AUBURN, Washington — Reserved permit parking at Sounder stations is expanding to the South Sound.

Beginning June 1, riders arriving in single-occupant vehicles can pay to reserve a parking space at the Auburn and Puyallup stations. These stations typically fill up by 6:30 a.m. on weekdays, according to Sound Transit, and the permit system aims to help riders who can’t get to the station that early still get a parking spot.

The permits went on sale Wednesday.

Permits will cost $60 per month; riders who qualify for ORCA Lift will pay $20 per month. Sound Transit says it calculated to price based on market rates for commuter parking near the stations.

Free permits are also available for carpool groups of two or more.

Sound Transit says the number of permit spaces will vary based on how many people purchase permits, but it won’t exceed 50 percent of the lot.

The spaces will be held for permit holders until 8 a.m. on weekdays. After that spaces become open to anyone. Permits also won’t apply on holidays or weekends.

Sound Transit already sells solo-driver permits at the future Northgate light rail station and the Edmonds and Mukilteo Sounder stations. The agency plans to expand permitted parking at up to eight other transit hubs this year, including Tukwila, Kent, Lakewood, Federal Way, Issaquah, and Mercer Island.

New parking garages at the Auburn and Puyallup stations will bring an additional 500 parking slots apiece. Construction in Auburn is expected to finish in 2023, and the Puyallup garage is expected to open in 2022.