Link to FRAGSTATS Home Page
Link to FRAGSTATS Downloads
Link to FRAGSTATS Frequently Asked Questions Page
Links to Websites with Landscape Pattern Analysis Software
Link to FRAGSTATS workshops home page

FRAGSTATS: Spatial Pattern Analysis Program for Categorical Maps



This page is where you go to download the software, tutorials, diagnostic and other utility tools and learn about the latest release.

Release Notes

FRAGSTATS was developed as a research tool. Although we have done considerable testing of the software, it is possible that users will discover bugs that arise under specific conditions that we did not test (please report all bugs immediately to Dr. Kevin McGarigal, Patches to correct for bugs will be released with the same version number (e.g., 4.2), but will be assigned a unique and sequential "build" number. If you are not sure what build number you have, it is listed in the "About FRAGSTATS" description available from the Help Menu after openning the FRAGSTATS executable. The latest build will be available from the download link below. Substantial changes to the software, primarily associated with the addition of new features (e.g., new metrics), will be released as a new version number, and all changes associated with each release will be documented in the release notes. Thus, it is important to check the release notes before downloading a new version. Similarly, all major updates to the Tutorials (see below) will be documented in the release notes.

Please note, the current development version is 4.2. We are no longer providing support for earlier versions.

Please also note that all of the FRAGSTATS documentation is viewable as a pdf file from the documentation web page and via the on-line Help function in the FRAGSTATS software and you should consult this documentation before contacting the developers.


This software is in the public domain, and the recipient may not assert any proprietary rights thereto nor represent it to anyone as other than an Oregon State University-produced program (version 2), University of Massachusetts-produced program (version 3), or LandEco Consulting-produced (Dr. McGarigal, sole propeitor)(vesion 4). FRAGSTATS is provided "as is" without warranty of any kind, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. The user assumes all responsibility for the accuracy and suitability of this program for a specific application. In no event will the authors or the University be liable for any damages, including lost profits, lost savings, or other incidental or consequential damages arising from the use of or the inability to use this program.


FRAGSTATS software (version 4.2)


Size: 5.83 MB

Last updated: 1/23/2015

Description: This is the latest release of FRAGSTATS version 4.2 (build, that includes a variety of sampling options for analyzing sub-landscapes under the categorical or patch mosaic landscape structure model.


  • Installing FRAGSTATS -- After downloading the FRAGSTATS software (below), simply extract the files to your local disk and double-click on the setup file (e.g., frg_setup_4.2.exe) and follow the onscreen instructions. Note, you may need to turn off your anti-virus software to allow the installation on your machine, depending on your configuration. Once installed, FRAGSTATS is run by double clicking on the corresponding .exe file or, more likely, from the Start menu or by double clicking on the desktop icon. Note, this is a windows-based application designed for raster images in a variety of formats. Be sure to check the release notes before downloading. Also, all FRAGSTATS documentation is included in the Help system available from the Help menu in FRAGSTATS. This documentation is identical to the information found on the documentation page of this web site.

  • ESRI ArcGIS Users -- FRAGSTATS 4.2 can read ESRI ArcGrids (or Rasters) as the input data format, but you must have a valid license for Spatial Analyst and it only works with ArcGIS version 10.0 or earlier (however, if you have a later version you can always work with other data formats such as geotiffs with FRAGSTATS). Note, subsequent versions of FRAGSTATS (i.e., >4.2) will no longer support ESRI ArcGrids due to continual conflicts with the ESRI license manger updates. All future releases will use GeoTIFFS as the primary data format, although several other data formats will be supported. To use FRAGSTATS 4.2 with ArcGIS 10.0 or earlier, you must have a PATH variable in your system's environmental settings that points to the Bin folder containing the aigridio.dll file that comes with ArcGIS or the Bin32 folder containing the avgridio.dll file that came with the earlier ArcView 3.3 Spatial Analyst Extension. This PATH will ofen look like this: C:\Program Files (x86)\ArcGIS\Desktop10.0\Bin for a Windows 7 Professional 64-Bit system. Note, the PATH does not end with the aigridio.dll file name -- a common error among users. Of course, the exact PATH may vary depending on your installation of ArcGIS, so be sure to enter the correct path for your system. In addition, make sure that the PATH to the Bin directory is the FIRST path listed that contain ArcGIS. This PATH variable allows you to install and run FRAGSTATS from any directory on your hard disk. Alternatively, you can run FRAGSTATS from the folder containing the required .dll file, but this is not advisable. Detailed instructions for changing your environmental settings are given in the help files on data formats and in tutorial #1. In addition, if you are using ArcGrids, you cannot have spaces in the path to the directory containing the grids. Note, this pertains to the path to the grids, not the path to the Bin folder above. For example, the following path is illegal: "c:\Users\Smith\My Documents\Grids" because of the space between "My" and "Documents".

