At Business Insider, we monitor the best banks and credit unions daily to find the highest 18-month CD rates nationwide. The best 18-month CDs can generally be found at online banks and credit unions.

If you're interested in a short-term CD that will let you lock in a good interest rate, 6-month CDs could be a good choice. The national average CD rate on a 6-month term is 1.75% APY (Annual ...