If you see tulips and daffodils blooming in your neighbor's yard next spring and want some in your own yard, its too late to plant them then.
Spring flowering bulbs go in the ground now, in the fall.
While soil temperatures are still warm is the time to buy and plant bulbs. The safest time is now through October. I have planted bulbs as late as November, but you risk sparse root development that will affect flowering in future years. When selecting bulbs always buy the largest size bulb you can afford. Unless you are naturalizing with bulbs, bigger is better.