Leaky Rayleigh waves propagating along the bottom side of floating sea‐ice plates experience cylindrical geometrical spreading and have their low‐frequency limit determined by the ice plate thickness that corresponds to about 560 Hz. A second type of leaky Rayleigh wave can exist along ice plate edges propagating with no geometrical spreading and has its low‐frequency limit determined by the large plate horizontal dimensions. Laboratory ultrasonic modeling results are presented demonstrating the detection of low‐frequency Rayleigh waves radiated from ice plate edges. In one experiment, the plate‐edge leaky Rayleigh wave wavelength was greater than 12 times the ice plate thickness. The results suggest that a 3‐m‐thick ice plate in the Arctic may easily radiate 10‐ to 100‐Hz components from its edges. The ice plate edge acting nearly as a finite length line source produces high directionality of the radiated leaky Rayleigh wave into the water. The low‐frequency plate‐edge leaky Rayleigh waves may be detected in the water at significant distances from the ice edge. Additional physical insights into the controversial leaky Rayleigh wave are provided by comparing water/ice and Freon‐113/ice interface conditions where a high‐density low‐velocity liquid is used. [Work supported by ONR.]