Skip to main content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

FVS Variant Key and Included Extensions

The tables on this page are a key to the FVS variant codes, and summarize the models and extensions currently available for each geographic variant.

Forest Vegetation Simulator Geographic Variants and Related Extensions (refer to the following table for a Key to the Extension Codes)
Variant Code Climate COV DM ECON ESTB FFE STRP WRD
Southeast Alaska and Coastal British Columbia AK   X X X X X    
Blue Mountains BM X X X X   X X X
Inland California and Southern Cascades (ICASCA) CA X X X X   X X  
Central Idaho CI X X X X X X   X
Central Rockies CR X X X X   X X X
Central States CS       X   X X  
East Cascades EC X X X X   X X X
Eastern Montana EM X X X X X X   X
Inland Empire IE X X X X X X   X
Klamath Mountains NC X X X X   X X X
Kootenai, Kaniksu, and Tally Lake (KooKanTL) KT X X X X X X   X
Lake States LS       X   X X  
Northeast NE       X   X X  
Pacific Northwest Coast PN X X X X   X X X
Southern SN       X   X X  
South Central Oregon and Northeast California (SORNEC) SO X X X X   X X X
Tetons TT X X X X   X X X
Utah UT X X X X   X X X
Westside Cascades WC X X X X   X X X
Western Sierra Nevada WS X X X X   X X X
Key to Extension Codes
Code FVS Extension
COV COVER/SHRUBS
DM Dwarf Mistletoe
ECON Economic
ESTB Full Regeneration/Establishment
FFE Fire and Fuels Extension to FVS
STRP Partial Regeneration/Establishment
WRD Western Root Disease