If you were organized enough in a prior fall, you could well have daffodils popping up around your entryway on their own. But even if you never got around to planting a welcoming swathe of daffs, The Netherlands Flower Bulb Information Center (NFBIC) says you can plant already blooming, potted bulbs outdoors in early spring.
One the soil has thawed and warmed a bit in mid-spring, you can plant store bought potted bulbs in your garden for an instant effect. Gently tap out the potted bulbs, trying to keep the roots and soil intact. Watering the soil before hand will help hold it all together and hopefully they will be pot bound enough to make an easy transition.
According to the NFBIC, "Given a day or two of acclimation to colder temperatures, even nursery grown plants can handle mid-spring weather if protected from the wind and extreme cold. Young bulb plants are designed by nature to handle tough early spring conditions."