Monarch butterfly population surges 176% at Mexico wintering grounds
Monarch butterfly populations surged dramatically at their Mexican wintering grounds, with overwintering colony area jumping 176% in a single season — from 0.22 hectares to 4.01 hectares. This remarkable rebound follows decades of steep decline that led the IUCN to list migratory monarchs as endangered in 2022. Researchers credit favorable weather, improved milkweed availability across North American prairies, reduced logging pressure, and sustained cross-border conservation cooperation among the U.S., Canada, and Mexico. While significant work remains to reach full recovery, the surge demonstrates that monarch populations can genuinely respond when humans act.









