A map of groomed cross-country ski venues in the United States — … of them in … states — with their trails, the snow on the ground, and the snow in the forecast.
Every venue here can be checked against one of those public sources. A place we can’t verify that way isn’t listed yet — which is why one you know may be missing.
km of mapped trail is measured from OpenStreetMap. km of trail is the figure the venue gives itself, used where the two disagree. A solid dot has its trails mapped — click it to see them. A hollow ring is a venue confirmed from its own website whose trails aren’t mapped yet. Always check the venue’s own site for conditions before you go.