There are 2 possible watching orders:
Release Order (Recommended)
Name Place in chronological order Status Bakemonogatari (2009) 3 Completed (15/15) Nisemonogatari (2012) 4 Completed (11/11) Nekomonogatari: Kuro (2013) 2 Completed (4/4) Monogatari Series 2nd Season (2014) 5 Completed (23/23 + 3 Recap episodes) Hanamonogatari (2014) 8 Completed (5/5) Tsukimonogatari (2014) 6 Completed (4/4) Owarimonogatari (2015) 7 Airing (9/12) Kizumonogatari (January 2016; subs ~July) 1 Not yet aired (0/3 Movies)
Chronological Order
Name Status Kizumonogatari (January 2016; subs ~July) Not yet aired (0/3 Movies) Nekomonogatari: Kuro (2013) Completed (4/4) Bakemonogatari (2009) Completed (15/15) Nisemonogatari (2012) Completed (11/11) Monogatari Series 2nd Season (2014) Completed (23/23 + 3 Recap episodes) Tsukimonogatari (2014) Completed (4/4) Owarimonogatari (2015) Airing (9/12) Hanamonogatari (2014) Completed (5/5)
Total: 74 episodes + 3 recap episode + 3 movies