Depends what you’re doing.
I went out for a 30 mile ride the other week in probably over 6 inches of fresh powder. Every mile felt like ten. My speed was averaging about 4mph and I stopped and pondered giving up several time. I did opt for the road near the half way point once I got out of civilization and from then on I really enjoyed it. It was a bit like riding on the moon. Or at least how I imagine it to be.
Everyone looked at me as if I was some kind of lunatic. Some laughed. And by the time I got back I felt like I’d done 100 miles. All in all it was challenging and enjoyable.
The next week after more snowfall I attempted another ride and with around a foot or so of fresh snow I couldn’t even move. Front wheel would dig in and the back just spun. I ended up walking a few feet before giving up.
It’s not the snow itself but rather what’s underneath it.
This is something you need to be careful about, especially off road. The snow may be flat, but you’ll find many hidden gifts underneath. I once fell face first into the snow while walking the dog when my leading leg sank waist deep…