Event organiser Phil Clode said numbers for this year's 10th anniversary event were down on last year. But he said the Ekiden was competing with other events around the country this weekend, including the national road relay in Nelson and a new Hamilton half-marathon.
Mr Clode said about 1100 people had registered for the event, in more than 180 teams.
"We really want to keep running this event and we are definitely keen to stay in Rotorua.
"It's exciting to to see people get out and go hard. It's very social and casual but there are some serious runners who take it quite seriously," he said.
Registration is taken online at www.rotoruaekiden.com but can also be made the day before the event - outside the Novotel Hotel between 2pm and 5pm tomorrow.
The start/finish line is on the Village Green, opposite the Novotel Hotel, at the Rotorua Lakefront.
Walkers start at 8am with the rest starting at 9am sharp.
The prizegiving will be at the same place but you have to be there to claim your prizes. Prizegiving starts at 3pm.