Not entirely but my kids' K-8 has pushed some of their classes outside (mostly science) to their local "woods" (a part of the land parcel of the school that's not developed and has trees, a pond and some work tables). Also a lot of effort was done during the pandemic to do events outside (like music) in the quad area. Also all meals have been outdoors (indoor not possibly during pandemic) - I remember this being the case even when I was in school in this area.

Being in CA, that's easy year round due to milder weather.

That said, the effort was nothing close to outdoors all the time, which has significant challenges.