Snake repellent for yards and gardens

Barely. Snakes lack external ears and hear airborne sound poorly, mostly at low frequencies far below the ultrasonic range advertised. Any real effect from a snake stake comes from the ground vibration and pulsing it produces, not from the high-pitched tone, which is why the vibration mechanism matters and the sound largely does not.

They can lose effectiveness two ways. Snakes may habituate to a constant, harmless pulse and start ignoring it, which randomized timing and flashing LEDs help resist. Separately, solar cells and rechargeable batteries degrade over several seasons, so an aging unit produces weaker pulses. Refreshing or replacing units and combining them with habitat cleanup keeps the deterrence meaningful.

One stake only influences a few meters of soil, and less in dry or sandy ground that dampens vibration. For real coverage, space several units around the perimeter and along the routes snakes use, such as fence lines and shed edges, rather than placing a single stake in the open. Pair them with clearing cover and rodents for best results.