Tea is the most popular non-alcoholic beverage in the world well known for its refreshing and stimulative properties. Temi tea is a top-notch organic tea brand being grown in the sole tea estate in the mountainous state of Sikkim which has high demand in the international market and has not been studied scientifically so far. Therefore, the present study was conducted to assess and compare the total polyphenol content, total flavonoid content, total tannin content and antioxidant activity in the processed Temi tea samples collected across different season (flush) which is expressed on dry weight basis. Total polyphenols, flavonoid, tannin and antioxidant activity were studied spectrophotometrically. Results of the analysis revealed that the highest total polyphenol content, highest flavonoid content and highest antioxidant activity was found in T1 (Green tea sample of Spring flush) while the highest total tannin content was found in (T2) Black tea (Spring flush).