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Charleston’s First Real Taste of Fall Is Bringing More Than Cooler Weather
Updated: 7 minutes ago
Millions of migrating birds are taking to the skies over the Lowcountry
After months of heat and humidity, Charleston is finally getting its first real taste of fall. A push of cooler air has arrived in the Lowcountry, bringing some of the coolest weather we’ve experienced this season and a welcome break from the summer heat. The National Weather Service described the setup as an unusually strong push of cool weather for early fall.
But we aren’t the only ones responding to the change in weather.
High above Charleston, one of the most remarkable natural events of the year is underway.
Each fall, millions of birds migrate south across North America. And while we may notice a few new birds showing up in our parks, neighborhoods and backyards, much of this incredible journey happens completely out of sight.
It happens at night.
And on Thursday night, I enthusiastically decided to follow along.
With BirdCast forecasting a major migration night over Charleston, I kept an eye on the numbers as darkness fell, stepped outside in the middle of the night to listen for birds passing overhead, and then headed out the following morning to see what migration might look like on the ground.
What unfolded over the next several hours was pretty extraordinary!
More Than 2.7 Million Birds in One Night!
Thursday night was forecast to be a big migration night over Charleston but at first, it didn’t look like it was going to happen.
At 7:50 PM, shortly after migration began, BirdCast estimated that only about 11,200 birds were in flight over Charleston County.
Then things changed dramatically.
By 2:20 AM, more than 1 million birds had already crossed Charleston County, with an estimated 365,400 birds still in flight.
Migration continued building through the night, eventually reaching its peak at 3:40 AM, when BirdCast estimated that 488,200 birds were in flight over Charleston County at the same time. At the peak, birds were moving south-southwest at approximately 35 mph and an estimated altitude of 1,500 feet.
By the time the night’s migration ended Friday morning, BirdCast estimated that an extraordinary 2,767,000 birds had crossed Charleston County.
All of this happened while most of Charleston was asleep.
BirdCast estimated that approximately 2.77 million birds crossed Charleston County during the night of September 24–25, 2026.
How Do We Know They’re Up There?
One of the fascinating things about modern bird migration research is that the same weather radar network used to track rain and storms can also detect birds moving through the atmosphere.
BirdCast uses weather-radar data and migration models to monitor and forecast bird migration across the United States. Its local dashboards estimate how many birds move through a region during the night and even provide information about their direction, speed and altitude.
That gives us a glimpse into a migration that would otherwise be almost completely invisible.
And the numbers can be staggering.
Why Do So Many Birds Migrate at Night?
Many long-distance migrating songbirds including warblers, vireos and thrushes make much of their journey after dark.
Nighttime offers several advantages. Temperatures are cooler, the air can be calmer, there are fewer daytime predators, and birds can use celestial cues to help navigate. Research has also shown that weather conditions can influence when birds decide to begin migratory flights.
BirdCast notes that nocturnal migration often begins shortly after sunset and typically builds during the first few hours of darkness. On this particular night in Charleston, however, the largest movement came much later, with migration peaking at 3:40 AM.
Listen to the Sky
Knowing that so many birds were passing overhead, I wanted to experience some of the migration for myself.
So around 2:40 Friday morning, I stepped outside and listened.
The wind was cool and the sky looked almost completely empty.
But according to BirdCast, hundreds of thousands of birds were moving above Charleston.
Nocturnal flight calls can be incredibly brief and difficult to pick out, so I also used the Merlin Bird ID app as a listening aid. Merlin suggested multiple Bobolink calling during that middle-of-the-night session.
I headed back to bed for while.
At 5:22 AM, I woke up and headed back outside before sunrise, this time with a cup of coffee.
As dawn approached, Merlin suggested several additional species, including American Redstart, Common Yellowthroat, Ovenbird, Bobolink, Veery, Swainson's Thrush and Cape May Warbler.
Not every sound detected by an identification app can be assumed to be a migrating bird, particularly as morning approaches and local birds begin vocalizing. But listening beneath a seemingly empty sky while knowing the scale of the movement happening overhead was remarkable.
By 6:00 AM, BirdCast estimated that more than 2.66 million birds had already crossed Charleston County overnight.
Most people waking up that morning would never know it had happened.
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How Far Can They Fly in a Night?
For many migrating songbirds, a night in the air can mean hours of continuous flight.
How far an individual bird travels depends on the species, weather, winds, geography and its energy reserves. Some birds can cover hundreds of miles during a night of migration before descending again.
And that is only one stage of the journey.
After landing, migrants need places where they can rest and replenish the energy they burned during flight. Some may continue their journey the following night, while others can remain in an area longer before moving on.
That’s one reason the habitat birds find when they descend after a night of migration matters so much.
