When to submit your application depends on a couple of things.  But generally, we say, "Why not submit it now?"  Applying to Wesleyan is the easiest part.  You can do that online.

Early Decision Applicants
If Wesleyan is your clear first choice, you’ll want to apply under Early Decision. Early Decision is a binding decision. Applications (and all supporting documents) must be received by November 15. You’ll hear from us by December 15; if admitted, you’ll be required to withdraw applications from all other schools, and pay your enrollment and housing deposit by January 7.

Regular Decision/Scholarship Priority applications and supporting documents must be received by January 15. You’ll hear by February 15, and will have until the national reply date of May 1 to pay your enrollment and housing deposit.

Regular Decision/Scholarship Priority Applicants
Regular Decision/Scholarship Priority applications and supporting documents must be received by January 15. Applicants meeting this deadline will have first consideration for Wesleyan’s merit scholarships. You’ll hear by February 15, and will have until the national reply date of May 1 to pay your enrollment and housing deposit.