When Will You See Maple ‘Copters Flying?
Maple seeds have been swirling everywhere this spring. Find out what it means and the science behind their flight!
Quick Reference: Maple Copters (Samaras)
- Real name: samara, a winged single-seed fruit. Also seen on ash, elm, ailanthus, and hop hornbeam.
- Why they spin: the wing widens away from the seed; air over the wide end moves faster, generating lift, like a tiny helicopter rotor.
- Tiny tornadoes: in wind-tunnel tests, samaras form a leading-edge vortex that adds extra lift. Hummingbirds and insects use the same trick.
- A bumper year: a tree that drops a heavy crop is often responding to stress from the previous season, drought, late frost, or heavy pruning.
- When you’ll see them: silver maple late spring; red maple late spring/early summer (and again in fall); sugar maple early summer into autumn.
- Why we care: NASA and university aerodynamicists are copying samara geometry for Mars rotorcraft and palm-sized drones.
Helicopters, maple copters, whirlybirds, twisters, whirligigs, no matter what you call a maple seed, they are still an endless source of fascination. Many Farmers’ Almanac readers and Facebook fans have been asking about the large number of “helicopters” they have been seeing, and whether it means anything. The short answer: yes, sometimes. The long answer is half botany, half aerodynamics, and a little bit of weather memory from the tree itself (a primer at the Britannica entry on maple trees covers the genus background).
What Are Maple Copters, Anyway?
First, the technical term for this winged seed is samara, which refers to a specialized fruit designed to travel long distances from the parent tree. Some ash and elm trees also produce samaras, although the maple’s samaras are the very best at flying.
Healthy maple trees sometimes skip a year in seed formation, either due to poor pollination or to an exceptionally good growing season the year before. An over-abundance of samaras sometimes means the tree experienced some sort of “stress” the previous year, so producing a bumper crop of seeds is the tree’s way of carrying on the species, in case that stress continues and that particular tree does not survive. Foresters call this “masting,” the same phenomenon you see in oaks with acorn years.
Why Do Maple Seeds Fly?
Among trees, maples have some of the largest, widest canopies. That means for a seedling to grow, the seed cannot simply fall to the ground beneath the tree like a nut or a fruit. Since only a few animals eat the seeds, mostly turkeys, finches, and on rare occasions squirrels and chipmunks, there is very little chance that wildlife will pick them up and carry them elsewhere. To get around these obstacles, maples developed winged samaras as a way to transport their fruit to sunnier, more hospitable places.
A Natural Lesson in Aerodynamics
Maple seeds are one of those natural wonders that feature a nearly perfect design. Scientists are using what they are learning from these flying seeds to develop micro flying machines and even tiny helicopters that can be used for space exploration or to learn more about the atmospheres of planets like Mars. NASA’s Ingenuity helicopter, which logged dozens of flights at Mars in 2021 to 2024, has a successor concept that borrows samara-style geometry for thinner Martian air.
It all starts with the shape. With a long wing that balances the weight of the seed, maple seeds are designed for flight. Since the seeds do not fall away from the tree until they are dry, they are very light, which helps them travel farther.
If you examine a maple seed closely, you will notice that the wing gets wider further away from the seed. When the seed spins, the air moving over the wide end of the wing moves faster than the air closer to the seed, which gives the seed the lift it needs to stay aloft. Then there are the veins on the leading edge of the wing, which generate just enough turbulence to help it cut through the air.
Tiny Tornadoes
Those are the basic ideas behind flying maple seeds, but when scientists dug a little deeper into the aerodynamics, they found something interesting. While observing the seeds in a smoke-filled wind tunnel, researchers noticed that they actually form a small vortex, like a tiny tornado, atop the wings. That vortex lowers the pressure above the seed, generating even more lift. Insects and hummingbirds rely on the same kind of vortex to hover in one spot. A 2009 study published in Science by David Lentink at Wageningen University quantified the leading-edge vortex on maple samaras and made it official.
Wings Aren’t Just for Flight
The wings give maple seeds another big advantage. Once a maple seed lands, the wing helps it stand upright between blades of grass or other foliage. The upright seeds have a better chance of embedding themselves into the soil below. Once pressed into the soil, whether by a passing foot, the weight of snow, or something else, the wings break away so that the seed can germinate more easily.
When Will The ‘Copters Fly?
It depends on what kind of maple tree you have, and each is on its own schedule.
Silver maple: late spring (typically May).
Red maple: in late spring or early summer, and a smaller second drop in fall.
Sugar maple: the samaras have 1-inch wings that ripen from early summer into autumn. About two weeks after samaras mature, sugar maples drop them.
Maple Copter Calendar at a Glance
| Maple species | Typical drop window | Wing length | Spin style |
|---|---|---|---|
| Silver maple (Acer saccharinum) | May to early June | 1.5 to 2 inches | Large, slow, late-spring flurry |
| Red maple (Acer rubrum) | Late May to June, smaller fall drop | 0.75 inch | Tight, fast spin |
| Sugar maple (Acer saccharum) | August to October | 1 inch | Steady, glide-then-spin |
| Norway maple (Acer platanoides) | September to October | 1.5 inches, wide angle | Wide-spread “V” pair |
| Box elder (Acer negundo) | Fall, often holding into winter | 1 inch | Persistent, often clusters |
A bumper samara year often follows a drought year
Yard watering and seasonal rainfall, planned together.
A stressed maple drops a heavier crop the next year. The Farmers’ Almanac extended forecast helps you spot dry stretches before your trees do.
