Yellowstone is open and all 179 employees tested negative for COVID-19 during the second round of tests.
Yosemite requires reservations to visit and has pushed campground reopens up to August 1.
Zion is open but with there's no shuttle service so parking is very limited.
Rocky Mountain continues with timed entry.
Acadia (i.e. State of Maine) requires a 14-day quarantine for all non-exempt out-of-state visitors.
Here's the latest list of what's open, what's closed and what's changed.
P.S. Chimani Perks subscribers are receiving these updates daily for each park under the "COVID-19 Impacts" section.