
I live in Central Texas in the middle of zone 8. The average last frost occurs the first week of March; the average first frost occurs the third week of November. That sounds like I should have an eight month growing season, but I really have two growing seasons separated by devastating heat.
In a "normal" year rainfall should be 32.5 inches, falling mainly April through June, and Sept. through Nov. Our low winter temperature will be mid-teens, and our highest summer temperature will be 100° to 105°. However, we don't get many mid-teen mornings, and those occur usually in Jan. We rarely get snow; more often it's sleet or freezing rain. Most of our wildflower seeds germinate with the fall rains, and overwinter hugging the ground. They are ready to flower and set seed before the summer heat begins.
There are many spring flowers that are best started in fall in the south. Pansies for sure, but also snapdragons, stocks, calendula, sweet alyssum, china pinks and sweet William, larkspur, and Iceland poppy. They are all frost tolerant in my area, and many are available as transplants from the nursery. Not all of these winter annuals bloom during the winter, but they will provide spring bloom as soon as the weather moderates.
Ipheion uniflorum (picture above) is a low-growing, spring-blooming bulb that produces leaves in fall when the rains return. The blooms are six-petaled, blue with lighter centers, with the common name of Spring Starflower. They prefer a dry summer, and so are perfect for this area. The also stand some shade. My mother always planted ranunculas during the winter even though they are only half-hardy. The bulbs would sprout and stay small, then grow quickly and bloom in spring. She would dig them up after the foliage withered and store the tubers inside till the following winter.