Michigan’s Peak Bird Spring Migration Is Here, 15 Million Birds Overnight

The arrival of spring has plenty of indicators: flowers blooming, temperatures rising, and the sound of birds in the morning. The birds that flew south for the winter have been slowly making their way back up north for the summer months. A migration that began in April is escalating as May begins.

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Now halfway through May, the bird migration begins to peak with millions of birds flying over the state overnight, and Michigan is about to see its peak. Here's what that means for us.

Michigan's Spring Bird Migration 2026

As of this weekend, Michigan's bird migration numbers will surpass 100 million birds entering Michigan since the beginning of March, according to Birdcast. Birdcast is a live dashboard originally created by the Cornell Lab of Ornithology and the University of Mass. Amherst, and Oregon State University, which tracks bird migrations in real time.

READ MORE: Birds That Do NOT Migrate South During Michigan Winters

Birds like the American Redstart, Great Crested Flycatcher, and Black-throated Green Warbler are among the birds that arrive overnight. On May 14th, Birdcast estimated that a whopping 16.7 million birds arrived in the state overnight, and that number will continue for most of this weekend.

It is only a portion of the 1 billion birds expected to migrate this weekend all across the contiguous United States, if Birdcast estimates hold up. After sunset, migration spikes, so much of it goes unseen by the human eye.

Even if we don't see the migration, there's a good chance you'll hear new bird songs in the coming weeks.