FRAGSTATS tutorials


Size: 15.512 MB

Last updated: 1/23/2015

Description: This is a tutorial on how to use the FRAGSTATS 4 software and is intended to illustrate the basic capabilities of the software. It includes 6 individual, self-contained tutorials covering: 1) installing the software and inspecting the grids, 2) analyzing a single grid, 3) batch processing multiple grids, 4) moving window analysis, 5) running the command line version from R, and 6) using the sampling options to analyze sub-landscapes. All the necessary data and files for each tutorial are provided. Simply download the zip file and extract the files to a directory of your choosing, preferably one without spaces in the path, since this can cause problems if you intend to work with ESRI ArcGrids (see note to ESRI ArcGrid users above). The tutorial instructions is a pdf file in the root directory.

In addition, we would appreciate any feedback that you can provide on these tutorials: was there anything unclear or confusing in the directions? which tutorials did you work through and were they helpful? are there other topics you would like to see covered in a tutorial?

Diagnostic tool for ArcGIS users


Size: 611 KB

Last updated: 6/1/2012

Description: If you are an ArcGIS (version 10.0 or earlier) user and you believe that you have a valid ArcGIS licencse (version 10.0 or earlier) with Spatial Analyst and you enter any problems installing and executing FRAGSTATS 4.2, before reporting any problems, download this Diagnostic tool and run the executable (by double clicking on the executable). This will determine the status of your ArcGIS installation and report on the details of your setup that will help us diagnose your problem. Copy the report produced and submit it with your email along with a detailed description of the problem, including what happens exactly and when.

Grid-to-table conversion tool for ArcGIS users


Size: 614 KB

Last updated: 11/08/2013

Description: If you are an ArcGIS user and you are interested in using the sampling option for user-provided points to analyze sub-landscapes centered on point locations that you provide in the form of either a grid or table, this conversion tool (g2t.exe) will convert an ESRI ArcGrid, in which each focal point has a unique cell value and all other cells are designated as nodata, into a properly formatted points table for FRAGSTATS. Note, converting a points grid into a points table is only useful for large grids in which computer memory is a constraint; otherwise, use the points grid directly in FRAGSTATS. See the readme file included with the executable on the use of this tool.

R package for working with FRAGSTATS


Size: 17 KB

Last updated: 3/04/2014

Description: This is an R package containing functions to facilitate working with FRAGSTATS in R. Currently, it is a single function for combining the FRAGSTATS output landscape (.land) and class (.class) files into a single wide format dataset in preparation for subsequent analysis. However, the intention is to compile a suite of utility functions for working with FRAGSTATS output, with contributions from multiple authors. So, if you have a function that you think has general utility and might be of interest to other FRAGSTATS users, please send the function along with sample data to K. McGarigal for consideration to be included in this package, with credit given to the author.


For more information, please contact:
Dr. Kevin McGarigal
Department of Environmental Conservation
University of Massachusetts
304 Holdsworth Natural Resources Center
Box 34210, Amherst, MA 01003
Fax: (413) 545-4358; Phone: (413) 577-0655

Copyright 2000 University of Massachusetts Amherst, Massachusetts, 01003. (413) 545-0111. This is an official page of the University of Massachusetts Amherst campus. All material in this website is made available according to the Fair Use Statute of the U.S. Copyright Act