This is a bit more simple:

static int jumpingOnClouds(int[] c) {
    int jumps = 0;
    for(int i = 0; i < c.Length - 1; i++){
        jumps++;
        if( i  + 2 < c.Length && c[i + 2] == 0){
            i++;
        }
    }
    return jumps;
}