Monarch Butterfly Migration Path 2024 Date. Each spring, and back down to warmer climates for winter starting in late august. In the forests of central mexico, where eastern monarch butterflies have long wintered, the species were estimated to occupy a mere 0.9 hectares (2.2 acres) during.

Every year, millions of monarchs migrate from mexico to the u.s. New data detailing the abundance of the eastern monarch butterfly colonies wintering in central mexico’s forests estimate that the species occupied.