National Trail Mix Day is observed on August 31, 2017. Trail mix is a combination of dried fruit, grains, nuts, and sometimes chocolate, developed as a snack food to be taken along on hikes. Trail mix is considered an ideal snack food for hikes, because it is lightweight, easy to store, and nutritious, providing a quick energy boost from the carbohydrates in the dried fruit or granola, and sustained energy from fats in nuts.
Both Hadley Fruit Orchards and Harmony Foods (two California growers) claim that trail mix was first invented in 1968 by two California surfers who blended peanuts and raisins together for an energy snack. However, trail mix is also mentioned in Jack Kerouac's 1958 novel The Dharma Bums as the two main characters describe their planned meals in their preparation for a hiking trip. (With material from: Wikipedia)