The veneration of Gerardo began soon after his death: he is called "blessed" in a document of 1230, and "holy" or "saint" in one of 1247.
 After making an investigation, around 1582, Charles Borromeo, Archbishop of Milan, obtaining from Pope Gregory XIII confirmation of the cult of San Gerardo.

Monza has three churches dedicated to him: San Gerardo al Corpo; San Gerardino, also known as San Gerardo Intramurano; and Sancto Gherardo.

Saint Gerardo is invoked especially by sick and pregnant women.
The traditional iconography represents him as an old bearded man, dressed in a tunic, with a staff from which hangs a bunch of cherries and at his feet a basket with bread, wine and eggs, or a bowl with a spoon, symbolizing his attempts to help the poor and the sick.

His liturgical memorial, inscribed in the calendar of Archdiocese of Milan, is 6 June, which is also the anniversary of his death.
On this date, Monza celebrates his feast as the city's patron saint in the church of San Gerardo al Corpo, while at the nearby bridge of San Gerardino a festival takes place which prominently features stalls selling cherries, traditional iconographic attributes of the saint.
A few meters upstream from the bridge, the statue of Saint Gerardo, standing on his cloak, is placed in the river, in memory of the most famous miracle attributed to him.
The veneration of Gerardo began soon after his death: he is called "blessed" in a document of 1230, and "holy" or "saint" in one of 1247.  After making an investigation, around 1582, Charles Borromeo, Archbishop of Milan, obtaining from Pope Gregory XIII confirmation of the cult of San Gerardo.
Monza has three churches dedicated to him: San Gerardo al Corpo; San Gerardino, also known as San Gerardo Intramurano; and Sancto Gherardo.
Saint Gerardo is invoked especially by sick and pregnant women. The traditional iconography represents him as an old bearded man, dressed in a tunic, with a staff from which hangs a bunch of cherries and at his feet a basket with bread, wine and eggs, or a bowl with a spoon, symbolizing his attempts to help the poor and the sick.
His liturgical memorial, inscribed in the calendar of Archdiocese of Milan, is 6 June, which is also the anniversary of his death. On this date, Monza celebrates his feast as the city's patron saint in the church of San Gerardo al Corpo, while at the nearby bridge of San Gerardino a festival takes place which prominently features stalls selling cherries, traditional iconographic attributes of the saint. A few meters upstream from the bridge, the statue of Saint Gerardo, standing on his cloak, is placed in the river, in memory of the most famous miracle attributed to him.
Gerardo dei Tintori