Hummingbird Migration Map
The first sightings of Hummingbirds, in my area of Minnesota, coincide with Hosta eyes starting to pop up. So, I like to watch the Hummingbird migration progession on a map at this site:
When the Hummingbirds arrive, I know the Hostas will soon follow.
Hope you enjoy the site,
Here is a link that might be useful: Hummingbird Migration Map