Vasant Panchami is celebrated during the *Shishir* season because it marks the onset of spring, rather than the entire spring season itself.
According to the traditional six-season cycle of the Hindu calendar:
❀ *Shishir* season = Months of Magh and Phalguna
❀ *Vasant* season =
Chaitra Maas and Vaishakha
❀ Vasant Panchami falls on *Magh Shukla Panchami*, which falls within the *Shishir* season.
Why is it called "Vasant" Panchami?
❀ By Magh Shukla Panchami, the chill of winter begins to subside.
❀ Days start becoming longer and warmer.
❀ Yellow flowers begin to bloom in mustard fields.
❀ New buds and leaves start appearing on trees.
❀ Early signs of the approaching spring begin to appear in nature.
Therefore, ancient sages regarded this day as the harbinger of spring. It heralds the arrival of spring, even though the *Shishir* season (late winter) is technically still underway according to the calendar.
There is a traditional saying that Vasant Panchami marks the onset of spring's influence, whereas the spring season officially begins later, with the month of Chaitra.
Thus,
Vasant Panchami falls during the *Shishir* season because it is a celebration of the approaching spring, not because spring has fully commenced according to the seasonal calendar.