[1][2] She was the second daughter of public attorney Christian Lasson and Alexandra Cathrine Henriette von Munthe af Morgenstierne.

Her husband took a position as an art instructor at Académie Colarossi in Paris not long thereafter and Oda obtained an artist's studio in Montparnasse.

Her debut was in 1886 with Ved Kristianiafjorden (Japansk lykt) («By the Oslofjord (Japanese lantern)»), which now is stored in the National Gallery of Norway.

Oda Krohg is known for her landscapes, among them Ved Kristianiafjorden (Japansk lykt) and Ved engen (Kinesisk lykt) («On the meadow (Chinese lantern)», 1889) and other works like En abonnent på Aftenposten («A subscriber to the Evening Post», 1887), Fra festen («From the party», 1892) and Rouge et Noir (1912) and the brave Christian Krohg på Karl Johan («Christian Krohg at Karl Johansgate», 1912).

She also painted portraits of, among others, Aasta Hansteen, Ivar Arosenius, Gunnar Heiberg, Johanne Dybwad and Christian Krohg.

Her public image as the "Bohemian Princess" has to some extent obscured the impression of a competent painter.

Krohg exhibited her work at the Palace of Fine Arts at the 1893 World's Columbian Exposition in Chicago, Illinois.

The song "Sommernatt ved fjorden" (1978) by Ketil Bjørnstad, sung by the operasinger Ellen Westberg Andersen, describes Hans Jaeger and Oda Lasson in a small boat out on the fjord on a summer night.