Benjamin Franklin’s Kite Experiment: What Do We Know?

On June 10, 1752, Benjamin Franklin is said to have flown a kite during a thunderstorm with a key tied to the string, drawing an electrical charge from the clouds. Or so the legend goes. The truth is far more complicated—and far more revealing about how scientific knowledge actually advances. Historians remain uncertain about the exact date of the experiment, and some scholars have questioned whether it took place at all. What we do know is that this experiment, whatever its precise circumstances, formed part of a broader colonial-era intellectual world in which natural philosophy, political ambition, and cross-cultural exchange between European settlers and Indigenous nations shaped the foundations of the American republic.

The Historical Origins of Franklin’s Lightning Research

Electricity was already a well-known phenomenon by the mid-18th century. European philosophers had been experimenting with static electricity, Leyden jars, and electrical discharge for decades. What remained contested was the nature of lightning itself. Franklin was one of a group of natural philosophers who theorized that lightning was simply a dramatic form of electrical discharge—a theory that, if proven, carried enormous practical implications for protecting buildings and ships from fire.

In March 1750, Franklin wrote to his friend Peter Collinson outlining his concept for a lightning rod. That July, he published a proposal for an experiment using an elevated rod to capture electrical charge in a Leyden jar, thereby demonstrating that lightning was electricity. Franklin’s ideas circulated widely in Europe. By May 1752, two French scientists—Thomas Dalibard and M. Delor—had independently carried out successful versions of Franklin’s proposed experiment. Priestley later recorded that Franklin had not yet learned of these French successes when he supposedly conducted his own kite experiment.

The Documentary Record: A Letter and a Biography

Everything historians know about the kite and key experiment derives from two primary sources. The first is a letter Franklin wrote to Collinson in October 1752, published in The Pennsylvania Gazette and read before the Royal Society. In it, Franklin stated that an “Experiment has succeeded in Philadelphia” using a kite and key, and described how one might reproduce it—but he never specified the date or explicitly confirmed that he himself had performed it.

The second source is a section of Joseph Priestley’s 1767 book History and Present Status of Electricity, in which Priestley recounted what Franklin had presumably told him. Priestley wrote that 46-year-old Franklin and his 22-year-old son William conducted the experiment sometime in June 1752. The detail about the shed, the secrecy, and the son’s assistance all come from this single, secondhand account.

What the Experiment Actually Looked Like

Popular illustrations of Franklin standing boldly in an open field during a thunderstorm are historically inaccurate. According to Harold D. Wallace Jr., curator in the division of work and industry at the Smithsonian National Museum of American History, “most of the pictures and drawings that you see depicting Franklin in this experiment are inaccurate.” He notes that Franklin and William were most likely inside some kind of shed or lean-to to keep dry, and that Franklin probably began the experiment after sensing atmospheric electricity but before rain began to fall.

Franklin’s goal was never to be struck by lightning. Had that occurred, he would almost certainly have been killed or seriously injured. In 1753, the German scientist Georg Wilhelm Reichmann died while attempting Franklin’s lightning rod experiment—proof of the very real danger involved. What most likely happened is that the key accumulated ambient electrical charge from the storm’s atmosphere, and Franklin felt the charge when he touched it, confirming that lightning was indeed electrical in nature.

It is worth noting that Indigenous nations of the Northeast had long observed the natural world with profound sophistication, and the colonial scientific community often benefited from knowledge systems that predated European settlement. For broader context on how Indigenous innovation shaped early America, see 8 Incredible Inventions of the Indigenous People of the Americas.

The Lightning Rod and Its Revolutionary Impact

Whether or not the kite experiment occurred exactly as legend describes, Franklin’s lightning rod concept was tested and validated by others. Together, these experiments demonstrated that lightning was a form of electricity that could be harnessed—both to protect tall structures from fire and to enable further electrical research.

“The idea of mitigating natural dangers is such a big game changer,” says Michael Madeja, head of education programs at the American Philosophical Society Library and Museum. “The lightning rod also helped provide a decent source of charge for things like Leyden jars or other electrical experiments.”

This breakthrough positioned Franklin as one of the most celebrated scientific minds of the colonial era. His reputation as a natural philosopher was inseparable from his political career, which placed him at the center of the American Revolution. For a fuller picture of Franklin’s revolutionary contributions, see Benjamin Franklin Biography, Inventions & Facts.

