Originally Posted by alan s

NPS says the Big Savage Tunnel on the GAP is closed from November through April, so you might have to take a detour. I rode the C&O in November a couple years ago and it was below freezing at night. Be prepared for 20s if camping. Not sure when they take the pump handles off at the hiker/biker sites, but in case they are off, you will need to bring your own water.