The Andrew and Bergette Hjertoos Farm is historically significant under Criterion A and C as an illustrative example of the economic success of early 20th century family dairy farming in the Snoqualmie River Valley in east King County, Washington. The property has been directly associated for nearly one hundred years with several generations of the Hjertoos family, Norwegian immigrants who settled in the valley in the 1890s. The farm consists of an ornately detailed dwelling and a large hay barn dating from 1907 and ca. 1910, respectively, as well as surrounding acreage now converted to new agricultural use as a Christmas tree farm.

The land which became Hjertoos property occupies a strategic location at the confluence of the Tolt and Snoqualmie Rivers. Ethnographic records note the presence of a major village of native Snoqualmie people in the vicinity of the farm. It served as the site of an important ferry crossing over the Snoqualmie for early settlers, and as a shelter and camp for newly arrived immigrants seeking to earn money in the hops fields that proliferated in the valley in the 1870s and '80s. - NRHP, September 2000