Last and first frost dates in Rancagua

When is the last frost in Rancagua?

The last frost in Rancagua usually comes around 18 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 28 July, while corn waits until 16 September. The first autumn frost follows around 12 June, about 298 days later: harvest or cover frost-tender crops before then.

When to sow and plant

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 Rancagua

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 5 days after the last spring frost and 15 °C 60 days after it.

Frost dates near Rancagua

Of the nearest cities on our list, the last spring frost ends earliest in Valparaíso (6 August) and latest in Curicó (25 August).

Seeds, seedlings and markets in Rancagua

Within 15 km of Rancagua OpenStreetMap lists 8 garden centres, 2 farm-supply shops, 1 plant nursery, 2 markets and 1 farm shop (collected 27 October 2026). The nearest garden centre to the city centre is Jardín Rosal de Las Mercedes, 11 km away.

• Jardín Rosal de Las Mercedes — garden centre
  Manuel Cavieres 21 · 11 km · jardinrosaldelasmercedes.cl
• Ce Ele! — market
  Avenida Einstein 859 · Mon–Sun 11:00–00:00 · 2 km
• Vivero Karü — garden centre
  Mon–Fri 08:00–18:00; Sat, Sun 09:00–18:00; public holidays closed · 11 km · viverohappygreen.cl
• Vega Baquedano — market
  General Baquedano · 3 km
• Jardín Las Palmeras — garden centre
  Pablo Rubio 299 · 15 km

• Where to buy seeds and seedlings in Rancagua
• Selling your own harvest in Chile

Places: © OpenStreetMap contributors, ODbL.

Weather in Rancagua by month

Average weather in Rancagua over 2016–2025: the warmest month is January. Months that average 20 °C or more by day: October–April (20.9–29.6 °C). No month averages below 0 °C at night; the coldest nights, in July, average 4.3 °C. About 645 mm of rain falls in a year, on 55 days; June is the wettest month (149 mm) and December the driest (5 mm).

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

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).