Every night of San Fermín, a bull made of fire chases children through the streets of Pamplona’s old town. Except it is not a bull. The toro de fuego is a wooden frame in the shape of a bull, loaded with fireworks and carried on the shoulders of a runner, and the version most English guides describe, a 10 p.m. run down the encierro route toward Calle Estafeta, no longer matches what the city actually schedules. The current San Fermín program, published by the festival itself, runs the toro de fuego at 21:45 along Cuesta de Santo Domingo, the Plaza Consistorial and Calle Nueva.
Getting this wrong costs visitors twice. Families who show up on Estafeta at 10 p.m. expecting the fire bull are standing on the wrong street at the wrong time. And readers who assume the event involves a live animal, the way the toro embolado of eastern Spain does, either avoid one of the festival’s most beloved children’s traditions for no reason or arrive with entirely wrong expectations about what they will see.
What follows is based on the festival’s own published program at sanfermin.com, the Basque academic encyclopedia Auñamendi and Euskaltzaindia’s dictionary of the Basque language for the tradition’s name and definition, the Spanish pyrotechnics association AEPIRO for how the device actually works, and Spanish press coverage of the wider fire bull tradition across the north.
What the Zezensuzko Actually Is
In Basque the tradition is called zezensuzko, also written suzko zezena, literally the fire bull. The Spanish name, toro de fuego, is the one printed in the festival program. Euskaltzaindia’s Orotariko Euskal Hiztegia, the reference dictionary of the Basque language, defines it as a bull shaped pyrotechnic device carried by a person, used at night during festivities across the Basque cultural region, charging at the crowd to make people run while dodging the sparks.
The physical object is simpler than the spectacle suggests. A frame of wood and cardboard, built in the silhouette of a bull with a head and horns, a profile Spaniards also know from the Toro de Osborne billboards along the country’s roads, carries racks of fireworks on its back: fountains that throw jets of colored sparks, firecrackers, and pieces that spin and whistle. A single carrier hoists the whole thing onto his shoulders and runs at the crowd until the charge burns out. Navarra’s own hospitality association puts the weight at over thirty kilos, which is why the traditional format uses a relay: a rocket announces the first bull, and partway through the run a second carrier takes over with a fresh charge. Two bulls, roughly half an hour of running, every single night of the fiesta.
The fireworks themselves are what the pyrotechnics trade calls cold fire. The sparks can singe a shirt, and every year plenty of shirts get singed, but the composition is designed not to burn skin. The one firm rule the local guidance repeats is not to touch the bull or jump on it. There is a person under that frame carrying thirty kilos of burning pyrotechnics, and he cannot see or brace for anyone who grabs it.
Where and When to See It
The 2026 San Fermín program lists the toro de fuego at 21:45 every night of the festival, with the route given as Cuesta de Santo Domingo, Plaza Consistorial and Calle Nueva. That is worth reading twice, because it is not the description most English coverage repeats.
The older, widely copied description has the fire bull leaving from the Plaza de Santiago behind the Ayuntamiento at 10 p.m. and following the morning encierro’s path to the middle of Calle Estafeta, where the relay happened, with the second bull continuing to the Telefónica stretch. That routing appears in older Spanish materials and it is how many Pamplona regulars remember the event. The current program keeps the start on the encierro’s opening stretch, Cuesta de Santo Domingo and the Plaza Consistorial, then turns down Calle Nueva instead of continuing toward Estafeta. If you are planning an evening around it, trust the year’s program as the festival publishes it over any guide, including this one, because the city adjusts times and routes and the program at sanfermin.com is the only document that counts.
For families, the toro de fuego is the second half of a children’s double feature. The morning belongs to the cardboard bulls of the Encierro Txiki and the parade of the Gigantes; the night belongs to the fire bull. Kids in Pamplona grow up running in front of the zezensuzko with their parents a few steps behind, and the crowd is overwhelmingly local. It is loud, it smells of gunpowder, and small children who dislike fireworks will dislike this too. Children who love fireworks tend to remember it for the rest of their lives.
Four Centuries of the Fire Bull, Including the Version Nobody Would Stage Today
The first mentions of a fire bull in Pamplona appear in seventeenth century chronicles of the fiesta’s taurine events. The Auñamendi encyclopedia, the standard Basque reference work, places the earliest references to the tradition in that century at the Sanfermines themselves, which makes Pamplona not a town that adopted the fire bull but one of the places the record starts.
