Antarctica Once Had Rainforests Near the South Pole. Seriously.
Today’s Flashback Friday comes with extra jungle juice for thee brain: Antarctica was not always the giant white freezer sitting at the bottom of the planet. During the age of the dinosaurs, parts of the continent supported temperate, swampy rainforest astonishingly close to the South Pole.
And this is not one of those “scientists imagine what maybe could have happened” situations. Researchers have pulled up fossil forest soil, roots, pollen and spores from beneath the seafloor off West Antarctica — physical evidence of a landscape that existed roughly 90 million years ago.
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When Antarctica Was Green
The ice came much later. Dig into the published science behind Antarctica's ancient rainforest, then explore more prehistoric Earth history.
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The major clue came from a sediment core recovered near West Antarctica’s Pine Island Glacier. CT scans revealed a dense network of preserved roots inside an ancient soil layer, while pollen and spores showed that a genuine forest ecosystem had once grown there. The research, published in Nature, places that temperate rainforest environment between about 92 and 83 million years ago.
The South Pole Had Trees — and Months Without Sunlight
Here’s where thee science brain juice gets especially good. The forest grew at a palaeolatitude of roughly 82 degrees south, only about 900 kilometres from the South Pole. That meant the ecosystem still had to survive the polar night — months each year with no sunlight at all.
Yet the climate was dramatically warmer than modern Antarctica. Researchers reconstructed an annual mean air temperature of around 12°C / 54°F, with summer temperatures averaging about 19°C / 66°F. Rivers and swamps could reach roughly 20°C / 68°F. In other words: not exactly Miami, but absolutely not today’s Antarctic ice kingdom either.
The reason was an Earth operating under very different conditions. The mid-Cretaceous was one of the warmest stretches of the past 140 million years. Atmospheric carbon dioxide was far higher, and the evidence indicates there was no major Antarctic ice sheet covering the region the way there is now.
It also puts the modern continent into perspective. Antarctica’s permanent ice sheets did not simply exist forever. The planet changed, atmospheric conditions changed, ocean circulation changed, and eventually the deep freeze took over. The white landscape we know is one chapter of a much longer story.
So yes: way back when, Antarctica had forests. Not tropical coconut-palms-on-the-beach jungle, but a lush temperate rainforest ecosystem growing astonishingly close to the South Pole. Believe it or not, thee rocks kept receipts.
Watch Mr. Science Explain When Antarctica Was a Jungle
Mr. Science’s August 2026 deep dive breaks down the prehistoric climate, forests and fossil evidence behind Antarctica’s dramatically greener past.
Sources: Mr. Science, When Antarctica Was a Jungle; British Antarctic Survey; Nature.
