I contacted Sequoia NP, and most trails in the park boundaries are open and accessible (for instance, they confirmed the Alta Peak trail is open). Same appears to be true for Yosemite (there is large section of park/trails closed south of the valley/Glacier Point, but most of of the trails up in Toulumne are open). The White Mountains are also open, and there is always Telescope over in Death Valley. Better than nothing...