Most of the day is outdoors. Larchwood Cabin and a booked castle tour offer some shelter, but Drumlanrig is still a poor wet-weather choice for a full day. Expect pea gravel, grass and steep sections in the gardens; woodland paths can be hard work with a buggy, wheelchair or mobility scooter.
The castle has a lift, but buggies cannot go through the rooms; leave them at reception. Accessible parking at Larchwood is first come, first served. By public transport, the bus leaves you at the estate entrance, around a 1.5-mile walk from the castle, so check the current journey before travelling.