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:

User Alert:

*** 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.

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..

Oct 21, 2021: Warning! FIA’s Alaska inventory is not spatially complete and FIA inventory unit boundaries do not follow Alaska’s borough and census area boundaries or ecoregions. Therefore, estimates and statistics based on these spatial features may be misleading. For more information, please refer to the supporting documentation here.

Sep 27, 2021: There is a known issue with EVALIDator and the EVALIDator API regarding temporal selections in change reports. If users select Inventory Year for the page, row or column, only the Current temporal option is recognized and used for reports even if a different temporal selection is made.

Jun 14, 2021: EVALIDator continues to experience stability issues. The CIO has determined that the server on which EVALIDator is currently running is unstable, causing intermittent unavailability. If you are unable to access EVALIDator, please use DATIM. DATIM provides the same capabilities as EVALIDator, as well as additional features that users will likely find useful.

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

  • 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 now available for external testing and feedback prior to our anticipated live release in early June. Please provide feedback by Wednesday, May 25, to
    Further information on EVALIDator is available in this briefing, with more information on the new EVALIDator 2.0 interface here.

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