How early should I book hotels in North-Eastern Mediterranean?

How early should I book hotels in North-Eastern Mediterranean? - Cute schoolchild doing homework with help of tutor

We want to go to North-Eastern Mediterranean (Greece, Croatia, maybe Montenegro) next August. We would like to book hotels in advance, to get better prices and wider choice. However, it is obvious that booking, for example, now is too early. When it is optimal time to book hotels in advance?

bookings hotels greece croatia montenegro

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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Gustavo Fring, Lum3n, Ann H, Ena Marinkovic