March is "Fall of the Mutants" month! And the first appearance of Excalibur, though its regular series won't launch for a few more months.
But first, one quick change to February's schedule: I'm swapping Incredible Hulk #340 and New Mutants #59, so we'll be looking at the former this week and the latter next week instead of vice versa.
With both X-Men and X-Factor shipping two issues in September '87 to New Mutants' one, New Mutants #59 could go either this week or next, but it makes the most sense to cover the first parts of each series' respective "Fall of the Mutants" contributions in the same week (I'm not even sure why I didn't schedule it that way in the first place).
On Sale September 1987
March 5th: Uncanny X-Men #225
March 6th: New Mutants #59
March 7th: X-Factor #24
On Sale October 1987
March 12th: Uncanny X-Men #226
March 13th: New Mutants #60
March 14th: X-Factor #25
On Sale November 1987
March 19th: Uncanny X-Men #227
March 20th: New Mutants #61
March 21st: X-Factor #26
On Sale October/November/December 1987
March 26th: Captain America #339 & Daredevil #252 ("Fall of the Mutants" tie-ins)
March 27th: Power Pack #35 & Fantastic Four #312 ("Fall of the Mutants" tie-ins)
March 28th: Excalibur Special Edition #1