The site contains three tracks: the 5.793 km Grand Prix circuit, the 2.405 km Junior track, and a 4.250 km high-speed oval with steep bankings that fell into disuse after 1969 and was restored in the 2010s.
The circuit was financed by the Milan Automobile Club, which created the Società Incremento Automobilismo e Sport (SIAS) to operate it. Construction ran from May to July 1922, carried out by 3,500 workers. The original site covered 3.4 square kilometres and contained a 4.490 km paved oval and a 5.500 km road course that could be combined via a shared front straight into a 10.000 km layout.
The track officially opened on 3 September 1922. The maiden race, the second Italian Grand Prix, was held on 10 September 1922. Monza's proximity to Milan, Italy's economic centre, helped establish it quickly as a major venue for international racing.
In 1928, driver Emilio Materassi crashed into the grandstand during the Italian Grand Prix, killing himself and 27 spectators in what was then the most serious Italian racing accident. The Italian Grand Prix was not held again until 1931 as a result. In 1933, the Monza Grand Prix held on the oval claimed the lives of three drivers — Giuseppe Campari, Baconin Borzacchini, and Stanisław Czaykowski — in what became known as the "Black Day of Monza". A major rebuilding in 1938–39 removed the high-speed ring, added new stands and entrances, resurfaced the track, and established a 6.300 km road circuit layout in use until 1954. Racing was suspended during World War II; the circuit was renovated over two months at the start of 1948 and racing resumed in October of that year.
In 1954 a new 4.250 km high-speed oval with banked sopraelevata curves was constructed, enabling the combined 10 km layout to be reinstated. The Automobile Club of Italy used the oval for the Race of Two Worlds competitions in 1957 and 1958, pitting USAC IndyCars against European Formula One and sports cars. American cars dominated both events. In 1957 Jimmy Bryan won two heats and Troy Ruttman the third; in 1958 Jim Rathmann won all three races.
Formula One used the combined 10 km circuit in the 1955, 1956, 1960, and 1961 Grands Prix. Stirling Moss and Phil Hill each won twice during this period; Hill's victory made him the first American to win a Formula One race. The 1961 race ended the oval era: a collision between Wolfgang von Trips and Jim Clark sent von Trips' car airborne into the barriers near the Parabolica, killing von Trips and 15 spectators. Formula One did not use the oval again. A final attempt with the combined circuit for the 1963 race failed when the extremely bumpy banking caused mechanical failures, and teams threatened to withdraw unless the layout reverted to the road course alone. The oval held its last major race at the 1969 1000 km of Monza, having previously been used for banked record-breaking runs until the late 1960s. The decaying banking survived demolition in the 1990s and was restored in the 2010s.
The circuit has been continuously modified to improve safety and reduce speeds. In 1972, two chicanes were introduced — the Variante del Rettifilo on the main straight and the Variante Ascari — reducing the lap to 5.755 km. Motorcycle racing continued on the unslowed road course until a 1973 mass crash at Curva Grande killed Renzo Pasolini and Jarno Saarinen; motorcycling did not return until 1981. The 1972 chicanes were progressively reworked: the Vialone was rebuilt in 1974, the Curva Grande in 1976, and a third chicane was also added in 1976 before the Lesmo.
Following the deaths of Ayrton Senna and Roland Ratzenberger at Imola in 1994, Monza's three main long curves were "squeezed" to allow larger gravel traps, shortening the lap to 5.770 km. In 1997 the stands were reworked to expand capacity to 51,000. In 2000 the first chicane was reprofiled from a double left-right to a single right-left configuration to reduce accidents at race starts. A fire marshal, Paolo Gislimberti, was killed by flying debris at the second chicane during that year's Italian Grand Prix; in 2007 the gravel run-off at that chicane was replaced with asphalt. The track was resurfaced in full ahead of the 2024 Italian Grand Prix.
Monza is generally flat, with only a gradual gradient from the second Lesmos to the Variante Ascari. Formula One cars run at full throttle for nearly 80% of the lap. Engines are at high stress throughout; notable failures in the corpus include those of Fernando Alonso at the 2006 Italian Grand Prix and Nico Rosberg at the 2015 Italian Grand Prix. Cars are set up with minimal wing angles to reduce drag on the long straights.
Approaching the first chicane, the Variante del Rettifilo, cars arrive at 340 km/h in eighth gear and brake approximately 120 m before entry. The Curva Grande that follows is typically taken flat-out. The two Curve di Lesmo are entered at around 273–278 km/h; the first is blind with slight banking, and the second requires full use of the kerb. The Variante Ascari is described as a tricky sequence key to lap time. The final corner, the Curva Alboreto (formerly Curva Parabolica), is approached at 335 km/h in eighth gear, with cars exiting at 285 km/h onto the main straight.
The maximum speed recorded by a 2025 Formula One car was 364.1 km/h at the end of the start/finish straight. Cars experience a maximum deceleration force of 4.50 g.
Max Verstappen recorded the fastest pole position lap at Monza during the 2025 Italian Grand Prix in 1:18.792 at an average speed of 264.681 km/h (164.465 mph), the fastest average qualifying lap speed in World Championship history. The official race lap record is 1:20.901, set by Lando Norris at the same event at an average speed of 257.781 km/h (160.178 mph), the fastest average race lap speed in World Championship history.
Monza has claimed the lives of 52 drivers and 35 spectators. Among those killed in crashes at the circuit: Fritz Kuhn (1922, practice for the Italian Grand Prix); Emilio Materassi and 27 spectators (1928, Italian Grand Prix); Ugo Sivocci (1923), Count Louis Zborowski (1924), Luigi Arcangeli (1931), Giuseppe Campari, Baconin Borzacchini, and Stanisław Czaykowski (1933); Rupert Hollaus (1954, motorcycle Grand Prix practice); Alberto Ascari (1955, private testing at the Vialone curve, driving a Ferrari 750 Monza, four days after his harbour crash in the Monaco Grand Prix); Wolfgang von Trips and 14 spectators (1961); Jochen Rindt (1970, practice, at the Parabolica); Renzo Pasolini and Jarno Saarinen (1973, motorcycle race); Ronnie Peterson (1978, died in hospital after a start-line crash at the Italian Grand Prix); Paolo Gislimberti, a fire marshal (2000, debris at the Roggia chicane).
Current events at Monza include the Formula One Italian Grand Prix, FIA Formula 2 and Formula 3 championship rounds, the GT World Challenge Europe, the International GT Open, and the Euroformula Open Championship, along with various national series including the Italian GT Championship, TCR Italian Series, Italian F4 Championship, Porsche Carrera Cup Italia, and Lamborghini Super Trofeo.
Former events include the Race of Two Worlds (1957–1958), the 1,000 km Monza endurance race as part of the World Sportscar Championship, rounds of the Superbike World Championship, the World Touring Car Championship, and the final round of the 2020 World Rally Championship (ACI Rally Monza). Non-motorsport events include the Nike Breaking2 project, in which Eliud Kipchoge ran 2:00:25.
This article is based solely on the supplied corpus. No external sources were consulted; claims that could not be substantiated against the corpus were omitted under the drop-the-claim rule.
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