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Last and first frost dates in Santa Rosa

Argentina

In Santa Rosa the last spring frost usually comes around 25 August and the first autumn frost around 13 June, which leaves about 292 frost-free days (median of 2016–2025). Tomato seedlings can go into open ground from 22 September to 21 February.

Last spring frostaround 25 August
First autumn frostaround 13 June
Frost-free days292 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 Santa Rosa?

The last frost in Santa Rosa usually comes around 25 August: 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 4 August, while corn waits until 6 September. The first autumn frost follows around 13 June, about 292 days later: harvest or cover frost-tender crops before then.

When to sow and plant

CropSow for seedlingsPlant out in a greenhouseOpen ground
Achocha2 July – 4 March11 August – 13 April1 September – 13 April
Ageratumfrom 7 July—from 22 September
Arugula——sow 4 August – 8 May
Basil24 August – 10 April1 October – 18 May22 October – 18 May
Beet——sow 4 August – 13 April
Bell Pepper2 August – 23 December1 October – 21 February22 October – 21 February
Black-eyed Susanfrom 10 June—from 1 September
Bok Choy7 July – 21 April11 August – 26 May1 September – 26 May
Borage——sow 1 September – 18 April
Broad bean——sow 4 August – 4 March
Broccoli——sow 4 August – 26 February
Brussels Sprouts30 May – 24 January14 July – 9 March4 August – 9 March
Busy Lizziefrom 9 June—from 1 September
Cabbage——sow 4 August – 3 February
Calendula——sow from 4 August
Carrot——sow 4 August – 20 March
Cauliflower2 June – 26 February14 July – 8 April4 August – 8 April
Celeriac26 May – 24 December11 August – 10 March1 September – 10 March
Celery26 May – 3 January11 August – 20 March1 September – 20 March
Celosiafrom 27 Julyfrom 10 Septemberfrom 1 October
Chamomile——sow 4 August – 8 April
Chayote20 May – 17 December16 August – 14 March6 September – 14 March
Chickpea——sow 4 August – 23 February
Chicory19 June – 19 March—4 August – 13 April
Chili Pepper2 August – 29 January1 October – 29 March22 October – 29 March
China asterfrom 10 Augustfrom 1 Octoberfrom 22 October
Chives——sow 4 August – 30 March
Cilantro——sow 4 August – 9 April
Corn——sow 6 September – 23 February
Corn poppy——sow from 4 August
Cosmosfrom 27 Julyfrom 10 Septemberfrom 1 October
Cucumber3 September – 29 February1 October – 28 March22 October – 28 March
Daikon——sow 4 August – 6 April
Delphiniumfrom 16 May—from 4 August
Dill——sow 4 August – 19 April
Edging lobeliafrom 9 June—from 1 September
Eggplant2 August – 23 December1 October – 21 February22 October – 21 February
Florence fennel27 June – 4 March11 August – 18 April1 September – 18 April
Foxglovefrom 28 April—from 4 August
Garden sorrel——sow 4 August – 7 April
Green Beans——sow 1 October – 2 March
Hollyhock——sow from 4 August
Hyssop——sow 4 August – 29 February
Kale——sow 4 August – 1 April
Kiwano31 July – 7 March1 September – 8 April22 September – 8 April
Kohlrabi——sow 4 August – 11 April
Leek5 May – 15 December14 July – 23 February4 August – 23 February
Lemon balm——sow 4 August – 3 April
Lettuce——sow 4 August – 16 April
Lisianthusfrom 18 Aprilfrom 14 Julyfrom 4 August
Lovage——sow from 4 August
Luffa20 August – 31 December1 October – 11 February22 October – 11 February
Marigoldfrom 30 Junefrom 11 Augustfrom 1 September
Marjoram2 August – 19 March—22 October – 18 May
Melon3 September – 16 February1 October – 15 March22 October – 15 March
Microgreens——sow 1 October – 29 May
Moringa23 August – 24 March17 October – 18 May7 November – 18 May
Moss rosefrom 16 June—from 1 September
Mustard greens——sow 4 August – 28 April
Napa cabbage9 July – 29 March11 August – 1 May1 September – 1 May
Nasturtiumfrom 4 Julyfrom 11 Augustfrom 1 September
Okra20 August – 12 March1 October – 23 April22 October – 23 April
Oregano15 May – 9 March14 July – 8 May4 August – 8 May
Pansyfrom 19 Mayfrom 14 Julyfrom 4 August
Parsley——sow 4 August – 28 March
Parsnip——sow 4 August – 15 February
Peanut25 August – 6 February1 October – 14 March22 October – 14 March
Peas——sow 4 August – 30 March
Petuniafrom 30 Julyfrom 1 Octoberfrom 22 October
Physalis18 July – 3 February1 September – 19 March22 September – 19 March
Pumpkin20 August – 5 January1 October – 16 February22 October – 16 February
Purple coneflowerfrom 13 May—from 4 August
Radish——sow 4 August – 13 May
Sage26 May – 5 March14 July – 23 April4 August – 23 April
Scarlet sagefrom 11 July—from 22 September
Snapdragonfrom 10 Mayfrom 14 Julyfrom 4 August
Soybean——sow 22 October – 24 March
Spinach——sow 4 August – 18 April
Stevia14 July – 25 January1 September – 14 March22 September – 14 March
Stock——sow from 4 August
Sunflower——sow from 1 October
Sweet alyssum——sow from 4 August
Sweet Corn30 July – 19 March21 August – 10 April11 September – 10 April
Sweet peafrom 2 Junefrom 14 Julyfrom 4 August
Sweet William——sow from 4 August
Swiss Chard——sow 4 August – 13 April
Thyme——sow 4 August – 23 February
Tomato11 July – 31 December1 September – 21 February22 September – 21 February
Turnip——sow 4 August – 15 April
Watercress——sow 4 August – 26 April
Watermelon3 September – 4 February1 October – 3 March22 October – 3 March
Zinniafrom 12 Septemberfrom 17 Octoberfrom 7 November
Zucchini10 September – 5 March1 October – 26 March22 October – 26 March

