Happy NaNoWriMo and Preptober!! Are you planning on doing NaNoWriMo this year? That's great! Not sure what NaNoWriMor is or Preptober? Let me explain. NaNoWriMo stands for National Novel Writing Month which started in 1999 as a challenge to write 50,000 words for a novel in 30 days. Starting on the 1st of November and ends on the 30th of November.