I've created this web page to provide a resource for would be skijorers. Send me information on places to skijor, and other information of skijoring interest, and I'll post it here. Wherever you go, remember to keep your path clean. On a marginally related note, I should like to make a plea for old-style cross country skiing. This requires single track, machine-free, narrow trails that thread their way through forest and hills.
Equipment is simple, skis are relatively wide, waxing is elementary, and clothing is eclectic.
This is the skiing I fell in love with twenty years ago. Directions not guaranteed. Alas, many of these places require us to watch out for snowmobiles. Horse trails may be suited to skijoring if they're horse-free. Remember, wherever you skijor, to watch out for others.