To promote the release of Mockingjay, many bookstores held midnight release parties. The official event in New York City was attended by Collins, and included many activities such as a tarot card reader, a magician, jugglers and face-painters. Prizes such as signed copies of Catching Fire and Hunger Games-themed cups were raffled. Once Collins arrived, she read the first chapter of the novel, explaining that she would read with an accent since Katniss, the narrator, is from Appalachia. By midnight, copies were being sold with a signature stamp since Collins had a hand injury and was unable to sign.
Before the release, Scholastic also released a trailer for the book, launched a Facebook page that gained over 22,000 fans in 10 days, and held a contest for booksellers to win a visit from Collins and an online countdown clock to the release date. There were also advertisements for the book on websites such as Entertainment Weekly and Romantic Times. National Entertainment Collectibles Association also sold other goods such as T-shirts, posters, games and bracelets. Collins also held a "13-District Blog Tour" where 13 winners received a free copy of Mockingjay on August 24, 2010. A tour was also scheduled, starting at Books of Wonder in New York where the official party took place. The tour ended on November 6, 2010, in the Third Place Books store in Lake Forest Park, Washington.
Mockingjay has received generally positive reviews from critics. Some noted that there was a suspense drop between Catching Fire and the start of Mockingjay. Nicole Sperling of Entertainment Weekly gave the book a B+ and said, "Collins has kicked the brutal violence up a notch in an edge-of-your-seat plot". Publishers Weekly gave the book a starred review, calling it "the best yet, a beautifully orchestrated and intelligent novel that succeeds on every level". The review went on to praise the "sharp social commentary and the nifty world building". Kirkus Reviews gave Mockingjay a starred review, saying that the book is exactly what its fans are looking for and that "it will grab them and not let go". Susan Carpenter of the Los Angeles Times compared the battlefield to Iraq and said that the book is every bit as original as the first in the series, ending the review with "Wow".
The Baltimore Sun 's Nancy Knight commented that the book "ends on an ostensibly happy note, but the heartbreaking effects of war and loss aren't sugar-coated" and that it will have readers thinking about the effects of war on society. Katie Roiphe of The New York Times said it is "the perfect teenage story with its exquisitely refined rage against the cruel and arbitrary power of the adult world". However, she criticized that it was not as "impeccably plotted" as The Hunger Games. Bob Minzesheimer of USA Today gave the book three out of four stars. The Christian Science Monitor reviewer Yvonne Zipp described it as "an entirely gripping read".
While a review from The Sacramento Bee praised the action scenes and the battle in the Capitol, the reviewer also criticized Collins for not giving enough time to finish all the loose ends, writing that "the disappointment with Mockingjay hits primarily as Collins starts her home stretch. It's almost as if she didn't allocate enough time or chapters to handle all her threads".