Growing concern about the national debt impacted home borrowing rates this week. Mortgage rates track the benchmark 10-year Treasury yield, which climbed higher as bonds sold off

The average rate on the 30-year fixed mortgage rose this week to 6.86%, according to the latest Freddie Mac data released on Thursday. That is up from last week's reading of 6.81%.

The average rate on a 30-year mortgage in the U.S. climbed this week to its highest level since mid-February, a setback for home shoppers that threatens to slow sales further this spring homebuying season.