Taking into account the fact that this little, red-breasted bird symbolizes the coming of spring for most North Americans, as a dream symbol it is associated with renewal, re-birth, growth and changes for the better. It is generally a good omen when populating your dream, as it stands for re-birth and announces development and happy times to come.
Also, we should not forget that the robin is one of the birds which sing since early morning until late in the night and its song is often mistaken for that of a nightingale. The beautiful trill of the robin heard in a dream foretells joy and good luck to come soon in the waking life of the person who has the dream.
On the other hand, if you see a wounded, dying or dead robin in your dreams, then you should be more careful about the decisions you take because periods dominated by bad luck may follow.