There is no need to add red food color. Be sure to change the solution in the feeder every three days or it may spoil. Hummingbirds migrate north as the weather warms and arrive here from mid to late April when they breed. Gardens with wooded shrubby areas may actually entice some nesting hummingbirds. They begin migrating south for the winter from mid-August through early October.
Some ruby throats fly across the Gulf of Mexico to get to winter homes in Central America.
Contrary to popular belief, feeders will not keep hummingbirds from migrating south. It just means they can fuel up on the way.