Where is White-nose Syndrome Now?

This map shows the occurrence of white-nose syndrome or the causative fungus (Pd) in North America at the resolution of county or district. County and district designations are reported by State, Provincial, Federal or other relevant management authorities to reflect documented presence of the disease WNS (solid) or indications that WNS or Pd may be present (striped). Solid or striped colored counties or districts are areas in which one or more bats of at least one species have been observed with signs of WNS or carrying Pd. The color for each area represents the first winter in which the indicated status was determined.

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Areas that are not identified as WNS confirmed or suspect (gray areas) likely fall into one of three categories: no sampling locations are known in the area, no samples have been collected in the area, or all samples have been negative or inconclusive for WNS and Pd. Bats dispersing from winter locations with documented occurrence of WNS and Pd are likely to disperse into surrounding gray areas with no known occurrence during spring, summer, and fall. Especially in areas where many locations have been confirmed or suspect for WNS for several years, bats should be assumed to be affected by WNS regardless of known occurrence in the county, unless additional information supports otherwise.

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Map updated August 1, 2025

States and Provinces Where WNS Has Been Confirmed: