Looks like they are currently in mountains of Montana.
ES is just south of Butte, heading towards the Pioneer Mountains Scenic Byway and the 26 mile (paved) slog to the nearly 8,000' summit.
According to the U.S.F.S., the byway is closed due to the effects of the storm:
"The Pioneer Mountains Scenic Byway continues to remain impassable to through traffic due to significant snow remaining at higher elevations. Beaverhead County officials are monitoring the snow depth and predict that they should be able to plow open the Pioneer Scenic Byway near mid-June. " Until the Byway is opened, travelers in the area are advised to be cautious of changing road conditions and respect the road closures. To become stuck in a snowbank puts you and someone that might be willing to help you at risk for personal injuries as well as damage to your vehicle.
"Upon opening the Byway, County crews will resume reconstruction of the roadway in the Moose Park Area. Motorists can expect to encounter delays during the reconstruction, including some possible short term road closures to expedite the work."
JC is behind in Lincoln.