In a bowl, combine yogurt, honey, and salt; mix well. Fold in 1 cup trail mix.
Line a 9×13 inch pan with plastic wrap. Spread yogurt mixture evenly onto the base of the pan to cover. Sprinkle surface of the yogurt with remaining trail mix. Cover and freeze to set.
When the yogurt mixture is frozen solid (3-4 hours), break the bark into shards and serve immediately. Bark can be broken and placed in a plastic bag and kept frozen for up to 2 weeks.