The weather in Arkansas is extremely crazy. One day you have breaking temps, and the next you get lows during the winter time. This is makes it hard to garden in zone 7b or 7a depending on which hardiness zone map you look at.
Using greenhouses can help with this if you have know what your doing. Seedlings need a nice constant temperature and light. Heating mats and grow lights can help with this process.
If you know the weather and pick the right time to plant your baby plants in the ground outside will give you the best chance for a bumper crop and harvest.
Here are some resources for Arkansas Weather.