Prevail Credit Union has some competitive certifcate rates. The best yields range from 4.30% APY for a 12-month term to 4.50% APY for a 60-month term. The minimum deposit for most of these CDs is $500. Slightly higher yields are available for minimum deposits of $50K and $100K.
Membership is open to anyone who lives or works in Washington State. Please see their Charter page for more details. Membership requires a minimum deposit of $5 in the savings account.
Branches are located in Seattle, Woodinville, Tukwila and Issaquah. The credit union is federally insured by the NCUA (Charter # 67693). It has $192.3 million in assets and 21,408 members.
Thanks to the reader who mentioned this credit union in the comments.