In the season that farmers have their crops off the fields there are the organised enduro's (competition) and the before mentioned off the roads. Those are real off road rides with little concrete (we have to do some road work though because there are too many roads
). Those start around september until new year, and than some in march I think.
http://www.enduro.nl/kalender.htmThere are enough rides, but travel is needed. (look on the map, most is on the east/south side of the netherlands.
Then there is the ''allroad'' rides. Some organised by ''us''. Those are more like friend rides than real organisation like the one above which are done by clubs and managed by the KNMV (Royal dutch motorsports association). All kinds of terain and level and very much depending on the weather the week before how hard they are. Also some with lugage and campings, some on roadbook, some on gps, or rides with a ''guide''.
North and south holland (provinces) are the most difficult places to ride. Around drenthe, brabant there is more space. Stay on the legal paths please.