Springtime is the time to plant annuals, but fall is the best time to plant perennials, shrubs, and trees as I explained earlier.
Today, spring bulbs. You do not want to plant them until nights are regularly below 50 degrees F or the bulbs will either rot or try to send up shoots.
However, early enough to get some roots into the soil.
Basic design tip: Bulbs should be massed
Growing Guide Narcissus (Daffodils)
Time to Plant Tulips and Daffodils