When the current state highway numbering system was first posted in January 1964, the highway that is now SR 308 was signed as part of SR 303. In 1971, the E-W portion of SR 303 from SR 3 to Keyport was renumbered SR 308. In the later 1970s, a freeway was built west of the earlier SR 3 alignment from Silverdale to Poulsbo. SR 308 was extended west from old SR 3, now Silverdale Way/Viking Way, to the freeway. The SR 3/SR 308 interchange also serves the main gate to the Bangor US Naval Submarine Base located west of SR 3. Today, SR 308 is 3.42 miles long.
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