When Morning Comes
As daylight approaches, nocturnal migrants descend from the sky and begin searching for places to rest and refuel. Cornell notes that migrating birds coming down at dawn use habitat for shelter and to replenish energy before another night’s journey.
And Friday morning, just a few hours after the night’s migration ended, I went looking for them.
After finishing a morning birding tour at Pitt Street Bridge, I headed to Sullivan’s Island and Fort Moultrie to see what might be moving through the maritime forest.
Almost immediately after entering the woods, there were migrants everywhere! It was truly an exhilarating moment, especially after watching the migration numbers build overnight, standing outside listening in the darkness, and now seeing migrating birds throughout the maritime forest.
Many were surprisingly close to the ground. American Redstarts, Ovenbirds and Black-throated Blue Warblers moved through the low vegetation, and for a while I was simply looking in every direction trying to identify all of the birds around me.
During a little more than an hour at Fort Moultrie, I recorded 19 American Redstarts, 13 Common Yellowthroats, 6 Black-throated Blue Warblers, 3 Ovenbirds, 4 Yellow Warblers, 2 Black-and-white Warblers, 2 Palm Warblers, two Prairie Warblers and a Veery, among other species.
The activity continued when I moved onto the Sullivan’s Island Nature Trail, where I encountered more American Redstarts and Common Yellowthroats along with Red-eyed Vireos, Blue-gray Gnatcatchers and another Veery.
Only a few hours earlier, millions of birds had been moving unseen through the darkness above Charleston. Now, standing in the maritime forest on Sullivan’s Island, fall migration was suddenly all around me.
Where to Look for Fall Migrants in Charleston
You don’t have to travel far to experience fall migration in the Lowcountry. Migrating birds can show up almost anywhere there is suitable habitat, but there are a few places around Charleston where I especially enjoy looking for them.
Fort Moultrie and the Sullivan’s Island Nature Trail are two of my favorite places to search for migrating songbirds. The maritime forest can be particularly productive during migration, with birds feeding throughout the canopy, understory and vegetation close to the ground.
Patriots Point can also produce excellent migrant activity in its wooded and brushy areas, while West Ashley Park offers a mixture of mature forest, wetlands and waterways. Farther inland, Ashley River Park in Summerville is another great place to search for migrants among its wooded trails and riverfront habitat.
But these birds certainly aren’t limited to well-known birding locations.
They can appear in neighborhood trees, gardens, city parks and backyards throughout the Charleston area. During migration, sometimes all it takes is slowing down and paying attention.
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One Simple Way to Help Migrating Birds
The fact that so much migration occurs at night also creates challenges.
Artificial light can attract and disorient nocturnal migrants, drawing birds away from their normal routes and increasing their exposure to buildings and window collisions. Research and Lights Out programs have shown that reducing unnecessary nighttime lighting during migration can make a meaningful difference.
For homeowners, one of the simplest things we can do during heavy migration nights is turn off unnecessary outdoor lights and close blinds or curtains when indoor lights are bright. Downward-facing outdoor lighting can also help reduce light escaping into the night sky.
Millions of birds may be passing over our communities while we’re asleep. Small changes can help make their journey a little safer.
Fall Migration Is Happening All Around Us
Fall bird migration in Charleston, SC is one of my favorite times of year to go birding in the Lowcountry. Every morning can bring something different, and you never quite know what may have arrived overnight.
What happened over Charleston this week was an extraordinary reminder of just how much of migration we never see.
The night I followed for this story, 2.767 million birds crossed Charleston County while most of us slept.
And the movement continued. The following night, BirdCast estimated that another 5,359,600 birds crossed Charleston County overnight from September 25–26, nearly twice the number recorded the night before.
The migration continued Saturday night, with another 2,454,300 birds crossing Charleston County from September 26–27. Altogether, BirdCast estimated more than 10.5 million birds crossed Charleston County over those three nights!
A few hours after the first of those nights, I walked into the maritime forest on Sullivan’s Island and found migrating songbirds seemingly everywhere feeding among the trees and low vegetation before continuing journeys that may eventually carry them hundreds or even thousands of miles farther south.
And the migration followed me home.
Later that afternoon, I was watering plants in my backyard when four species of warblers appeared around the small creek and pond habitat my kids and I created: a Yellow Warbler, two Common Yellowthroats, an American Redstart and a Chestnut-sided Warbler! Watching these migrants stop to bathe in the small creek was a pretty special way to end the day.
So over the next few weeks, keep an eye out for birds in the trees, shrubs, parks and backyards around you.
And after dark, step outside for a few minutes and listen.
There may be far more happening in the skies above Charleston than you realize.
Happy Birding!
Charles
Holy City Birding
