The main rabi crop in Himachal Pradesh is:

Wheat
Rice
Maize
Barley

The main rabi crop in Himachal Pradesh is wheat. Wheat is a winter crop that is grown in the months of October to March. It is a major food crop in India and is grown in all parts of the country. Wheat is a cereal grain that is used to make bread, pasta, and other food items. It is a good source of carbohydrates, protein, and fiber.

Rice is a summer crop that is grown in the months of June to September. It is a major food crop in India and is grown in the states of Punjab, Haryana, Uttar Pradesh, and West Bengal. Rice is a cereal grain that is used to make rice dishes such as biryani, pulao, and idli. It is a good source of carbohydrates, protein, and fiber.

Maize is a summer crop that is grown in the months of June to September. It is a major food crop in India and is grown in the states of Andhra Pradesh, Karnataka, Tamil Nadu, and Maharashtra. Maize is a cereal grain that is used to make cornbread, tortillas, and popcorn. It is a good source of carbohydrates, protein, and fiber.

Barley is a winter crop that is grown in the months of October to March. It is a major food crop in India and is grown in the states of Punjab, Haryana, Uttar Pradesh, and Rajasthan. Barley is a cereal grain that is used to make beer, malt, and barley bread. It is a good source of carbohydrates, protein, and fiber.

In conclusion, the main rabi crop in Himachal Pradesh is wheat.