I need suggestions for a fast growing tree for privacy.
Needs to be evergreen and hardy to zone 6
Would prefer something that hummingbirds or butterflies would like if possible

Just realized you said evergreen.......

Arborvitae are very good for privacy and birds absolutely love them. We've had many birds make nests in the arborvitae.

Some bamboo can tolerate low temperatures and you can't beat it for fast growth.

That was my thought. Timber Bamboo. My Mom grew it in Unionville, NV, Zone 4. It made a hedge between her and her neighbor in no time at all. I think the most important part for bamboo is to make a barrier (3 feet down or so) so it doesn't get away.

Daisy

Clumping bamboo does not spread wildly and can be controlled by cutting off any unwanted canes that appear. They will all emerge near the parent plant.

Thanks for the responses
I asked for a friend
She's not keen on the bamboo because she travels in her job and is worried it would spread too much while she's gone sometimes.

What about tall evergreen shrubs?
She has a neighbor is is watching every move they make as they remodel the property and house

Clumping bamboo will not spread as she imagines. It is the only evergreen I know that will grow really fast and form a dense hedge.

Come to think of it, my Mother's bamboo never spread. I made the mistake of growing Golden Bamboo.

Evergreen Holly bushes are another good one.

How about a Red Tip Photinia? It is not a tree but can be pruned into one. They have beautiful red and green evergreen leaves with white flowers in the spring. Fast growing. Can get to 15 ft.