The anti-freezing (or freezing delay) characteristics of sessile water droplets placed on bare and superhydrophobic surfaces were experimentally investigated. The change of the droplet temperature during the cooling and freezing processes was monitored under a constant surface temperature. The freezing delay time was calculated for a statistically large ensemble of droplets, which showed a random distribution. The minimum and maximum freezing delay times of droplets on the bare and superhydrophobic surfaces were analyzed by using a cumulative distribution function. The maximum freezing delay time of the superhydrophobic surfaces was more than three times longer than that of the bare surfaces. Moreover, about 7% of the water droplets on the superhydrophobic surface could be frozen earlier than or similarly with those on the bare surface. (C) 2016 Elsevier Ltd. All rights reserved.