Summary of total overwintering colony losses in the United States across eleven years of the winter loss survey (yellow bars, October 1–April 1) and across six years of the summer (April 1–October 1) and annual loss survey. Click for larger view and more information.
Total annual loss values (orange bars) include total winter and total summer losses. The acceptable winter loss rate (grey bars) is the average percentage of acceptable yearly colony losses declared by the survey participants in each year of the survey. The survey was conducted by the Bee Informed Partnership Inc. Graphic and data source: Bee Informed Partnership Inc. Used with permission.