There are a few tabs out there for this and some are decent but this is the way I 
learned it by ear. 

Autumn
by Haste The Day
Dreamer

Tabbed by Bluedeuce19k

Tuning: Down 1/2 Step

Freely: (Listen to the song for the feel)

Verse1:4x
eb|----0-------0--------0------------------0-----0------0-------------------|
Bb|----0-------0--------0------------------0-----0------0-------------------|
Gb|----0-------0--------0------------------0-----0------0-------------------|
Db|----9-------5--------4-----------------/7-----5------2--------------/4---|
Ab|----10------7--------5-----------------/9-----7------3--------------/5---|
Eb|---(0)--------------(0)-----------------------------(0)------------------|
      Red     Leaves   Blow___             In    The   Wind_______
      Leaving Home and Everything it's    Known  Be    Hind_______
      Barren  Branches Wave___             Good  Bye______________
      As    The      Red Leaves__          Slow- ly    Die________


Chorus: ( He sings a little more loosely on the 2nd run through )
eb|-----0------0---------0----------------0------0--------------------------|
Bb|-----0------0---------0----------------0------0--------------------------|
Gb|-----0------0---------7-------------(4)5------5--------------------------|
Db|-----9------5---------5----------------7------5--------------------------|
Ab|-----10-----7---------0----------------0------3--------------------------|
Eb|-------------------------------------------------------------------------|
              Every   Flower Stares and Watches___________________
       as the wind     it takes     me a------way
              before the sun shone  upon me
      oh    now the      wind    takes  me away


A couple of tips:
Close as I can get it. This is how I play it and it sounds fine.