Mortgage interest rates in March surged by more than half a percentage point, on average, even with the Federal Reserve electing to keep its rate policy unchanged in the month. But with a series of disappointing economic reports in the month and heightened geopolitical tensions and overseas conflicts, mortgage rates spiked anyway. Case in point: The median mortgage interest rate for a 30-year mortgage was 5.75% on March 2 and 5.25% for a 15-year option. By March 31 , however, those same rates