While Featherston crews tackled the fire's western edge, Lake Ferry firefighters Jakob Florence and Jarred Pead carried a pack with a hose extension to try to get around to the heaviest blaze, which was advancing along the spit.
Carterton fire station's water tanker arrived to provide assistance, followed by Tora Rural Fire Force.
It took about two hours to halt the fire, but rural crews had to remain until 11am on Saturday to extinguish hot spots.
Lake Ferry firefighters' efforts to get closer to the fire caused their vehicle to get bogged down in shingle.
A digger was called in to help tug them free.
Featherston fire chief Colin McKenna said they were "pretty sure" someone had left a fire going on the beach.