The war in Iran is increasing the cost of buying a home in America, leading to the average 30-year fixed mortgage rate jumping to 6.22%, the highest level since early December. This comes after rates fell below 6% for the first time in over three years, a key psychological threshold that experts believe could reignite home buying and selling ahead of the spring homebuying season. The 10-year Treasury yield also rose from 3.96% before the war started to roughly 4.28% this week, indicating many investors fear higher oil prices could trigger inflation. The higher mortgage rates may already impact the Spring homebuiging season.