The title compound, C(10)H(11)F(3)N(2)O, is an important urea-based herbicide. In the crystal structure, the mol-ecular packing is stabilized by two intra-molecular C-H⋯O hydrogen bonds and one inter-molecular N-H⋯O hydrogen bond, generating a C(4) graph-set motif running parallel to the [001] direction. The F atoms are disordered over two sites, with occupancies of 0.176 (9) and 0.824 (9).