Last updated: August 21, 2026
This is the single most repeated piece of hummingbird advice in North America, and it has been wrong the whole time. Take the feeder down by a certain date, the story goes, or the birds will hang around drinking free sugar water until the cold catches them out. It sounds responsible. It is why thousands of feeders come down every September.
Both Audubon and the Cornell Lab of Ornithology address the claim directly, and both say the opposite of what your neighbor told you. Below is what each one actually publishes, what really sets the departure date, and what to do with the feeder in September instead.
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Quick Answer
Do feeders keep hummingbirds from migrating?
- No. Audubon says hummingbirds are genetically programmed to head south in fall.
- What tells them to go is changing day length and the angle of the sun, not the nectar supply.
- The Cornell Lab says they migrate regardless of whether feeders are up.
- Both encourage leaving feeders up for late birds that still need to refuel.
Bottom line: your feeder is a fuel stop on a journey that was already scheduled.
What Audubon and Cornell Actually Say
Audubon answers the question with a flat no, explaining that hummingbirds are migratory and genetically programmed to head south in the fall, and that it is not a lack of nectar or colder weather that makes them leave. They know it is time from changes in the length of the day and the angle of the sun.
The Cornell Lab lands in the same place, noting that hummingbirds migrate regardless of whether feeders are up, and encouraging people to keep feeders going for several weeks after the last bird in case a straggler needs energy for the trip. Two sources, one answer.
What Actually Triggers Departure
Day length, which is the one seasonal signal that does not lie. Temperature swings wildly from year to year and flowers vary by yard, but the length of a September day is identical every September, and that is the cue Audubon points to alongside the angle of the sun.
This is why a warm autumn does not produce a yard full of stranded hummingbirds. The internal calendar is already running, and a full feeder does not reset it any more than a mild week does.
Why the Myth Made Sense
Because it maps onto how we think about pets, and because the timing is suggestive. Feeder traffic drops off sharply just as people start worrying about the first frost, so the story of the trapped bird arrives at exactly the moment it feels most plausible.
The Late Bird Everyone Remembers
There is usually one, hanging around weeks after the rest have gone, and it looks like proof. It is more likely a bird from further north still working its way through, or a late fledged youngster, which is precisely the situation the Cornell Lab has in mind when it suggests leaving feeders up.
What Leaving It Up Does Do
It gives late travelers a reliable stop in a yard where the flowers have already finished. That is a modest, real benefit rather than a dramatic one, and it costs you a few more weeks of the same routine you kept all summer.
Cooler weather also loosens the cleaning schedule. Audubon’s interval for cooler weather is twice per week, against every day or every other day in the heat, so a September feeder is less work than a July one. Our piece on how often to change nectar has the full schedule.
The Claim Against the Sources
The table sets each version of the worry beside what the two organizations publish.
| The worry | What the sources say | What is really happening | What to do |
|---|---|---|---|
| Feeders delay migration | Audubon: no, they are genetically programmed to head south | Day length and sun angle set the timing | Leave the feeder up |
| A late bird is trapped | Cornell Lab: keep feeders up for stragglers | Usually a bird from further north passing through | Keep nectar fresh for it |
| Removing it forces them out | Cornell Lab: they migrate regardless | You remove a fuel stop, not a reason to stay | Do not use removal as a nudge |
| Cold will catch them out | Audubon: colder weather is not what makes them leave | The internal calendar is already running | Bring the feeder in overnight if it freezes |
Sources for the second column are Audubon’s hummingbird feeding guidance and the Cornell Lab of Ornithology’s answer on feeding birds in fall.
What to Do in September Instead
Keep the feeder going, mix smaller batches as traffic drops, and stop when several weeks have gone by with nothing. That is the whole autumn plan, and it replaces a calendar deadline with the only signal that is actually about your yard.
If you would rather have the seasonal detail in one place, we cover the fall wind down in when to take feeders down, and the spring version of the same question in when to put them out.
The Winter Exception on the Pacific Coast
Not everyone has a fall departure to think about. Cornell Lab’s All About Birds describes Anna’s Hummingbird as a year round resident along the Pacific Coast, so in that part of the country the feeder simply keeps running and the winter problem is freezing rather than migration.
Elsewhere, an unusual winter bird is worth reporting to a local Audubon chapter or your state wildlife agency rather than worrying about. They will know whether it is remarkable, and they are the right people to ask.
Frequently Asked Questions
Will leaving my feeder up stop hummingbirds from migrating? No. Audubon says hummingbirds are genetically programmed to head south in the fall and that changes in day length and the angle of the sun tell them when to go. The Cornell Lab says they migrate regardless of whether feeders are up.
Is there a date I must take the feeder down by? Neither source gives one. Audubon says you can leave feeders out as long as you have hummingbirds around, and the Cornell Lab encourages keeping them up for several weeks after the last sighting.
Why is there still one hummingbird at my feeder in October? Most often a bird from further north moving through, or a late youngster. That is exactly the traveler the Cornell Lab has in mind when it suggests keeping feeders up for stragglers.
Does taking the feeder down make them leave sooner? No. You remove a fuel stop, not a reason to stay. The departure timing is set by day length rather than by what is in your yard.
Should I feed a hummingbird that stays through a cold snap? Keep the feeder available and bring it in overnight if the nectar freezes, then put it back at first light. If the bird is present unusually late for your area, contact a local Audubon chapter or your state wildlife agency.
Do the same rules apply to orioles? The migration principle is not a hummingbird quirk, but the feeding side is different, since orioles take jelly, fruit and a more diluted nectar. See our oriole feeder guide for that setup.
The Bottom Line
Feeders do not delay migration. Audubon calls the departure genetically programmed and points to day length and the angle of the sun, and the Cornell Lab says hummingbirds migrate whether or not feeders are up. Leave yours out, keep the nectar fresh, and give late travelers somewhere to refuel. Read next: our hummingbird feeder guide for the hardware, and when to take feeders down for the practical wind down.