Hardiness Zone Confusion...

While daydreaming about what fruit trees I want to plant this coming spring, I jumped on the Internet  to find out what hardiness zone I reside in.  Not what I expected...  I checked five different sites, all of which ask you to type in your zip code to determine your particular "zone."  Guess what?  Out of five sites, I got four DIFFERENT answers!  Given the information, I decided I would go with Zone 6, just to be safe.  My zip code is 44491.  Check it out yourself and see what your zone is... I hope you have better luck at getting a more concrete answer than I did. 

http://planthardiness.ars.usda.gov/PHZMWeb/  Zone 6a

http://www.garden.org/zipzone/  Zone 5a

http://www.gardenweb.com/zones/zip.cgi  Zone 5

http://www2.arborday.org/treeinfo/ZoneInfo.cfm?ZipCode=44491&submit=Look+it+up%21 
Zone 6

http://www.burpee.com/gardening/content/gygg/growing-zone-information/growingzoneinfo.html

and that last one came up with Zone 5...