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The town of Grossio
Comune di Grosio
Grosio is located in Italy
Location of Grosio in Italy
Coordinates: 46°18′N 10°17′E / 46.300°N 10.283°E / 46.300; 10.283Coordinates: 46°18′N 10°17′E / 46.300°N 10.283°E / 46.300; 10.283
Country Italy
Region Lombardy
Province / Metropolitan city Province of Sondrio (SO)
Frazioni Tiolo, Ravoledo
 • Mayor Antonio Pruneri
 • Total 127.0 km2 (49.0 sq mi)
Elevation 656 m (2,152 ft)
Population (Dec. 2004)
 • Total 4,790
 • Density 38/km2 (98/sq mi)
Demonym(s) Grosini
Time zone CET (UTC+1)
 • Summer (DST) CEST (UTC+2)
Postal code 23033
Dialing code 0342

Grosio is a comune (municipality) in the Province of Sondrio in the Italian region Lombardy, located about 130 kilometres (81 mi) northeast of Milan and about 35 kilometres (22 mi) northeast of Sondrio, on the border with Switzerland. As of 31 December 2004, it had a population of 4,790 and an area of 127.0 square kilometres (49.0 sq mi).[1]

The municipality of Grosio contains the frazioni (subdivisions, mainly villages and hamlets) Tiolo and Ravoledo.

Grosio borders the following municipalities: Grosotto, Monno, Poschiavo (Switzerland), Sondalo, Valdidentro, Valdisotto, Vezza d'Oglio.

Culture and Tourism[edit]

Rock Engraving Park-Grosio[2]

Special and unique is the Rupe Magna at the Rock Engraving Park of Grosio. A large rock which has more than 5.000 engraved figures from the 4th to the 1st millennium B.C.[3]

The Rupe Magna is with a length of 84 mts and a width of 35 mts one of the biggest engraved rocks in the Alpine range. Various themes like human figures, including “orants” or armed men, animals, geometrical shapes and cup-marks are incised on its surface.

On the "Dosso dei Castelli" (Castle Hill) even the impressive ruins of two castles can be visited. The Castello Nuovo was built in the 14th century by the family of Visconti. The Castello Vecchio (o San Faustino) was constructed in the 11th century by the Bishops of Como.


In the historic center of Grosio the church of San Giorgio is a beautiful example of a 16th century church. The single-nave church contains a lot of frescoes painted by Cipriano Valorsa, the so called Raphael of Valtellina.

At the west entrance of the village one can find the large parish church of San Giuseppe from the 17th century.

Villa Visconti-Venosta The Villa Visconti-Venosta was the historic summer residence of the family Visconti-Venosta from about 1600 to 1982. When the marchioness Margherita Pallavicino Mossi, widow of Giovanni Visconti-Venosta died, she donated the villa to the comune of Grosio. Nowadays the library of te comune is situated in the basement areas. Since 2017 it is open again as a museum.

Demographic evolution[edit]

Twin towns[edit]

Grosio is twinned town with:


  1. ^ All demographics and other statistics: Italian statistical institute Istat.
  2. ^ "official HP". 
  3. ^ "Petroglyphs in Italian Alps Dated" (PDF). Retrieved 2007-07-10.