Last and first frost dates in Las Piedras

When is the last frost in Las Piedras?

The last frost in Las Piedras usually comes around 11 July: 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 20 June, while corn waits until 21 July.

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 Las Piedras

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 2 days before the last spring frost and 15 °C 66 days after it.

Frost dates near Las Piedras

Of the nearest cities on our list, the last spring frost ends earliest in Colonia del Sacramento (9 July) and latest in La Plata (30 July).

Weather in Las Piedras by month

Average weather in Las Piedras over 2016–2025: the warmest month is January. Months that average 20 °C or more by day: October–April (21.1–28.8 °C). No month averages below 0 °C at night; the coldest nights, in July, average 7.3 °C. About 1023 mm of rain falls in a year, on 103 days; April is the wettest month (111 mm) and September the driest (63 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).