Maple Copters FAQ
What is the proper name for a maple copter?
A samara: a single-seeded winged fruit. Ash, elm, ailanthus, and hop hornbeam also produce samaras, but maples make the showiest, longest-traveling versions.
Does a heavy maple seed year mean a hard winter?
No. The folklore links acorn and samara abundance to a coming winter, but the science says the opposite direction in time: a heavy crop looks backward at the previous season’s stress (drought, late frost), not forward at the next winter.
Why do maple seeds spin?
The wing widens away from the seed, so the outer edge moves through air faster than the inner edge. That speed difference generates lift, the same way a helicopter rotor does. A leading-edge vortex along the wing adds another boost.
Are maple seeds safe to eat?
For humans, yes, in small amounts. Foragers strip the wings and either eat the seed raw or roast it. Bitter samaras (silver maple, mostly) are best soaked first. For dogs, however, red maple and some related samaras are toxic to horses, and large amounts can upset dogs. Keep that in mind around pets.
When do maple copters fly?
Silver maple drops in late spring. Red maple drops in late spring and again in fall. Sugar and Norway maples drop from late summer into October. Box elder holds samaras into winter.
Should I rake samaras off my lawn?
Yes, if you do not want a lawn full of seedlings next year. A thick samara blanket can also smother grass. A mulching mower handles light coverage. Heavy drops need a leaf rake or a leaf blower set on vacuum.
Can I grow a maple from a samara?
Yes. Most species need a cold stratification period (12 weeks in a damp bag in the fridge) before they will sprout. Plant them about a half inch deep in a pot of seed-starting mix once spring soil hits 50°F.
Now that you know more about the maple’s flying seeds, you will be even more fascinated by the hundreds of them you see swirling toward the ground each year. For more on the maple genus, read our companion pieces: backyard maple sugaring, maple syrup facts, and why leaves change color in fall.
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Amber Kanuckel
Amber Kanuckel is a freelance writer from rural Ohio who loves all things outdoors. She specializes in home, garden, environmental, and green living topics.
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We have a Maple tree that had helicopters in the spring. However, this fall we had dark helicopters in October. This was the first time since we have lived here since 2005. I am waiting to see what our winter will be like. I feel that this was done for the animals to have extra food during a bad winter. I have found nothing in any books that prove this yet. So I will see.
I’m trying to find out if this is a mast year for Norway Maples. This is the first time in 30 years that our Norway Maple has had “noses” still hanging on and dropping in January! They are EVERYWHERE and there are so many. It seems to be only Norway Maples. Our Sugar Maple has no seeds at all.
What month specifically in the fall do the seeds drop? We have a couple sugar maples but its almost the middle of October and I haven’t seen a single seed from them. They are also very green still. I’m worried they are diseased.
Hi Kat, it depends on the tree variety. Some don’t drop until fall, others drop in the spring.
Are maple trees the only one that have these
We have two maples in the backyard of the house we just moved into and they are both losing whirlybirds but one in particular is dumping tons of them. Quite the mess but I’m glad to find out it’s normal for this time of year.
Our neighbors have a 200 year old maple. It is majestic. Every 3-4 years we get the dumping of the keys. We have a pool and try to coordinate opening with the tree.
We have had layers deep from the tree. Last year we were lucky with the wind. It went the other way.
This is life and nature… what can we do but enjoy it! ( and skim and vacuum).❤️
Thanks for sharing, Chuck. We agree!
Send me some of the seeds !!!
We have lived in our house for 23 years and I have NEVER seen so many helicopters on my lawn and garden! What a mess. Ours is a silver maple.
This year the “polynoses” are smal l, abundant, dry and pale yellow. Any significance?
Mine are as well..I actually thought the tree might be dying until I googled it and found that many maples are doing that this year! What a mess on the lawn tho.
I also hate the whirlybirds, my neighbor has two giant silver maple trees in their backyard, the builder gave one to each new home, we got rid of ours and never planted it. But now 35 years later we get the blunt of all the mess that comes with the whirlybirds, our flower garden has to be weeded once the wings take root, they are all over our yard, deck and the gutters are full. Very messy trees, not to be planted in a neighborhood!
Agree! My neighbor also has 2 growing 15 ft from my house. What a mess every year. If it’s not the whirlybirds it’s the leaves in the fall. And the wind blows towards me so her mess lands in my yard, on my $ 600 worth of rubber mulch,
in my garage and along the fence line killing all the grass and in my gutters.. These trees have no business being planted in neighborhoods. And people who have these trees should cut them down and replace them with a more appropriate tree for the yard.
Maple trees support many insects and birds. Instead of cutting them down, we should be adapting the other plantings in the yard to be more environmentally friendly. We have a maple tree near our pool, we simply wait until after the seeds are shed to take the cover off and open it.
I hate whirlybirds! I have spent countless hours picking them out of my flower beds! And, then cutting out miniature maple trees growing where other plants are located! They are a nuisance in Iowa!
No tree is a nusience
So I came here by looking around for an answer to a question I have. The helicopters started dropping 2 days ago. They got all in my flower bed since. I went to put a fresh layer of dirt in my flower bed but I left the helicopters in the bed and put dirt over them.
Do I have to worry that these hundreds of maple seeds will sprout? I really didn’t think much of it because my wife pointed out that if they were seeds we would have maples growing everywhere but now seeing this maybe putting dirt over them was a bad idea?
Yes, you will have tiny maples in your landscape. Although I doubt more than normal as squirrel and chipmunk love to plant them for you even if you do nothing.