The average 30-year fixed mortgage rate fell to 6.47% on June 18, 2026, marking a one-month low as progress on an Iran peace deal sent Treasury yields lower and eased pressure on borrowing costs. According to Freddie Mac, the rate dropped 5 basis points from 6.52% the previous week, offering modest relief to homebuyers after rates had climbed to 6.53% just two weeks earlier.
The mortgage rate decline follows a tentative U.S.-Iran agreement announced earlier this week to end the conflict that has roiled financial markets since late February. The deal includes provisions to reopen the Strait of Hormuz and allow Iran to sell its oil freely, immediately shifting investor sentiment toward lower energy prices and reduced inflation expectations.
Mortgage rates track the yield on the 10-year Treasury note, which fell from 4.53% the previous week to 4.44% as markets reacted to the peace deal announcement. The 10-year yield had spiked to 3.97% in late February before the Iran war began, then climbed steadily as oil supply concerns pushed inflation higher. The tentative agreement reversed that trend, with the yield retreating nearly a full percentage point from its peak.
The mechanism linking the Iran deal to mortgage rates runs through energy markets and inflation expectations. Since the conflict began in late February, crude oil prices surged, driving up gas prices and contributing to persistent inflation well above the Federal Reserve’s 2% target. That inflation kept Treasury yields elevated, which in turn kept mortgage rates high. The peace deal’s promise to restore Iranian oil to global markets sent crude prices tumbling to three-month lows, easing the inflation outlook and allowing bond investors to price in lower long-term interest rates.
Despite the week’s decline, mortgage rates remain elevated compared to late February, when the 30-year rate had slipped just under 6% for the first time since late 2022. The year-long conflict has kept borrowing costs well above pandemic-era lows, dampening housing demand. Sales of previously occupied U.S. homes declined in the first quarter compared to a year earlier, though pending home sales rose in May and April sales accelerated, suggesting cautious optimism heading into the second half of the year.
The Federal Reserve held its benchmark interest rate steady on Wednesday in the first meeting under new Chair Kevin Warsh, who replaced Jerome Powell. However, a number of Fed policymakers signaled they are willing to consider at least one rate hike later this year if inflation pressures persist, adding uncertainty to the mortgage rate outlook despite this week’s decline.
Sources
- Associated Press — mortgage rate figures, Treasury yield movements, Iran peace deal impact on financial markets, housing sales data
- Freddie Mac — 30-year and 15-year mortgage rate data for the week of June 18, 2026
- CNBC — Treasury yield decline following Iran peace deal announcement
