A February Freeze — and Snow in Rome

We picture the olive as a sun-lover undone by drought. But an untimely hard frost can be just as deadly — and in February 2018 a Siberian air mass brought snow to Rome and killed wood and buds across Italy’s groves, opening the worst olive year in a generation.

Every few winters a mass of frigid Siberian air slides west across Europe and does something the Mediterranean is not built for: it freezes. In late February 2018 that air reached central Italy, dusting Rome with a rare fall of snow and settling hard frost over olive country. It looked charming in the photographs. It was anything but charming in the groves, where sub-zero cold splits wood, kills buds and can set a tree back for years. This was the opening act of a brutal season — frost first, then a scorching summer, then autumn floods — that together cut Italy’s harvest by well over half.

Why frost, not just drought, frightens growers

Ask most people what threatens an olive tree and they will say heat and drought. The tree’s real enemy is the wrong weather at the wrong moment, and cold is near the top of the list. The olive is evergreen and tender in a way that fools people: a sharp frost — roughly below about minus seven or minus ten Celsius, depending on how long it lasts and how hardened the tree is — freezes the water in living tissue, bursting cells, killing young wood, and sometimes splitting the trunk itself. A tree that loses its canopy to frost does not simply bounce back next spring; it can take several seasons to rebuild fruiting wood. That is why a single bad cold snap echoes through harvests for years.

2018: climate whiplash in a single country

What made 2018 so instructive was that Italy took every kind of blow in one calendar year. The February freeze weakened the trees; a fierce summer heatwave stressed them further and aborted fruit; and catastrophic rain and flooding in October and November spoiled much of what survived. The result, by the industry’s own reckoning, was a fall of about 57% to roughly 185,000 tonnes — the worst Italian olive harvest in around 25 years, and a loss estimated near a billion euros. Puglia, which grows most of the country’s oil, was hit hardest of all, its centuries-old groves already reeling from disease.

What it means for what you pay

Here is the through-line the headlines miss. A year like 2018 does not end when the weather clears; it lodges itself in the price you pay two and three years later, because damaged trees crop poorly long after the frost is forgotten. Concentrate the world’s finest oil in a narrow band of climate-exposed Mediterranean hillside and you get exactly this: spectacular oil in good years, and gut-punch shortfalls when the weather turns. The cheap, dependable olive oil of the 2000s is not coming back, and seasons like 2018 are a large part of the reason.

The takeaways

• Frost, not only drought, is a first-rank threat to olives — cold splits wood and kills buds.
• A hard freeze damages fruiting wood for several seasons, not just one harvest.
• 2018 stacked frost, heat and floods in a single year — the pattern of the new normal.
• Weather shocks show up in the price of oil years later, once you factor in slow recovery.

The 2018 Italian freeze: common questions

Drawn from contemporary reporting on the February 2018 cold wave and Italy’s 2018 harvest, including Smithsonian Magazine’s coverage of the crop collapse.