The housing market doesn’t hibernate in the winter. Sellers who list and buyers who buy often find the winter season the most advantageous time to make a move in real estate, according to a new study by the real estate brokerage Redfin. The winter season officially takes place between Dec. 21 and March 20, and real estate professionals should be ready for a season that often brings in more focused and active sellers and buyers.  Winter Is Best Time to Sell, Study Shows.