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 Santa Rosa

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo). The soil reaches 10 °C 19 days before the last spring frost and 15 °C 28 days after it.

SoilDateAgainst the last spring frost
5 °Calready in the first week of July—
10 °C6 August19 days earlier
15 °C22 September28 days later
18 °C22 October58 days later

Frost dates near Santa Rosa

Of the nearest cities on our list, the last spring frost ends earliest in Bahía Blanca (8 August) and latest in General Roca (25 August).

CityDistanceLast spring frostFirst autumn frost
Bahía Blanca293 km8 August15 June
Venado Tuerto382 km10 August17 June
Río Cuarto388 km15 August14 June
General Roca394 km25 August1 June
San Luis414 km21 August23 June

Seeds, seedlings and markets in Santa Rosa

Within 15 km of Santa Rosa OpenStreetMap lists 2 garden centres, 4 farm-supply shops, 2 plant nurseries and 1 market (collected 28 October 2026). The nearest plant nursery to the city centre is Vivero Forestal Provincial Santa Rosa, 3 km away.

Places: © OpenStreetMap contributors, ODbL.

What to grow at home in winter in Santa Rosa

Frosts in Santa Rosa usually come from about 13 June to about 25 August. 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 Santa Rosa by month

Average weather in Santa Rosa over 2016–2025: the warmest month is January. Months that average 20 °C or more by day: October–April (21.1–30.5 °C). Months that average 30 °C or more by day: January (30.5 °C). No month averages below 0 °C at night; the coldest nights, in July, average 3.9 °C. About 644 mm of rain falls in a year, on 73 days; March is the wettest month (90 mm) and June the driest (17 mm).

MonthDay, °CNight, °CRain, mmRainy days
January30.518.8598
February2917.7777
March25.615.2908
April21.111.7767
May16.57.7295
June13.64.6173
July13.23.9223
August16.55.4204
September19.58.1496
October22.410.7667
November26.314.3758
December29.617647

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 14 May
Crocusby 14 May
Daffodilby 14 May
Garlic14 May – end of June
Grape hyacinthby 14 May
Helleboreby 14 May
Hyacinthby 14 May
Lilyby 14 May
Ornamental onionby 14 May
Peonyby 14 May
Saffronby 14 May
Snowdropby 14 May
Tulipby 14 May
Wild garlicby 14 May

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).