Beaucroissant is located some 32 km south by south-east ofBourgoin-Jallieu and 25 km north-west ofGrenoble. Access to the commune is by the D1085 road fromLa Frette in the north-west which passes through the commune just north of the village and continues east toMoirans. The D519 comes fromIzeaux in the west and passes through the commune turning north to join theA48 autoroute at Exit 9 . A railway fromLe Grand-Lemps passes through the commune with a station in the village and continues north-east toRives. Apart from the village there is the hamlet of Le Mollard. Apart from the large urban area of the village and Le Mollard the commune is mainly farmland.[5][6]
The commune is famous for its annual fair which has continued since 1219 due to the pilgrimage of Our Lady of Parménie.[9] The history of the village and the Fair is linked with the Parménie hill that dominates the commune with its 749-metre altitude.
The origin of the Beaucroissant fair dates back to 14 September 1219 when the Saint Laurent lake (above the Bourg d'Oisans) overflowed causing a terrible flood that inundated Grenoble and had many victims. Starting from 14 September 1220, organised by thebishop of Grenoble, survivors commemorated this event with a pilgrimage to Parménie. They were so numerous that a village was needed to accommodate them. The assembly attracted many merchants so the Fair of Beaucroissant was begun.
The official status of the blazon remains to be determined.
Blazon: Party per bend sinister, at 1 Azure a cow's head caboshed Argent; at 2 Vert a horse's head Argent; in chief Gules, a crescent Argent from which spread nine rays the same.
The Beaucroissant Fair, which takes place twice a year, is the main economy of the commune. In 2015 it took place on 25 and 26 April and on 11, 12, and 13 September together with the cattle fair on Friday 11 September.
ThePriory of Our Lady of Parménie was a Chartreuse of women in the 13th century. It was burnt down in the 15th century, rebuilt in the 17th century, burnt down in 1944, then restored.