Located inside the wooded hills of Lisbon’s vast Monsanto Forest Park, the Circuito de Monsanto was one of the most unusual street circuits ever used for a Formula One World Championship race.
Built through parkland roads rather than city streets, the track wound its way through forested terrain with steep elevation changes, tight corners and a mixture of road surfaces. The result was a demanding and unpredictable circuit that tested both driver skill and mechanical reliability.
Although it hosted only one Formula One race, the circuit remains a distinctive part of Portugal’s motorsport history.
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Circuito de Monsanto
| First Grand Prix | 1959 Portuguese Grand Prix |
| Number of Laps | 62 |
| Circuit Length | 5.440 km |
| Race Distance | 337.280 km |
| Lap Record | 2:05.07 Stirling Moss (1959) |
Circuit
When was the Circuito de Monsanto built?
The Circuito de Monsanto opened in 1953 in Monsanto Forest Park, a large green area just outside central Lisbon, Portugal.
Unlike purpose-built racing facilities, the track used existing public park roads. These roads twisted through wooded hills, creating a 5.440 km circuit filled with elevation changes and narrow sections.
The layout quickly gained a reputation for being extremely challenging. Drivers had to deal with inconsistent surfaces, tight corners and unusual obstacles, including tramlines crossing the circuit at one point — something almost unheard of in modern racing.
When was the first Portuguese Grand Prix at Circuito de Monsanto?
The circuit hosted its only Formula One World Championship race in 1959, when it staged the Portuguese Grand Prix.
The race was won by Stirling Moss, driving a Cooper T51. In an unusual decision, the race was deliberately started later in the day to avoid the intense Portuguese summer heat, meaning the final laps were run in twilight conditions.
Despite the dramatic setting and enthusiastic crowds, the circuit’s challenging nature meant it was never used again for Formula One.
What made the circuit so difficult?
Monsanto was considered one of the most technically demanding circuits of its time.
Several factors contributed to its reputation:
- Changing road surfaces, which reduced grip consistency
- Tram tracks crossing the circuit, unsettling cars at speed
- Narrow, twisting sections through forest roads
- Elevation changes that made braking and visibility difficult
Combined, these features made the circuit exciting for spectators but very challenging for drivers.
What happened to the circuit?
Although the track hosted races between 1954 and 1959, it gradually fell out of use for major international motorsport.
The circuit officially closed in 1971, and the roads returned fully to normal public use within the park.
Today, the roads still exist within Monsanto Forest Park, but there are few obvious reminders of the former race circuit.
Circuito de Monsanto record lap
The official Formula One race lap record at the circuit is 2:05.07, set by Stirling Moss driving the Cooper T51 during the 1959 Portuguese Grand Prix.
Though its Formula One history lasted just one race, the Circuito de Monsanto remains one of the most distinctive and unusual venues ever to host a Grand Prix.