Answer: Bare daffodil bulbs should be planted in the fall when the soil temperature cools down, usually some time in October. In the fall they become rooted, and then grow up out of the ground and bloom the following spring. They must have several months of chilling in order to root and then to bloom, so planting now probably is just too late. But, the alternative is to throw them away so I would go ahead and plant them. They most likely will not bloom this year and may not bloom next year due to being so far off schedule. Or, maybe you could return them? It would be much better to buy freshly dug bulbs in the fall and plant them at the right time of year.
There is also the chance that you bought "pre-chilled" bulbs. If this is the case, absolutely go ahead and plant them now and they should be fine.
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