The average long-term US mortgage rate jumped this week to its highest level in nearly three years.

The benchmark 30-year fixed-rate mortgage rose to 7.28% from 7.03% last week, mortgage buyer Freddie Mac said Thursday, the biggest leap in several years.

A year ago, the average rate was 6.34%.

It is the sixth consecutive week that mortgage rates have increased.

The average rate is now the highest it’s been since Nov. 22, 2023, when it reached 7.29%.

Borrowing costs on 15-year fixed-rate mortgages, often sought by borrowers refinancing a home loan, also climbed this week.

That average rate increased to 6.60% from 6.42% last week. A year ago, it was at 5.55%.

Higher mortgage rates can add hundreds of dollars a month to borrowers’ costs, limiting homebuyers’ purchasing power.

As rates rise, that can also lead prospective home shoppers to delay buying.

In late February, the average rate on a 30-year mortgage briefly dipped to 5.98%, its lowest level going back to late 2022.

The roughly 1 percentage point increase in the rate since then translates roughly into an additional $276 a month cost for a borrower financing a $400,000 home loan at the current average rate.

Depending on a borrower’s income, credit and other factors, they may qualify for a rate on a 30-year mortgage that is below or above the current average.

The housing market has been stuck in a rut this year in large part because of elevated mortgage rates, which have been climbing in the months since the US and Israel attacked Iran in late February.

Mortgage rates are influenced by inflation, Federal Reserve policy and bond-market investors’ expectations for the economy, among other factors.

They generally follow the trajectory of the 10-year Treasury yield, which lenders use as a guide to pricing home loans.

Expectations of higher inflation amid surging oil prices have pushed up the 10-year Treasury yield, which was at 3.97% in late February, before the war began.

It surged to 5.27% in midday trading on the bond market Thursday.

That puts it roughly back to where it was in 2007, on the eve of the real estate-induced financial crisis.

High yields slow the overall economy by making it more expensive for everyone to borrow money, while undercutting prices for stocks and other investments.

The US housing market has been in a slump since 2022, when mortgage rates began to climb from pandemic-era lows.

Sales of previously occupied US homes were essentially flat last year, stuck at a 30-year low.

Last month the National Association of Realtors said that existing home sales fell 2% in August from July to a seasonally adjusted annual rate of 3.98 million units.

That was their slowest annual pace in more than a year.