Thai masam is the 10th month in a traditional calendar followed in Tamil Nadu. Thai Month 2025 begins on January 14 and ends on February 12. The most auspicious days and festivals in the month include – Thai Pongal , Mattu Pongal, Kaanum, Thai Amavasya and Thaipusam. Pournami and Amavasai Pournami or full moon in Thai month is on February 12 Thai Amavasai is January 29. Festival dates in Thai month 2024 Pongal – January 14 Mattu Pongal – January 15 Kaanum – January 16 Ratha Saptami - February 4 Thai Karthigai  – February 6 Thaipusam – February 11 Ekadasi January 25 and February 8. Muruga Sashti Fasting February 3 Pradosham January 27 and February 9 Pillayar Chaturthi Vrat - Ganesh Sankashti Chaturthi Vrat is on January 17, 2025.