Yes, snow is blanketing Spring Mountain.
The extensively wet heavy snow brought down an enormous amount of trees and limbs, which were weakened by the 2020 Glass Fire.
The snow and downed trees have clogged Spring Mountain Road from beginning to end. Napa County is working on clearing the road.
Here are reference websites to check before trying to go up Spring Mountain Road:
Napa County Emergency Services
Map of Road Closures
Local Weather Updates (which is localized from https://www.weather.gov/).
Many wineries are sharing their snowscapes and updates on their social media channels!
If you have a visit scheduled to a winery in the Spring Mountain District, please try to call them before heading out.
Be safe and stay warm!