At about 5:30 p.m., a man entered the Baskin-Robbins restaurant at 12822 Mukilteo Speedway, just outside Everett city limits.
The man took money from the cash register and left in a dark-colored truck, Snohomish County sheriff's spokeswoman Shari Ireton said. Investigators don't believe he displayed a weapon.
No injuries were reported.
Police searched the area but did not find a suspect, Ireton said. They were working Monday night to obtain any surveillance video that might show what happened.
The man was wearing a black jacket with a hoodie-style sweatshirt and a black mask.
Investigators don't believe the man is connected to a trio of recent restaurant robberies in Everett.
Anyone with information should call police at 425-388-3845.
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