National Party regional chairman Malcolm Plimmer said the party was satisfied with the selection of Mr Scott but it would not be relying on its past successes in the Wairarapa
"We'll be taking nothing for granted in Wairarapa. Alastair is an outstanding candidate who will be a strong advocate for Wairarapa."
Mr Scott said his focus will be on trying to hold National's position in Wairarapa after incumbent MP, National's John Hayes, retired this year.
Mr Hayes had a 7000 majority last election.
"There are just five short months until the election, and I'll be working hard to keep Wairarapa's strong voice in John Key's National Party on September 20," Mr Scott said.
The retirement of Mr Hayes left Mr Scott to vie for the position against three others - Jo Hayes, James Perry and Richard Townley.
Mr Scott said he will be campaigning in the community immediately.
"I'll be getting out and about to engage with communities about National's plan to keep working for New Zealand. "National is making real progress for regions likes ours. Wairarapa communities are benefitting from lower crime, better services in health, and ongoing investment in infrastructure."
Mr Scott will be up against Labour Party's Kieran McAnulty and Green Party's John Hart.
He is a father of three and lives between homes in Masterton and Wellington with partner Robyn Noble-Campbell and their blended family.