I’ve been to Clingman’s Dome in January and the road was closed. You can drive to Newfound Gap though. I believe that GSMNP usually posts road closings on their website:
http://www.nps.gov/grsm/planyourvisit/temproadclose.htm
And after checking it out, you are right that the road to Clingman’s Dome is closed after Thanksgiving….
Seasonal road opening and closing dates are listed below. Click for information about temporary weather and construction related road closures.
Balsam Mountain
Closed for the winter. Will reopen May 9, 2008.
Buses, RVs and motorhomes prohibited on the road.
Cades Cove Loop Road
Open all year from sunrise until sunset
This road will be closed to motor vehicles on Wednesday and Saturday mornings until 10:00 a.m. from May 9 through September 26, 2007 to allow bicyclists and pedestrians to enjoy the cove.
Clingmans Dome
Open April 1 – November 30, 2007
Heintooga Ridge Road
Closed for the winter. Will reopen May 9, 2008.
Buses, RVs and motorhomes are prohibited on this road.
Little Greenbrier
Open March 9 – December 31, 2007
Parson Branch
Closed for the winter. Will reopen March 7, 2008.
Buses, RVs and motorhomes are prohibited on this road.
Rich Mountain
Closed for the winter. Will reopen March 7, 2008.
Buses, RVs and motorhomes are prohibited on this road.
Roaring Fork
Open March 9 – November 30, 2007
Buses, RVs and motorhomes are prohibited on this road.
Roundbottom/Straight Fork
Closed for the winter. Will reopen March 7, 2008.