Why the Iran War Pushed Mortgage Rates Up, Not Down

Conventional wisdom says war is good for mortgage borrowers: investors panic, pile into safe U.S. Treasuries, yields fall, and mortgage rates drop. The 2026 Iran war flipped that script. Rather than falling, the average 30-year rate climbed from below 6% in late February to the mid-6% range by June. The reason is oil: the conflict sent crude toward 2022 highs, reignited inflation fears, and made investors sell Treasuries instead of buying them — pushing the 10-year yield back above 4.2% and California mortgage rates up with it.

How war normally lowers mortgage rates

During most geopolitical shocks, money rushes into Treasuries and mortgage-backed securities because they're considered safer than stocks. That "safe-haven effect" raises bond prices and lowers yields. Because the 30-year mortgage rate tracks the 10-year Treasury plus a spread, falling yields usually pull mortgage rates down. That's the playbook borrowers expect when headlines turn scary.

Why 2026 was different: the oil shock

The Iran conflict didn't just create fear — it created an energy supply shock. With threats to the Strait of Hormuz and strikes on regional oil infrastructure, crude prices surged toward their highest levels since 2022. Higher oil feeds directly into inflation, and inflation is the one thing bond investors hate most because it erodes the fixed payments a bond returns. So instead of buying Treasuries, investors sold them. Yields rose, and mortgage rates followed. The safe-haven instinct was overwhelmed by the inflation threat.

What it did to the 10-year Treasury

The benchmark 10-year yield climbed from roughly 3.96% just before the war to a range of 4.2%–4.5% through the spring, repeatedly touching its highest levels since 2025. Mortgage rates moved in near-lockstep, rising from sub-6% to the mid-6s. See our companion June 2026 California rate update for this month's exact numbers.

Why the Fed can't simply cut its way out

An oil-driven inflation spike ties the Federal Reserve's hands. Cutting rates into rising inflation risks making prices worse, so the Fed has held the federal funds rate steady and signaled only about one cut for the year. Even when the Fed does cut, remember that it sets short-term rates — mortgage rates follow the longer-term bond market, which is reacting to inflation, not the Fed's overnight rate. We explain that gap in our Fed meeting analysis.

About this update: Save Financial publishes weekly rate updates and monthly California market analysis. We are a California-licensed mortgage lender (NMLS #377740, DRE #01875766) serving all 58 counties. To get a real, personalized rate quote, apply online or call 888-703-1840.