When do I put out humming bird feeders?

Today sounds as good as any

Now

Today. It'll take them a few days to realize there's a new spot to feed. But once they realize it, you'll have a group of the same ones that keep coming back to it.

quote:

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Now they've been in my yard about a month

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Same here.

Today

And don't bother buying that red "nectar" crap at the stores, just use a simple sugar solution: 4 parts water to 1 part white sugar