is a hop cultivar grown originally by the Yakima Chief Ranches. Ahtanum is reported to be an open-pollination cross among Brewer’s Gold, Fuggle, East Kent Golding, and Bavarian aroma hops. The variety’s name is derived from early Yakima Valley hop history when Charles Carpenter brought hop rhizomes to the area and grew them on his homestead at Ahtanum, now a small community west of Yakima. The cultivar has never been popular with large breweries. Thus, acreage is low. It has been favored, however, by many craft brewers. The cultivar is tolerant to downy mildew (Pseudoperonospora humuli). See downy mildew. It matures in mid- to late season and typically yields 800 to 1,000 kg (1,760 to 2,200 lb) per acre. Ahtanum has an alpha acid range of 5.7% to 6.3%, a beta acid range of 5% to 6.5%, and a cohumulone range of 30% to 35%. Its aroma profile is floral, citrus, and piney, with grassy notes. The essential oil content is 50% to 55% myrcene, 16% to 20% humulene, 9% to 12% caryophyllene, and 1% farnesene, which makes it similar in aroma characteristics to Cascade, Centennial, and, to a lesser extent, Amarillo. It is typically used as a late or dry aroma hop, especially in American craft-brewed pale ales, India pale ales (IPAs), and “double IPAs.”