The U.S. mortgage market is displaying remarkable resilience in March 2026, with purchase mortgage rate locks jumping 38% from February, according to Optimal Blue data. This growth occurs in a context where the average 30-year mortgage rate rose 45 basis points during the month, reaching 6.35%. Total mortgage lock volume increased 13% month-over-month and 26% year-over-year, marking the strongest spring season since the transition to higher rates.

The Big Picture

The housing market is experiencing dynamics that defy conventional logic. Historically, interest rate increases have cooled housing demand, but March 2026 presents a different scenario. Buyers are moving forward with transactions despite higher financing costs, suggesting structural factors are overcoming temporary rate barriers. The traditional spring season typically boosts activity, but the magnitude of the increase—38% in monthly purchase locks—exceeds most analysts' expectations.

This divergence between higher rates and stronger purchase activity reflects several concurrent factors. First, demographics are playing a crucial role: millennials in their peak family-forming years are entering the market, creating structural demand that transcends rate fluctuations. Second, persistent shortage of existing home inventory—particularly in metropolitan markets—is pushing buyers toward new construction, where longer delivery timelines allow for some planning amid rate volatility. Third, buyers appear to have internalized that rates in the 6% range represent the new normal, adjusting their affordability expectations rather than waiting for a return to the 3% levels seen in the previous decade.