The Four Seasons is no longer taking bookings or offering discounts from February, if you now try to book you get this message.
Source: https://reservations.fourseasons.com/plan-your-stay?hotelCode=STS674&checkIn=2021-02-26&checkOut=2021-02-27&adults=2&children=0&promoCode=Four Seasons Resort and Residences Napa Valley will be opening in the spring of 2021. To enquire about availability, please call Worldwide Reservations for assistance.