Record-Breaking Heat Waves Add to Risks for Western Monarchs

Inside Climate News · By Liza Gross · last updated October 9, 2024 – 2:04 AM

The increasing intensity and frequency of extreme heat likely compounds stresses on the iconic butterfly, worrying biologists about how the struggling population will respond.

By Liza Gross

About a week ago, several monarch caterpillars were busily munching on the native narrowleaf milkweed I’d planted in my backyard in the San Francisco Bay Area to provide habitat for the imperiled pollinators. Then a record-breaking fall heat wave triggered warnings about extremely dangerous temperatures across the region.

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