I didn't look for this until last night when it was already too late to jump in between Utahtea and Donna and pick May 21, the Thursday before Memorial Day. While I think the week following Memorial Day would also be a good guess,
I'm going with June 1st at 9 AM. I think they could have it open earlier this year, like by next Friday May 15, but I'm picking June 1 since Yosemite is still closed and California, who controls access from the East, is probably under stay-at-home order through May 31.
Surprisingly, Monitor and Ebbetts passes are both still closed although Ebbetts looked mostly snowfree at 8,730' summit on April 27. See pictures and story posted at
https://californiaalpscycling.bike/2...action-report/ on May 2. Monitor is lower and farther E so it gets less snow.