 7 December | sow 28 December |
| Stevia | 16 November | 4 January | 25 January |
| Stock | — | 7 December | sow 28 December |
| Sunflower | — | 4 January | sow 25 January |
| Sweet Corn | — | 4 January | sow 25 January |
| Sweet pea | 26 October | 7 December | 28 December |
| Sweet William | — | — | sow 28 December |
| Swiss Chard | — | 7 December | sow 28 December |
| Thyme | — | 7 December | sow 28 December |
| Tomato | 8 November | 4 January | 25 January |
| Turnip | — | 7 December | sow 28 December |
| Watercress | — | 7 December | sow 28 December |
| Watermelon | 13 December | 14 January | 4 February |
| Zinnia | 24 December | 28 January | 18 February |
| Zucchini | 3 December | 4 January | 25 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.
Monterrey: weather for the next 7 days
Forecast by Open-Meteo. Nights at or below 0 °C are marked as frost.
Planted in autumn
| Crop | Plant around |
|---|---|
| Bearded Iris | 23 November |
| Crocus | 23 November |
| Daffodil | 23 November |
| Garlic | 23 November |
| Hyacinth | 23 November |
| Lily | 23 November |
| Peony | 23 November |
| Saffron | 23 November |
| Tulip | 23 November |
| Wild garlic | 23 November |
A month before the first autumn frost, so the roots grow before winter.