I actually had someone contact me in January of this year and someone else do so in March. In both cases, they were worried mothers who had no experience with Greek life and had heard about "these rec letter things." Those were more informational calls -- I told them to see me in June.
Anyway, I always have a couple come sliding in at the 11th hour. I had a BAMA girl last year -- I and some other sorority alums in our community shoved her recs in through the cat door, it was so late in the game. She only had a handful of recs going in (scary at BAMA). She ended up pledging one of the sororities she did have a rec for and is very happy, so all's well that ends well -- but that was risky business waiting that late and going in with just a few.
I'll look forward to hearing everyone's results in August and September!