Herfstbok is often called autumn bock bier. The style was modeled on bock bier—a type of strong and dark lager that originated in Germany. Dutch bock beers grew into a distinct style, and herfstbok is one of the seasonal varieties released by major and microbreweries.
Although it is not a mainstream style or available year-round, it is becoming increasingly popular. Herfstbok is now produced as top (ale) or bottom-fermenting (lager), and it is generally a broad category that does not have set guidelines. Most examples are dark beers with a dominant malty character.