Ahtanum® is named for the location where Charles Carpenter established the first hop farm in the Yakima Valley in 1869. It is the first commercially available bred hop by Yakima Chief Ranches. Used primarily as an aroma hop due to low alpha acid composition.
| Alias | YCR1 |
| Profile | Citrus (grapefruit), earthy and floral. Piney has been associated as well. |
| Country | United States |
| Substitutes | Amarillo®, Cascade, Centennial, Simcoe®, Willamette |
| Pairs with | Amarillo®, Cascade, Citra®, Crystal, Mosaic® |
| Purpose | Aroma |
| Yield | 1600 - 1800 lbs/acre |
| Storage | Retains 50 - 55% alpha acid contents after 6 months of storage at 68°F. |
| Beer Styles | American Pale Ale, IPA, California Common, ESB |
| Resistant | Downy mildew |
| Tolerant | Powdery mildew |
| Alpha Acid | 3.5 - 6.7% |
| Beta Acid | 4.0 - 6.5% |
| Cohumulone | 30.0 - 35.0% |
| Total Oil | 0.5 - 1.7 ml/100g |
| Myrcene | 45.0 - 55.0% |
| Humulene | 15.0 - 22.0% |
| Caryophyllene | 9.0 - 12.0% |
| Farnesene | < 1.0% |
| Linalool | 0.4 - 0.6% |
| B-Pinene | 0.6 - 0.9% |
| Geraniol | 0.4 - 0.7% |
| Growth Rate | Moderate |
| Cones | Small size with compact density |
| Maturity | Middle |
| Ease of Harvest | Good |