The US summer ski area above Timberline in Oregon, not quite a glacier but designated a permanent snowfield, has opened for 2023, served by the resort's Palmer chairlift. Other parts of the ski area remain open with an 11 foot snow depth, there are also four terrain parks currently available.
Palmer is often the only ski area open for most of North America's summer but this year at least two other area, California's Mammoth Mountain and Palisades, will be open through July and possibly longer, thanks to the huge snowpacks there. Along with recreational skiers, the snowfield is used for race team training in the early morning.
About a dozen other US and Canadian ski areas are currently still open but most will close after this weekend or the one after. The only other are that's confirmed it will stay open into June is Colorado's Arapahoe Basin.
The summer-only Beartooth Basin ski area in the Montana/Wyoming border will also open from June 26th and is open to all.
Lifts are or also running into June and serving snow areas at Copper Mountain in Colorado and the Horstman Glacier on Blackcomb Mountain at Whistler in Canada but both only for people who have signed up to camps.