Economists have told grain farmers to expect, at best, to break even with a good yield, and harsh weather could diminish farmers' harvests.
A Winter Weather Advisory and a Winter Storm Warning have been issued for southern Indiana.
Temperatures below zero could continue Thursday and Friday evening.
The Winter Storm Warning and Winter Weather Advisory will remain in effect from 10 p.m. Friday to 8 p.m. Saturday.
Forecasters at the National Weather Service say colder air will arrive Wednesday afternoon pushing wind chill temperatures to -24 degrees.
Bitter cold will be felt by a large portion of the U.S. east of the Rocky Mountains for the next few days.
Cooler temperatures and an increase in moisture created a healthier environment for fir trees.
A winter weather advisory is in effect until 9 a.m. Monday.
Freezing temperatures mean farmers can use equipment on their fields without worrying if the ground is too wet.
Temperatures will be in the 30s over the next couple of weeks, and snowfall is possible, according to the National Weather Service.