Cold weather
The winter of 1847-1848 was unusually cold. The pioneers were not prepared for the extreme cold and many of them suffered from frostbite and hypothermia. Some of the pioneers even died from exposure to the cold.
Food shortages
The pioneers had also not brought enough food with them to Utah. They were forced to rely on hunting and gathering for food. The winters were so cold, though, that the animals often hid in deep snow. The pioneers often went days without food and were forced to eat bark and roots to stay alive.
Disease
The cold and exposure also caused many pioneers to get sick. The most common diseases were scurvy, cholera, and smallpox. Scurvy is caused by a lack of vitamin C and cholera is a bacterial infection that causes severe diarrhea and dehydration. Smallpox is a highly contagious viral infection that can cause death. Many of the pioneers died from these diseases.
The first winter in Utah was a very difficult time for the Mormon pioneers. They faced many challenges, but they were able to overcome them and eventually establish a thriving community in the Salt Lake Valley.