USDA Forest Service

Forest Inventory & Analysis
National Office
U.S. Forest Service
1400 Independence Ave., SW
Washington, D.C. 20250-0003

(703) 605-4177

United States Department of Agriculture Forest Service.

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The Forest Inventory and Analysis (FIA) Program of the U.S. Forest Service provides the information needed to assess America's forests.

The long history of scientifically credible FIA data provides critical status and trend information to resource managers, policy makers, investors, and the public through a system of annual resource inventory that covers both public and private forest lands across the United States.

FIA reports on status and trends in forest area and location; in the species, size, and health of trees; in total tree growth, mortality, and removals by harvest; in wood production and utilization rates by various products; and in forest land ownership.

For more information on the FIA program, please see our About Us page.

Urgent Notifications & Bulletins:


*** Notice ***   The CIO performs regular maintenance updates on our servers on Friday nights between 9 and 11 pm EST. Online tools may be briefly unavailable during the maintenance window. Thank you for your understanding.

User Alerts:
  • Jun 21, 2022: Warning: Estimates and statistics based on Alaska borough and census areas may be misleading! 
    FIA’s Alaska inventory is ongoing and many survey units have yet to be sampled. The FIA inventory Alaska survey unit boundaries do not follow Alaska’s borough and census area boundaries or ecoregions. The survey units were outlined broadly encompassing major watershed boundaries. Because much of Alaska is not organized into a recognized borough (county equivalent), the FIA program utilizes the Census Bureau Census Area boundaries as the county equivalents in those areas. However, Alaskan borough and municipality boundaries have changed multiple times since the inception of the FIA annualized inventory (~2004). The Census Bureau has also frequently changed Alaskan Census Area boundaries over that same timeframe. Therefore, any FIA reported estimates reflect only the Alaska survey units involved. Any estimates and summary statistics calculated based on borough or Census Area spatial extents may be misleading due to the variability of these features. For more information please see the supporting documentation here.

  • Nov 4, 2021: Warning! ATIM reports using either County, Unit, or NFS Administrative Forest Code ALP as the column format selection will result in inaccurate results in both the Excel and XML output. This issue is not present with HTML output.

  • Aug 6, 2020: We are in the process of updating periodic remeasurement datasets for some states. You can find the list of affected states and their associated evaluation groups along with supporting documentation here.

For more information contact any of the following:

Rocky Mountain Research Station - Analysis Team   (

Pacific Northwest Research Station - Glenn Christensen ( 503-808-2064

Northern Research Station - Charles Barnett NRS ( 603-868-7620

Southern Research Station - Carol Perry ( 828-257-4236

  • ** The FIA website will be moved to a USDA web domain by August 1, 2022. **
    This change will impact the url of all of our pages - going from to
    - It is recommended that users navigate through our site from the homepage.
    - Any broken links or issues with the site can be reported to
    Please update bookmarks that you may have to any of our site pages to reflect the new domain name.

  • Updates to tree volume, biomass, and carbon models will impact data on FIA DataMart. These changes should be in effect and reflected in data late July-early August 2022. More information on this change here. (PDF 280KB)

  • ** EVALIDator 2.0 is LIVE! **
    Please connect via the Data and Tools page and update any saved URLs you might have!

An archive of past notifications and bulletins is also available.

Popular Topics:
FIA Business Reports

Business Reports and Program Accountability

FIA readily provides annual business reports and other organizational documents (e.g., strategic plans, National User Group Notes) to make ourselves more accountable to our partners and customers.

Photo: Covers of various FIA business documents
Data and Tools

Data and Tools

The FIA program has been serving data to the public since 1996 through a variety of web tools. The Data and Tools page contains links to these tools and data, such as: DATIM, FIA and Urban DataMarts, Spatial Data Services, Engagement Portfolios, National Woodland Owner Survey data, and tool trainings and tutorials.

NEW - Chicago Urban FIA data now available in My City's Trees!

Photo by US Forest Service, Pacific Northwest
Cover of FIA P2 User Manual

Forest Inventory and Analysis Database (FIADB) User Guides

The Forest Inventory and Analysis Database (FIADB) User Guides series includes multiple documents. These documents provide detailed information for the FIADB.

Photo: Covers of FIA P2 User Manuals
FIA Contribution to National & Global Reporting

FIA Contributions to National and Global Reporting

The FIA program is the primary official source of authoritative information to national and global assessments, reports, and statistics on the status, conditions and trends of the U.S. forests and the services they provide.

Photo: Image from cover of 2020 RPA
Latest FIA National Newsletter

FIA National Newsletter

FIA's monthly national newsletter provides updates across the regions and to FIA's stakeholders on ways that FIA is engaging the communities we serve. The newsletter also highlights engagements across FIA units nationally to further FIA's mission and ensure national consistency, collaboration and coordination.

Photo: First page of a FIA National Newsletter
FIA Publication Search

FIA Publications

FIA publications can be easily searched and downloaded using Treesearch, an online system for sharing publications by scientists in the Forest Service. Included in Treesearch are research findings, reports, peer-reviewed scholarly works published in journals, conference proceedings, or books, as well as scholarly works published in collaboration with other agencies, organizations and universities.

Photo: Covers of various FIA publications

USDA Forest Service
Last Modified: April 14, 2020

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site. Strategic Plans Annual reports National User Group Notes