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Buenos Aires: frost dates

Argentina

Last spring frostaround 14 July
First autumn frostnone in ten years

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
Achocha21 May30 June21 July
Arugula—2 Junesow 23 June
Basil9 August16 September7 October
Beet—2 Junesow 23 June
Bell Pepper4 July16 September7 October
Black-eyed Susan20 May—21 July
Bok Choy26 May30 June21 July
Broad bean—2 Junesow 23 June
Broccoli—2 Junesow 23 June
Brussels Sprouts18 April2 June23 June
Cabbage—2 Junesow 23 June
Calendula—2 Junesow 23 June
Carrot——sow 23 June
Cauliflower21 April2 June23 June
Celeriac14 April30 June21 July
Celery14 April30 June21 July
Celosia18 July1 September22 September
Chamomile—2 Junesow 23 June
Chayote3 April30 June21 July
Chickpea——sow 23 June
Chili Pepper16 July28 September19 October
China aster26 July16 September7 October
Chives——sow 23 June
Cilantro—2 Junesow 23 June
Corn—30 Junesow 21 July
Cosmos18 July1 September22 September
Cucumber5 August16 September7 October
Daikon—2 Junesow 23 June
Delphinium25 April—23 June
Dill—2 Junesow 23 June
Eggplant8 July16 September7 October
Florence fennel16 May30 June21 July
Garden sorrel—2 Junesow 23 June
Green Beans24 May30 June21 July
Hyssop——sow 23 June
Kale—2 Junesow 23 June
Kiwano11 July12 August2 September
Kohlrabi—2 Junesow 23 June
Leek24 March2 June23 June
Lemon balm—2 Junesow 23 June
Lettuce—2 Junesow 23 June
Lisianthus7 March2 June23 June
Lovage——sow 23 June
Luffa5 August16 September7 October
Marigold19 May30 June21 July
Melon26 July16 September7 October
Microgreens—1 Septembersow 22 September
Moringa4 August28 September19 October
Mustard greens—2 Junesow 23 June
Napa cabbage28 May30 June21 July
Nasturtium23 May30 June21 July
Okra5 August16 September7 October
Oregano3 April2 June23 June
Pansy7 April2 June23 June
Parsley—2 Junesow 23 June
Parsnip——sow 23 June
Peanut10 August16 September7 October
Peas—2 Junesow 23 June
Petunia15 July16 September7 October
Physalis28 June12 August2 September
Pumpkin6 July12 August2 September
Purple coneflower22 April—23 June
Radish——sow 23 June
Sage14 April2 June23 June
Snapdragon29 March2 June23 June
Spinach—2 Junesow 23 June
Stevia24 June12 August2 September
Stock—2 Junesow 23 June
Sunflower—1 Septembersow 22 September
Sweet Corn—30 Junesow 21 July
Sweet pea21 April2 June23 June
Sweet William——sow 23 June
Swiss Chard—2 Junesow 23 June
Thyme—2 Junesow 23 June
Tomato16 June12 August2 September
Turnip—2 Junesow 23 June
Watercress—2 Junesow 23 June
Watermelon15 August16 September7 October
Zinnia24 August28 September19 October
Zucchini11 July12 August2 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.

Weather in Buenos Aires by month

Average weather in Buenos Aires over 2016–2025: the warmest month is January, the wettest March.

MonthDay, °CNight, °CRain, mmRainy days
January28.521.2739
February27.820.4877
March25.118.51518
April21.315.21169
May17.411.2847
June14.78.3477
July147.7748
August168.8636
September18.211726
October21.213.5909
November24.616.7798
December27.419.1798

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

CropPlant around
Bearded Iris1 April
Crocus1 April
Daffodil1 April
Garlic1 April
Hyacinth1 April
Lily1 April
Peony1 April
Saffron1 April
Tulip1 April
Wild garlic1 April

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

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