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Migration draws near in the West

August 12, 2025 by Gail Morris, Southwest Monarch Study coordinator

Breeding monarchs continue to cover western states as their inner call to the fall migration draws near. Eggs and larvae feeding on milkweed across the region are now likely part of the migratory generation and in time, as adults, will launch into their flight, heading south and voraciously consuming fall bloom nectar to fuel their journey. This is a perilous time when a simple change in temperature and weather conditions can help larvae flourish or languish. We’ll see how this tipping point impacts monarchs in the coming weeks.

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