Gary said we'll know for sure in 3 months if the rapture is really in 2006 and Fall season.
 
I have found that the scriptures are very detailed about what season and what exact Feast day the rapture happens on...and even what type of year the rapture can happen in and which ones it cannot.
 
So it's my opinion that you really do not have to wait 3 months to know for sure if the rapture is spring or fall or 2006 or not.  However, on the question of Spring or Fall I will warn that which you can fit with your theology (right or wrong) largely comes down to a matter of whether you believe in a pretrib or posttrib timing, respectively.
 
See these articles for answers:
 
Which Year?
http://www.escapeallthesethings.com/rapture-year-timeline.htm
 
Which Day/Season?
http://www.escapeallthesethings.com/days-noah-one-taken-left.htm
http://www.escapeallthesethings.com/no-man-knows-the-day-or-hour.htm
 
Tim