The (pious predecessors) used to make du’a’ for six months prior to Ramaḍān, asking Allāh to allow them to witness Ramaḍān.” (Laṭā’if al-Ma’ārif) 

As we enter Rabī ʾal-Awwal, there remains 6 months until the blessed month of Ramaḍān. With winter’s short days and long nights approaching, prepare for Ramaḍān by praying tahajjud and fasting. (Life with Allah)