USFWS Critical Habitat Explorer

The Critical Habitat Explorer provides interactive access to official U.S. Fish and Wildlife Service (USFWS) critical habitat designations for endangered and threatened species across the United States. This tool displays both final designated habitats and areas proposed for critical habitat protection, allowing conservationists, researchers, land managers, and the public to explore and download precise habitat boundaries.

Critical habitat designations identify specific geographic areas containing features essential for the conservation of threatened or endangered species under the Endangered Species Act. These areas may require special management considerations or protection to ensure species recovery. Our map displays official USFWS data updated as of August 2025, showing thousands of habitat units for hundreds of protected species nationwide.

Understanding Critical Habitat Designations

Critical habitat serves as a cornerstone of species conservation under the Endangered Species Act. When a species is listed as endangered or threatened, USFWS designates specific areas as critical habitat if they contain physical or biological features essential to the species’ conservation and may require special management.

The map displays two types of habitat designations: Final Critical Habitat (shown in green) represents officially designated areas with legal protections in place, while Proposed Critical Habitat (shown in orange) indicates areas currently under consideration for designation through the federal rulemaking process. Toggle either layer on or off using the legend controls to focus on specific designation types.

How to Use the Critical Habitat Map

• Explore habitat areas: Pan and zoom across the United States to view critical habitat boundaries. The map initially displays the contiguous U.S. at an optimised zoom level for quick loading.
• Toggle layers: Use the checkboxes in the legend to show or hide Final Critical Habitat (green) and Proposed Critical Habitat (orange) independently.
• View species details: Click any habitat polygon to display detailed information including the species common name, scientific name, listing status, habitat unit name, area in acres and square miles, and publication dates.
• Download boundaries: After selecting a habitat, click GeoJSON, KML, or GPX to download the precise boundary geometry for use in GIS software, GPS devices, or conservation planning applications.

Critical Habitat Data and Download Formats

Download options support multiple geospatial file formats to accommodate different software and workflows:

GeoJSON: Standard web mapping format compatible with most modern GIS software, web mapping libraries, and spatial databases. Ideal for QGIS, ArcGIS Online, and web applications.

KML (Keyhole Markup Language): Google Earth-compatible format perfect for visualisation, field work planning, and sharing with stakeholders. Opens directly in Google Earth and many GPS applications.

GPX (GPS Exchange Format): Standard GPS data format for outdoor navigation devices, hiking apps, and field data collection. Compatible with Garmin, Magellan, and smartphone GPS applications.

Downloaded files include complete attribute data such as species names, habitat unit identifiers, effective dates, and area measurements, ensuring you have full context for GIS analysis and conservation planning.

Applications for Critical Habitat Data

Environmental professionals, researchers, and land managers use critical habitat data for numerous applications:

Project planning and environmental impact assessments require identifying potential conflicts with protected species habitats. Development projects, infrastructure planning, and land use decisions must account for critical habitat locations to ensure Endangered Species Act compliance.

Conservation organisations use habitat boundaries to prioritise land acquisition, restoration projects, and species recovery efforts. Understanding the spatial extent of critical habitat helps focus limited conservation resources on areas most essential for species survival.

Research scientists studying species ecology, habitat requirements, and population dynamics utilise critical habitat data to guide field studies and analyse species-habitat relationships across landscapes.

Federal and state agencies consult critical habitat maps during permitting decisions, land management planning, and Section 7 consultations under the Endangered Species Act.

Frequently Asked Questions

What is critical habitat, and why does it matter?

Critical habitat is a specific geographic area containing physical or biological features essential for the conservation of a threatened or endangered species that may require special management considerations or protection. These designations are established under the Endangered Species Act and help ensure species recovery by protecting the places where listed species live, feed, breed, and shelter. Activities on federal lands or requiring federal permits must undergo consultation to avoid destroying or adversely modifying critical habitat.

How often is critical habitat data updated?

The USFWS critical habitat data displayed in this map reflects official designations as of August 2025. USFWS regularly updates critical habitat as new species are listed, recovery information becomes available, or proposed habitats are finalised through the federal rulemaking process. Check the USFWS website for the most current regulatory information, as new proposals and final designations occur throughout the year.

What’s the difference between Final and Proposed critical habitat?

Final Critical Habitat (green) represents officially designated areas with legal protections currently in effect under the Endangered Species Act. Federal agencies must consult with USFWS before authorising activities that may affect these areas. Proposed Critical Habitat (orange) shows areas currently undergoing public comment and federal review for potential designation. While the proposed habitat doesn’t carry the same legal requirements as final habitat, agencies are encouraged to consider these areas during planning.

Can I use downloaded habitat boundaries for regulatory compliance?

While this tool provides official USFWS data, always verify critical habitat boundaries with the most current Federal Register publications and consult directly with USFWS for regulatory compliance questions. Critical habitat boundaries can be revised through the rulemaking process, and specific project reviews may require field verification or species surveys. Use downloaded data as a planning tool and starting point, but coordinate with USFWS for formal Section 7 consultations and regulatory determinations.

Which GIS software works with the downloaded file formats?

GeoJSON files work with QGIS, ArcGIS Pro, ArcGIS Online, PostGIS, and web mapping libraries like Leaflet and Mapbox. KML files open in Google Earth Pro, ArcGIS Earth, and many GPS applications, including Garmin BaseCamp and smartphone navigation apps. GPX files are compatible with handheld GPS devices from Garmin, Magellan, and other manufacturers, plus outdoor apps like AllTrails, Gaia GPS, and Komoot. Most modern GIS platforms can import all three formats.

Does critical habitat designation affect private land?

Critical habitat designation primarily affects federal actions—activities on federal lands or requiring federal permits or funding. Private landowners conducting activities without federal involvement typically aren’t restricted by critical habitat designation alone. However, other Endangered Species Act provisions prohibiting ‘take’ of listed species apply regardless of land ownership. Landowners planning activities in or near critical habitat should consult with USFWS to understand potential requirements and voluntary conservation opportunities.

How do I find critical habitat for a specific species?

Use the map’s zoom and pan functions to navigate to areas where your target species occurs. Click habitat polygons to view detailed information, including species common name and scientific name. Since habitat units may be geographically dispersed for species with fragmented populations, you may need to explore multiple regions. For comprehensive species information, cross-reference map data with USFWS species profiles and recovery plans available on the Environmental Conservation Online System (ECOS) website.

What coordinate system are the downloaded boundaries in?

All downloaded boundaries are provided in WGS 84 geographic coordinates (latitude/longitude), the standard coordinate system for GPS and most web mapping applications. This ensures broad compatibility across GIS software and GPS devices without requiring coordinate system transformations. If your project requires data in a different coordinate system or projection, most GIS software can easily reproject the downloaded files to your preferred reference system.