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Summerland Way is a 199–kilometre state route, designated B91, in New South Wales. It runs generally north from Grafton to the state border with Queensland just west of Mount Lindesay, and continues from there into Queensland as Mount Lindesay Highway. It was named as the region in runs through is a popular tourist area for people during summer. Summerland Way is an alternative route to Pacific Highway. It is sealed for its entire length, although some of the road north of Lions Road turn off is narrow and winding.

Summerland Way starts south of the Queensland border to Woodenbong, then heads in a southerly direction through Kyolge, Casino, and Whiporie to eventually reach Grafton on the Clarence River. Summerland Way crossed the river over the original Grafton Bridge, but now does so over the Balun Bindarray Bridge since its opening in 2019.

The passing of the Main Roads Act of 1924 through the Parliament of New South Wales provided for the declaration of Main Roads, roads partially funded by the State government through the Main Roads Board (later the Department of Main Roads, and eventually Transport for NSW). Great Northern Highway was declared (as Main Road No. 9) from near Woodenbong to the state border with Queensland (and continuing southwest via Tenterfield, Glen Innes, Tamworth, Singleton, Newcastle, Gosford, Peat's Ferry and Hornsby to North Sydney), to provide for additional declarations of State Highways and Trunk Roads, these were amended to State Highway 9 and Main Roads 140 and 151 on 8 April 1929. Great Northern Highway was renamed New England Highway through New South Wales on 14 March 1933 (continuing southwest via Tenterfield, Glen Innes, Tamworth and Singleton to Hexham). The southern end of Main Road 151 was later extended from South Grafton via Glenreagh to the jetty at Coffs Harbour on 16 March 1938. Trunk Road 83 was declared on 20 July 1949, from the intersection with New England Highway near Woodenbong, via Kyogle, Casino, Myrtle Creek and Grafton to the intersection with Gwydir Highway in South Grafton, subsuming Main Road 140 and the alignment of Main Road 151 between Casino and South Grafton; Main Road 151 was truncated at South Grafton as a result. New England Highway was re routed through Warwick and Cunninghams Gap in Queensland on 11 August 1954. Against the wishes of the Beaudesert Shire Council and the Woodenbong Chamber of Commerce, the former alignment of New England Highway from Tenterfield through Beaudesert to Brisbane was re declared Mount Lindesay Highway,

The New South Wales section of Mount Lindesay Highway, which still included unsealed portions, was eventually de gazetted as a highway by the Department of Main Roads on 23 December 1981 due to very low traffic volumes, it was renamed Mount Lindesay Road and re declared as Main Road 622. updated road classifications and the way they could be declared within New South Wales. Under this act, when Pacific Highway's Grafton bypass opened in May 2020, Summerland Way (as Main Road 83) was officially extended south along the old alignment of Pacific Highway on 5 July 2022, although the road is known locally and sign posted as Big River Way. Summerland Way today, as part of Main Road 83, still retains this declaration. In 1996, the Federal Government committed $20 million toward upgrading the Summerland Way. A $7 million contract to realign 1.2 km at Dourrigan's Gap, approximately 16 km north of Kyogle, was awarded, with work starting in February 2002 and expected to take 12 months to complete. Summerland Way was signed State Route 91 across its entire length in 1974. With the conversion to the newer alphanumeric system in 2013, this was replaced with route B91.

European settlement along the Clarence River had reached the area where Grafton now stands in the 1830s, with a store and shipyard being established at South Grafton in 1839. By the early 1840s there was a wharf, a store and an inn on the northern bank of the river. Prior to 1861, when a punt service began operating on the river, the only way to cross was by rowboat. A steam driven vehicular ferry began operating in the mid 1860s. In 1932, a bridge across the Clarence River with a unique design of two storeys with the railway running underneath the road, known as Grafton Bridge, was opened. In 1935 the Summerland Way was constructed between Casino and the recently completed highway. During World War II the road was improved as an inland, flood free route to Brisbane which avoided the problems associated with the Clarence River and its two ferry crossings. These industries made roads to where they worked, substantially contributing to the road network of the district. Road access from Casino was facilitated by the opening of the bridge at Casino in 1876. The road was the only means of travel to Casino until 1910, when the railway reached Kyogle.