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Overwintering season off to a good start at El Rosario

December 11, 2025 by Estela Romero, from the Monarch Butterfly Biosphere Reserve

Forecasted as a very cold winter, with brief but very frequent intervals of drastic drops in temperatures, down to 5°C (40°F), our fantastic monarch butterflies are now fully defining their colonies, increasing in numbers little by little and offering a beautiful scene.

Visitors, including international tourism from Europe heading first now, began to appear really early in the season, “looking for at least a few flying around, so that we can say we could see them!”

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