Colonial Science in a Contested Continent

Franklin’s experiments took place in a North America that was very much a contested space between European empires and sovereign Indigenous nations. The French and Indian War would erupt just two years after the kite experiment, fundamentally reshaping the balance of power across the continent. Indigenous nations were not passive observers of colonial science and politics—they were central actors whose diplomacy, military alliances, and territorial sovereignty determined the fate of European settlements.

Understanding Franklin’s scientific work therefore requires understanding the broader colonial context: a world where European intellectual ambition coexisted with—and often depended upon—relationships with Native nations whose knowledge of land, weather, and natural cycles was far older and more sophisticated than anything brought from Europe.

Historical Context & Key Cultural Takeaways

• Electricity was not discovered by Franklin. It was already a known phenomenon; Franklin’s contribution was theorizing and demonstrating that lightning specifically was a form of electricity.
• The kite experiment’s date is uncertain. Scholars speculate around June 10, 1752, but no definitive record exists, and some historians doubt it occurred as described.
• The lightning strike myth is dangerously false. A direct strike would have killed Franklin; the key likely only collected ambient electrical charge.
• Only two primary sources document the event: Franklin’s October 1752 letter to Collinson and Priestley’s 1767 biography.
• The lightning rod was the real breakthrough. Its practical applications for protecting buildings made it one of the most consequential inventions of the 18th century.
• Colonial science existed within a contested Indigenous landscape. Native nations shaped the political and territorial realities in which all colonial intellectual work took place.

Frequently Asked Questions

Did Benjamin Franklin actually fly a kite in a thunderstorm?

Historians cannot definitively confirm it. The only documentary evidence comes from Franklin’s own October 1752 letter—which never explicitly says he performed the experiment himself—and Joseph Priestley’s 1767 account, which states that Franklin and his son William conducted it in June 1752. Some scholars accept the account; others express doubt.

Was Franklin struck by lightning during the experiment?

No. If lightning had struck the key directly, Franklin would almost certainly have been killed. In 1753, German scientist Georg Wilhelm Reichmann died conducting Franklin’s lightning rod experiment, demonstrating the lethal danger involved. Franklin’s key most likely collected only ambient electrical charge from the storm.

Did Franklin discover electricity?

No. Electricity was already a known phenomenon in the mid-18th century. Franklin’s contribution was theorizing that lightning was a form of electricity and proposing a method for demonstrating it. Even this was tested first by French scientists Thomas Dalibard and M. Delor in May 1752.

What was the real legacy of Franklin’s experiment?

The lightning rod. Franklin’s research led directly to a practical device that protected buildings from lightning strikes, making it one of the most important technological innovations of the 18th century.

How does this connect to Native American history?

Franklin’s experiments occurred in a colonial North America shaped by ongoing diplomatic and military relationships with sovereign Indigenous nations. Two years after the supposed kite experiment, the French and Indian War would transform the continent—with Native nations playing decisive roles. Understanding colonial science requires understanding this broader Indigenous context.

Concluding Synthesis on Cultural Legacy & Modern Preservation

The story of Franklin’s kite experiment is a case study in how historical legends form and evolve. What began as a scientifically ambitious hypothesis became, through repetition and artistic imagination, a dramatic myth involving a lightning strike that almost certainly never occurred. Yet the underlying achievement remains real: Franklin helped prove that lightning was electricity, and the lightning rod he inspired transformed how humanity protected itself from one of nature’s most feared forces.

Professional historians, museum curators, and archivists continue to preserve the documentary record that allows us to separate fact from legend. Institutions such as the Smithsonian National Museum of American History and the American Philosophical Society hold artifacts and papers that make this critical reassessment possible. Understanding Franklin accurately—neither as a lone genius who “discovered” electricity nor as a mythic figure untouched by doubt—requires engaging with the evidence as it actually exists: fragmentary, ambiguous, and deeply human.

This commitment to factual accuracy extends to how we understand all of early American history, including the complicated relationships between colonial figures and the Indigenous nations whose lands they inhabited. Honest history holds both the brilliance and the ambiguities side by side.