Firstly I know that this song is not strictly Bon Iver, it is Justin Vernon when he did 
solo project, you can find the song on youtube.

This is my first tab and is only a very rough guide I'm afraid,
When strumming play only the first 3 bass notes for first few strums before striking the 
for that twangy sound he gets (I hope that make sense) listen to the song and hopefully 
understand.

Intro
E                C#m


E         C#m
 Lay low little babe
E                C#m
 You're still my precious child
E                C#m
 You're all old and grown now
E                C#m
But you're still the same inside

A           C#m
  Standin' on the whippgrass
  Standin' on the whippgrass
  Sittin' on the whippgrass
Ab
  Watch and see how we last

E                C#m
 You're not alone tonight, babe
E                C#m
 You're not so far from your home
E                C#m
 You got the strength of all us, babe
E                C#m
 I give a prayer unknown(?)

A           C#m
Sittin' on the whippgrass
Sittin' on the whippgrass
Just sittin' on the whippgrass
Ab
I'm so full
and this is so vast

E                C#m

E                C#m
 I know we'll all be together, babe
E                C#m
 Someday, somehow
E                C#m
 Carry to a higher bound, babe
E                C#m
 It's not a sight or a sound

E                C#m
 Smokin' around
E                C#m
It's within me somehow
E                C#m
I'll carry to what I am bound
E                C#m
The truth that I have found

A           C#m
Standin' on the whippgrass
It moves along the whippgrass
It moves along the whippgrass
It moves along the whippgrass
It moves along the whippgrass
It moves along the whippgrass
Ab
See how it lasts