When do you stop feeding hummingbirds?
In the Midwest, I stop feeding the hummingbirds about Thanksgiving. You can tell when they slow up coming and when the nectar isn't being used.
It depends on where you live. In the Nashville Tennessee area, we stop feeding around the first week of September so that they will migrate, as the winter is too cold here for them.
Usually, the rule is: when the flowers they naturally eat die out then remove the feeders. They like the rose of Sharon trees and lillies and momossia (not spelled right), but it is the tree that has leaves like ferns and bright pink fuzzy flowers on it.