Stores' risk scores are based on more than two dozen metrics, including racial diversity, employee turnover, and "tipline" calls.
The heat map reveals how Whole Foods is using technology and data to help manage its vast workforce of more than 95,000 employees.
It also provides a rare look into corporate labor-tracking activities, a common practice among large companies but one rarely discussed publicly.
A statement on the map describes its purpose as specific to monitoring unionization among its employees, which the company calls team members.
"The [Team Member] Relations Heatmap is designed to identify stores at risk of unionization," the statement reads. "This early identification enables resources to be funneled to the highest need locations, with the goal of mitigating risk by addressing challenges early before they become problematic."
Whole Foods did not respond to questions about what sort of resources are funneled to the "highest need" stores.
