Evapotranspiration (ET) is an important parameter in the water cycle of an eco system. However, ET is also often difficult to determine. The aim of this work is \nto make a first comparison of different methods for determining ET at an alpine grassland site. Data from a lysimeter and a scintillometer are compared with data from two reference evapotranspiration methods (ETC, ET0). For the period April-August 2018, ETc showed the best fit with the lysimeter ET (r²=0.83), whereas ET0 correlated best with the scintillometer ET (r²=0.97). These relation ships can be attributed to the different consideration of the LAI and the growth height in the two different methods. As a possible consequence, the ET0 method could be used to estimate ET for heterogeneous grassland stands and ETc for homogeneous ones. However, further datasets must be analysed to be able to \nconsolidate this conclusion.