Fall is THE time to plant bulbs like Daffodils, Tulips, Crocus, Hyacinth, and many other spring-bloomers.
Many people also ask about summer-blooming bulbs, such as Dahlias, Lilies, and Gladiolus. Those varieties become available in the spring for planting.
Bulbs get planted the season or so prior to their bloom-time. Or, another easy way is just to come to the nursery in the fall and the spring and we will have exactly what you need at the correct time =)