The state government released a list of 34 agencies that will shut down July 1 if the state legislature doesn't pass a budget by the end of the month.
Governor Inslee's chief of staff said if lawmakers don't have a budget by next Monday, layoff notices will have to go out to state employees.
Layoffs of state employees would number in the thousands under the shutdown, including 3,000 of the Department of Corrections' 8,000 employees.
Two-thirds of all state agencies, boards and commissions would shut down, including all state parks, which means current camping and cabin reservations and scheduled special events would be cancelled.
Additionally, sex offenders would no longer be tracked by GPS, state lottery sales would be suspended and unemployment offices would close.
Emerald Downs, which is operated by the Horse Racing Commission, would also shut down.
The Washington Senate announced it would work this Saturday and Sunday.
Earlier this week, state lawmakers learned that revenue projections had increased, giving them an additional $231 million in revenue to consider for the 2013-15 operating budget.
A full list of potential shutdowns is available online.