Bierstadt was part of the Hudson River School, not an institution but rather an informal group of like-minded painters. The Hudson River School style involved carefully detailed paintings with romantic, almost glowing lighting, sometimes called luminism. An important interpreter of the western landscape, Bierstadt, along with Thomas Moran, is also grouped with the Rocky Mountain School.
Though his paintings sold for princely sums, Bierstadt was not held in particularly high esteem by critics of his day. His use of uncommonly large canvases was thought to be an egotistical indulgence, as his paintings would invariably dwarf those of his contemporaries when they were displayed together. The romanticism evident in his choices of subject and in his use of light was felt to be excessive by contemporary critics. His paintings emphasized atmospheric elements like fog, clouds and mist to accentuate and complement the feel of his work. Bierstadt sometimes changed details of the landscape to inspire awe. The colors he used are also not always true. He painted what he believed was the way things should be: water is ultramarine, vegetation is lush and green, etc.
Nonetheless, in 1860 he was elected a member of the National Academy; he received medals in Austria, Bavaria, Belgium, and Germany;and his paintings remain popular. He was a prolific artist, having completed over 500 (possibly as many as 4000) paintings during his lifetime, most of which have survived. Many are scattered through museums around the United States. Prints are available commercially for many. Original paintings themselves do occasionally come up for sale, at ever increasing prices.
In 1882 his studio at Irvington, New York, was destroyed by fire, with many of his pictures.