Barrie Mason, North Yorkshire Council’s assistant director for highways, said visitors and those using main roads in the area should allow extra time for their journeys.
“With hot weather forecast and high traffic levels anticipated, there may be increased congestion and delays,” he said.
Wetherby Road will be one-way towards the showground from the Kestrel Roundabout to the junction with Rudding Lane from 06:30 on show days, organisers said.
The A658 from Thistle Hill junction to the Kestrel roundabout will also be one-way, but only in the mornings.
In the afternoons until 21:00, the direction will be reversed between Sainsbury’s and the Kestrel Roundabout to accommodate traffic leaving Harrogate.
The council said there would also be temporary traffic lights on the A59 Kex Gill which would be closely monitored through the week.
“Please be patient when travelling,” Mason added.
“As ever, please check traffic and travel information before setting off and consider alternative routes if necessary.”
