Moisture activates and is the best conduit for the effectiveness of the product. While frozen, its effectiveness will be less and as it thaws the effectiveness will increase. Once it is active and in normal conditions, Deer Ban capsules will continue to emit the odor that deer detect and it will slowly, over months, breakdown and biodegrade. As long as it is not washed away by an extremely hard rain, Deer Ban will continue working for up to 90 days.