From Sahih Bukhari (Hadith 1999):
Narrated Ibn `Umar:Fasting for those who perform ,Hajj-at-Tamattu` (in lieu of the Hadi which they cannot afford) may be performed up to the day of `Arafat. And if one does not get a Hadi and has not fasted (before the `Id) then one should fast of the days of Mina. (11th, 12th and 13th of Dhul Hijjah)
Reference: Bukhari 1999