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The ground state rotational spectrum of 2,3,6-trifluoropyridine has been investigated in the 2.0-20.0 GHz region by pulsed jet Fourier transform microwave spectroscopy.The experimental rotational constants are A=3134.4479(2) MHz,B=1346.79372(7) MHz,and C=941.99495(6) MHz.The transitions are so intense that rotational transitions of all mono13C and 15N isotopologues are measured in natural abundance.The semi-experimental equilibrium rotational constants of the 7 isotopologues were derived by taking account of the anharmonic vibrational corrections,which allowed a semi-experimental determination of the equilibrium structure of 2,3,6-trifluoropyridine.