In keeping with the January sales tradition, the "late, late" sale saw prices slashed in the shop at the National Trust property.
For the first time in a month, the Hall galleries, featuring more than 100 18th-century portraits and seven interpretation galleries were also open.
Those works are displayed as a result of a partnership with the National Portrait Gallery.
In addition, families visiting the property over the weekend made the most of an opportunity to take part in Artrageous art workshops.
Jacquelyn Crofts, visitor services manager at the Georgian mansion, said: "We are delighted to finally open the doors for 2010, the property looks lovely and it gives our visitors the opportunity to get outdoors and enjoy this beautiful time of year."
The mansion, which had been closed since 20 December because of the weather, will be now be open to visitors every weekend, offering cycling, guided tours, country walks along the River Ouse and a walk through Pike Pond Woods.
The Hall, which was built in 1716, is renowned for its impressive baroque interior.