Mortgage rates moved higher across the board during the week of March 29, 2026, adding to the cost of borrowing for homeowners looking to refinance. All three major rate types tracked by Wirly posted increases compared to the prior week, with the 15-year fixed rate seeing the largest jump. If you are watching rates closely, here is what the latest data shows and what it could mean for your refinance decision.
Rates as of March 26, 2026. Previous week data as of March 19, 2026. All rate data sourced from the Federal Reserve Economic Data (FRED).
This Week’s Rates
All three benchmark mortgage rates climbed during this period, continuing a trend that refinance-minded homeowners will want to watch carefully.
- 30-Year Fixed Rate: 6.38% – This rate rose 0.16% from the previous week. It remains the most popular choice for borrowers who want a predictable monthly payment over the long term.
- 15-Year Fixed Rate: 5.75% – This rate saw the biggest weekly increase, climbing 0.21%. While the 15-year option carries a higher monthly payment than the 30-year, it typically builds equity faster and costs less in total interest over the life of the loan.
- 5/1 Adjustable-Rate Mortgage (ARM): 6.06% – The 5/1 ARM increased by 0.11%, the smallest move of the three. This product offers a fixed rate for the first five years, then adjusts annually. It currently sits between the 15-year and 30-year fixed rates, which is an unusual positioning worth noting.
The fact that all three rate types moved up together suggests a broad market shift rather than a movement isolated to one loan product. For anyone comparing options, the spread between the 30-year fixed at 6.38% and the 15-year fixed at 5.75% is 0.63%, which may represent meaningful savings on interest over time for borrowers who can manage the higher monthly payment of a shorter loan term.
Why Rates Moved
To understand why mortgage rates shifted this week, it helps to look at two key benchmarks: the Federal Funds Rate and the 10-Year Treasury yield.
The Federal Funds Rate currently sits at 3.64%. This is the rate at which banks lend money to each other overnight, and it is set by the Federal Reserve. While the Fed Funds Rate does not directly control mortgage rates, it influences the overall cost of borrowing across the economy. A higher Fed Funds Rate tends to put upward pressure on many types of loans over time.
More directly tied to mortgage rates is the 10-Year Treasury yield, which stands at 4.42%. Mortgage lenders historically use the 10-Year Treasury as a reference point when pricing long-term home loans. When Treasury yields rise, mortgage rates tend to follow. When yields fall, mortgage rates often ease as well. The current gap between the 10-Year Treasury yield at 4.42% and the 30-year fixed mortgage rate at 6.38% is approximately 1.96 percentage points. This spread, sometimes called the “mortgage spread,” reflects lender risk premiums and other market factors. A wide spread like this could suggest that mortgage rates have room to ease if credit markets settle, though there is no guarantee of that outcome.
The combination of a Fed Funds Rate at 3.64% and a 10-Year Treasury yield at 4.42% paints a picture of a market that is still pricing in economic uncertainty. These conditions have contributed to upward pressure on mortgage rates in the near term.
What This Means for Refinancers
For homeowners considering a refinance, the rate increases this week are a reminder that timing can matter. A rise of even 0.16% to 0.21% on a large loan balance can add up to a meaningful difference in monthly payments and total interest paid over the life of a loan.
Here are a few practical points to keep in mind:
- Break-even period matters. When you refinance, you typically pay closing costs upfront in exchange for a lower rate or different loan term. If rates have risen since your last evaluation, the break-even point on those costs could take longer to reach.
- The 15-year fixed at 5.75% may still appeal to some borrowers. If you originally took out a 30-year loan at a higher rate and now have the budget to handle a larger monthly payment, refinancing into a 15-year fixed could reduce the total interest you pay over time.
- ARMs carry risk in a shifting rate environment. The 5/1 ARM at 6.06% is currently higher than the 15-year fixed rate at 5.75%. That unusual dynamic means the ARM does not offer the typical initial rate advantage some borrowers expect. Homeowners should weigh this carefully before choosing a variable-rate product.
- Your current rate is the key comparison point. If your existing mortgage rate is above 6.38%, there may still be a case for refinancing into a 30-year fixed today. If your current rate is already below these levels, waiting may make more financial sense depending on your goals.
Use the Wirly refinance calculator to model your specific situation with current rate data. Plugging in your current loan balance, remaining term, and today’s rates can help you estimate whether a refinance makes sense at this moment.
Should You Lock or Wait?
This is the question most refinancers wrestle with, and there is no single right answer. Here is a balanced look at both sides.
Reasons you might consider locking now:
- Rates have moved up three weeks in a row, and there is no guarantee they will reverse course in the near term.
- If you have already found a loan that improves your financial situation at current rates, locking in removes the risk of rates rising further before you close.
- Rate locks typically last 30 to 60 days, giving you time to finalize your refinance without being exposed to additional market swings.
Reasons you might consider waiting:
- The spread between the 10-Year Treasury at 4.42% and the 30-year mortgage rate at 6.38% is historically wide. If that spread narrows, mortgage rates could ease without the Fed needing to cut rates further.
- If the current rates do not produce enough savings to justify closing costs in your situation, waiting for a more favorable environment could make sense.
- Economic conditions can shift, and mortgage rates may respond accordingly over time.
Neither choice comes without risk. Locking protects you if rates rise further but means you miss out if rates fall. Waiting preserves optionality but exposes you to continued rate increases. The right call depends heavily on your personal financial situation and how long you plan to stay in your home.
Bottom Line
Mortgage rates rose across all three major loan types during the week ending March 29, 2026. The 30-year fixed reached 6.38%, the 15-year fixed climbed to 5.75%, and the 5/1 ARM rose to 6.06%. These moves occurred against a backdrop of a Fed Funds Rate at 3.64% and a 10-Year Treasury yield at 4.42%, both of which continue to influence borrowing costs across the market.
For homeowners thinking about refinancing, the most important step is to run the numbers based on your own loan details. Visit the Wirly refinance calculator to estimate your potential savings, and check out Wirly’s best refinance lenders to compare current offers from multiple sources. Understanding your options is always the right first move.
Wirly is an educational comparison platform and is not a lender or mortgage broker. Rate data sourced from the Federal Reserve Economic Data (FRED). Rates as of March 26, 2026.