30-Year Treasury Yield Hits 25-Year Peak at 5.216% Auction

A 30-year US Treasury bond auction stopped at 5.216% on August 18, 2026, a 25-year peak, per Reuters. A global bond selloff — driven by inflation and fiscal worries — pushed some yields to 19-year highs. The average 30-year fixed mortgage sat at 6.67% as of August 13, but the selloff's full impact on borrowing costs has not yet fed through.