Park officials say nearly all of Lower Pines and part of North Pines Campgrounds are reopening.
No update has been provided about Housekeeping Camp.
Portions of Yosemite Valley were flooded earlier this month when snowmelt caused the fast-moving Merced River to raise, going over its banks in some areas.
As of Thursday morning, the river's level at the Pohono Bridge stands at just over 10 feet -- which remains in minor flood stage.