Report Migrating Earthworms Worms "migrate" to the surface after the ground thaws. 1. Watch for earthworms 2. Report your observations Even though they only travel a few feet, earthworms undergo a "vertical" migration each spring after the ground thaws. The appearance of the first earthworms is a welcome sign of spring. It is often closely tied to the arrival of the first robins. Learn More! Read the description of earthworm migration as quoted from Edwin Way Teale's NORTH WITH THE SPRING. Also see these related links.   When you see your Earthworms, let us know! Report Your Observations Try a practice report any time. Also report these robin observations!   . Search Journey North Copyright 1997-2012 Journey North. All Rights Reserved. Questions or comments? Contact us.