What do the colors of the Winds Aloft barbs mean?

The color of winds aloft barbs indicates the speed range for the forecast winds aloft at that location and the altitude indicated on the altitude slider. Please see image 1 below for the legend.

You can also refer to either the ForeFlight Mobile Pilot’s Guide or the ForeFlight Mobile Legends Guide. Both can be found within ForeFlight Mobile under Documents > Catalog > ForeFlight.

Image 1:  Winds aloft color legend.