The condition of the Top of the World in May will not reflect the condition of the highway later in the season. In May, crews will still be working to clear the snow from the highway rather than improving or regular maintenance. Some of the drifts up there are higher than a motorhome and take some work to get through.
Highway crews can't get over there until the ice breaks up on the Yukon River at Dawson City. This is sometimes early May, sometimes late May. Mostly in mid-May.
The border crossing opens when the crews have the highway clear enough for traffic.