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Arnside Tower was built in the second half of the 15th century. Tower houses were built throughout the border regions of northern England and southern Scotland because of the threat posed by Border Reivers. Constructed of limestone rubble, the tower was originally five storeys high, measuring 50 feet by 34 feet. The tower was built with an adjacent wing of equal height built onto the side of the tower in a style common in Scotland, but rare in English tower houses. Historian Anthony Emery suggests that the design may have been influenced by that at Ashby de la Zouch Castle, rebuilt in 1464 by Lord Hastings. The tower suffered a serious fire in 1602 but after repairs remained in use; the historian Anthony Emery states that the tower was in use until the end of the 17th century, but the historian Roy Palmer states that William Coward and his sister Agnes Wheeler lived there at the end of the 18th century.
One of the walls of the tower collapsed around 1900, and as of 2014, English Heritage considered the condition of the castle to be very bad and urgent works are required. Arnside Tower is a Scheduled Monument and Grade II* listed building.
The tower is in private ownership and is in a ruinous state. The local tourist board recommends that good views of the tower can be made from the public footpath which runs alongside. 
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- Grade II* listed buildings in South Lakeland
- Listed buildings in Arnside
- Castles in Great Britain and Ireland
- List of castles in England
- Emery, p.183.
- Pettifer, p.265.
- Emery, p.184.
- Emery, p.184; Roy Palmer, ‘Wheeler , Agnes (bap. 1734, d. 1804)’, Oxford Dictionary of National Biography, Oxford University Press, 2004 accessed 1 June 2017
- Heritage at Risk Register 2014 North West, English Heritage, p. 36, archived from the original on 23 September 2015, retrieved 23 September 2015
- Heritage at Risk Register 2014, p.36.
- Historic England, "Arnside Tower (1007142)", National Heritage List for England, retrieved 20 December 2016
- Historic England, "Arnside Tower (1312275)", National Heritage List for England, retrieved 20 December 2016
- "Arnside – Arnside Tower". visitcumbria.com. Retrieved 23 September 2015.
- Emery, Anthony. (1996) Greater Medieval Houses of England and Wales, 1300-1500: Northern England. Cambridge: Cambridge University Press. ISBN 978-0-521-49723-7.
- Pettifer, Adrian. (2002) English Castles: a Guide by Counties. Woodbridge, UK: Boydell Press. ISBN 978-0-85115-782-5.
- Drone video of the tower showing exterior and interior of the remains