The original version used a live animal. Young men loaded fireworks onto the back of a real bull and set them off. The practice was eventually abandoned for its obvious cruelty and replaced with the carried frame, which kept the spectacle and removed the animal. That substitution is the entire modern event: the toro de fuego of today’s San Fermín has no animal in it and never touches one.
There is also a much older story that pyrotechnics people like to tell about where the idea comes from. In 228 BC, at a battle near Helike, the Iberian leader Orisson is said to have sent cattle with burning straw lashed to their horns against the Carthaginian army of Hamilcar Barca, panicking the enemy’s elephants and breaking their lines. The Spanish pyrotechnics association AEPIRO passes the story along with the caution that only some sources trace the tradition back that far. It is a legend with a good pedigree rather than documented origin, and it should be enjoyed exactly at that level.
The Distinction English Coverage Misses: Toro de Fuego Is Not Toro Embolado
Spain has a second, entirely different fire bull tradition, and conflating the two is the most consequential mistake a visitor can make. The toro embolado, typical of towns in the Valencian Community and southern Catalonia, uses a live bull with flammable material fixed to a frame on its horns, set loose in the streets at night. It is a real animal event, it is controversial inside Spain, and it has nothing to do with what happens in Pamplona.
Scholars of Spain’s taurine games note that the carried frame version may well have originated specifically to replace the live animal version. Whatever the exact lineage, the two events sit at opposite ends of a spectrum: one is a person in a fireworks costume chasing delighted children, the other is a live bull. When an English article about San Fermín describes the toro de fuego with a photograph or phrasing borrowed from toro embolado coverage, it is describing an event that does not exist in Pamplona. The festival’s taurine program is the morning encierro and the events in the bullring; the fire bull is a children’s pyrotechnic show and always involves a frame, not an animal.
Pamplona Is Not Alone: The Fire Bull Across the North
The zezensuzko runs across the whole Basque festive calendar and far beyond it. San Sebastián’s Semana Grande stages a nightly fire bull run so established that El País counted more than thirty bulls in some editions, each throwing about a meter and a half of sparks. Bilbao’s Aste Nagusia includes it, as does Vitoria’s own Semana Grande, and AEPIRO documents the tradition in fiestas across La Rioja, Aragón, both Castillas, Madrid, Asturias and Andalucía. Across the Atlantic the same idea appears as the vaca loca or toro candil of Ecuador, Paraguay, Peru and Mexico, a reminder of how far Spanish fiesta culture traveled.
Within that map, Pamplona’s version stands out for two reasons. It is among the earliest documented, with those seventeenth century references at the Sanfermines. And it is unusually embedded in a daily rhythm: for nine consecutive nights the fire bull runs at the same hour on the same streets, as fixed a part of the schedule as the 8 a.m. encierro it playfully mirrors. Most towns get their toro de fuego once a year at the patron saint’s fiesta. Pamplona’s children get it every night for a week and a half.
FAQ
What time is the toro de fuego in Pamplona?
The San Fermín program schedules the toro de fuego at 21:45 every night of the festival, July 6 through 14. The listed route is Cuesta de Santo Domingo, Plaza Consistorial and Calle Nueva. Check the current year’s program at sanfermin.com before you go, because the city sets the definitive time and route each year.
Is the toro de fuego a real bull?
No. It is a frame of wood and cardboard shaped like a bull, loaded with fireworks and carried on the shoulders of a runner. Pamplona’s event has used the carried frame since the live animal version documented in the seventeenth century was abandoned for its cruelty. It should not be confused with the toro embolado of eastern Spain, which does use a live bull and is a completely separate tradition.
Is the toro de fuego safe for children?
It is a fireworks event in a running crowd, so treat it with the same realism as everything else at San Fermín. The pyrotechnics are the cold fire type that does not burn skin, and the characteristic injury is a spark singed shirt rather than anything worse. Keep small children at the edges, do not let anyone touch or grab the frame, and expect noise and gunpowder smoke. Local families run in front of it with young kids every night.
What does zezensuzko mean?
Zezensuzko is the Basque name for the fire bull, from zezen, bull, and su, fire. It is also written suzko zezena. In Spanish the same tradition is called the toro de fuego, and that is the name used in the San Fermín program.
Every article on the Encierro blog is authored or reviewed by active bull runners with direct experience in Pamplona.