Linked below are all the seasons of the Monogatari Series available as of now, in the watch order.
1) According to the novel order, Kizumonogatari comes after Bakemonogatari. However, production delays pushed it to before/after Koyomimonogatari(Movie 1 released before Koyomi, other 2 released after) Koyomi and so I’ll be putting it before Kizumonogatari as I feel it fits there better than after Bake. Feel free to use either order.
2) Hanamonogatari was after Kabukimonogatari in the novels. The anime however released Nekomonogatari:Shiro, Kabukimonogatari, Otorimonogatari, Onimonogatari and Koimonogatari as one part(Second Season) and Hana after it. That order makes more sense, since the events of Hana have nothing to do with any of the above arcs anyway so I’d recommend sticking to that.
3) Bakemonogatari’s 2 books, (3 arcs + 2 arcs) and Nisemonogatari’s 2 books(1 arc + 1 arc) were each combined into their own anime(with all the arcs together), while Owarimonogatari’s 3 books(3 arcs + 1 arc + 3 arcs) was split into 2 seasons(4 arcs+ 3 arcs). Second season mixed the 5 previously mentioned books(Nekomonogatari:Shiro, Kabukimonogatari, Otorimonogatari, Onimonogatari and Koimonogatari) into one season.
4) Koyomimonogatari was released before Owarimonogatari but the anime puts it between Kizumonogatari and Season 2(Last volume/3 arcs) of Owarimonogatari.
The only debatable part is point 1, for others just follow anime order.
For more detailed explanations of the order, refer these.
1. Bakemonogatari – 15 Episodes
2. Nisemonogatari – 11 Episodes
3. Nekomonogatari: Kuro – 4 Episodes
4. Monogatari Series: Second Season – 23* Episodes
5 Individual books/arcs combined into one season, individual episode counts are as below.
Nekomonogatari: Shiro – 5 Episodes
Kabukimonogatari – 4 Episodes
Otorimonogatari – 4 Episodes
Onimonogatari – 4 Episodes
Koimonogatari – 6 Episodes
5. Hanamonogatari – 5 Episodes
6. Tsukimonogatari – 4 Episodes
7. Owarimonogatari – 13* Episodes
The anime originally aired the first arc as a double episode(48 minutes long). The BD seems to have split that into 2 episodes, increasing the ep count from the orignal 12 to 13. MAL and other sites will still have the episode count as 12 so don’t be confused by the difference.
8. Kizumonogatari – 3 Movies
9. Koyomimonogatari – 12* Episodes
This was released as an ONA, not aired. 14 minute long episodes.
10. Owarimonogatari Season 2 – 7 Episodes
11. Zoku Owarimonogatari – 6* Episodes
Originally aired as a single movie, which is what MAL and other sites will have it as. The Blu-ray split the movie into 6 episodes of normal length so once again, don’t worry about the difference between here and MAL.