Ecosystem stations provide primarily data on turbulent fluxes of greenhouse gases and energy. In addition, a wide range of meteorological parameters in the air and the soil are measured. Furthermore, data on other ecosystem parameters are collected periodically. ICOS Sweden operates six Ecosystem stations:
Hyltemossa, Mycklemossen, Norunda, Degerö, Svartberget, and Abisko-Stordalen. 

The agricultural site Lanna was part of ICOS Sweden until the end of 2020. Data from the period 2014 to 2020 is available on the ICOS Carbon Portal.