I just returned from visiting my parents near Rocky Mtn National Park in =
Colorado. There are a tremendous number of hummingbird feeders (and =
hummingbirds) in the area. Since the rufous are migrating through the =
area this time of year, my parents asked if there is any reason to be =
concerned about keeping the feeders out too long and delaying the =
hummingbird's migration.

Does anyone care to comment on this topic?

Thanks,
Steve