This Tab is written by me, Tyler Rossow (P.S. This is my 1st Tab Submission) 

I haven't seen any good versions of this song so i'm going to put up my own tab. 
This version of "This is Halloween" is in Drop D.

Intro (0:00-0:12)
e|----------------------------------------------------|
B|----------------------------------------------------|
G|----------------------------------------------------|
D|-5--5--5--5-6--3--3--3--3-5--6--6--6--6-5--3----5-6-|
A|-5--5--5--5-6--3--3--3--3-5--6--6--6--6-5--3----5-6-|
D|-5--5--5--5-6--3--3--3--3-5--6--6--6--6-5--3----5-6-|

Verse 1 (0:12-0:23)
e|-------------------------------------------------------------------|
B|-------------------------------------------------------------------|
G|-------------------------------------------------------------------|
D|-5--5--5--5--5-6-5-3---3--3--3--3--3-5-6-5---5--5--5--6-6/8--6-5---|
A|-------------------------------------------------------------------|
D|-------------------------------------------------------------------|

D|-3--3--3--3-5-6-5--1---1---|
A|---------------------------|
D|---------------------------|

Chorus (0:23-0:35)                                  (x2)
e|---------------------------------------------------|
B|---------------------------------------------------|
G|---------------------------------------------------|
D|-4--4--4-3-1---4--4--4-3-1---4---------------------|
A|--------------------------------3-3-3--------3-4---|
D|--------------------------------------8-6-5--------|

Verse 2 (0:35-0:51)
e|------------------------------------------------------------------------|
B|--------------------------------------------------------7-6---5-3-2-3-5-|
G|--------------------------------------7-6--5-3-2-3-5-6------------------|
D|-6-6-6-6-7--6-6-6-6-7--6-5-3-2-3-5-6------------------------------------|
A|------------------------------------------------------------------------|
D|------------------------------------------------------------------------|

Chorus (0:51-1:09)                                  (x2)
e|---------------------------------------------------|
B|---------------------------------------------------|
G|---------------------------------------------------|
D|-4--4--4-3-1---4--4--4-3-1---4---------------------|
A|--------------------------------3-3-3--------3-4---|
D|--------------------------------------8-6-5--------|

These are like the only riffs in the song so from here on out just listen to
the song and figure out what parts go where on your own.