When applying for a mortgage, it is wise to compare different mortgage products with other lenders. When reviewing these products and terms, buyers may want to pay attention to one of the most critical factors: the interest rate.
The interest rate is essential for a mortgage because it directly affects the mortgage payment. If a buyer is offered a low rate, they may want to go ahead and lock it in.
But what does this mean, exactly? And what is the best day of the week to lock a mortgage rate?
View mortgage rates for
April 18, 2026
What Affects Interest Rates?
Before we get into the details of how to lock in a mortgage interest rate, we must first determine what affects interest rates.
Interest rates on mortgages depend on various things, including a buyer’s credit profile, loan-to-value ratio, and loan amount. These factors are significant, and rates can fluctuate over the week and even over the hours in a day. Buyers will want to maximize their savings by timing the locking in of their rate.
Locking In An Interest Rate
To “lock in” a mortgage interest rate refers to the point at which a lender promises to offer a rate for a specific amount of time during a buyer’s close of escrow period. The lender promises to honor this rate no matter how rates fluctuate during this period.
Typically, a mortgage rate is locked for 30 days, but this varies depending on the type of transaction (purchase or refinance). If the refinance or purchase takes a bit longer than this lock period, the buyer may be subject to lock extension fees.
Frequently Asked Questions
What does it mean to lock in a mortgage interest rate?
Locking in a mortgage rate means your lender commits to honoring a specific interest rate for a set period of time during your close of escrow, regardless of how market rates fluctuate. This gives you certainty over your mortgage payment and protects you from rate increases while your loan is being processed.
How long does a mortgage rate lock typically last?
A mortgage rate lock typically lasts 30 days, though this can vary depending on whether the transaction is a purchase or a refinance. If the loan takes longer to close than the lock period allows, the borrower may be subject to rate lock extension fees.
What factors affect mortgage interest rates?
Mortgage interest rates are influenced by a combination of market conditions and borrower-specific factors, including credit profile, loan-to-value ratio, and loan amount. Rates can fluctuate not just from day to day but even from hour to hour, which is why timing a rate lock thoughtfully can make a meaningful difference in long-term savings.
Is there a best day of the week to lock a mortgage rate?
There is no single day that guarantees the best rate, but mortgage rates tend to open on the lower end of the spectrum on Mondays, with more movement likely occurring mid-week. Because the market is volatile and unpredictable, the best approach is to stay informed, understand the rate you are being offered, and lock with a lender you trust when the rate makes sense for your budget.
What happens if my loan does not close before my rate lock expires?
If your loan does not close within the rate lock period, you may need to pay a lock extension fee to keep the same rate. The cost and availability of extensions vary by lender, so it is important to keep the process moving and communicate promptly with your lender to avoid unnecessary delays.
Should I wait for rates to drop before locking in?
Waiting for rates to drop is a gamble, since mortgage rates are driven by market forces that are difficult to predict. If you are offered a rate that fits your budget and financial goals, locking it in sooner rather than later provides certainty and protects you from potential rate increases. Trying to time the market perfectly can result in missing a good rate window altogether.
When Is The Best Time To Lock In Your Rate?
Mortgage rates tend to open in the lower end of the spectrum on Mondays, and rate movement is more likely to occur in the middle of the week.
The market is so volatile and unpredictable that rates could improve during the middle of the week compared to how markets opened.
This decision can make a huge difference in a buyer’s financial future, and the best thing to do is research. They will have to make sure they know what can affect rates to spot when a great rate is offered.
There isn’t a specific day that anyone can pinpoint, but buyers should lock in their rate with a lender they trust and when they understand the rate, they are being offered. JVM Lending strives to be as transparent as possible with homebuyers during this process and will always provide the lowest rates possible.
If you would like to learn more about JVM Lending’s interest rates or discuss your qualification in more detail, you can reach out to one of our expert Client Advisors. Our team is available 7 days a week by email at jvmteam@jvmlending.com or by phone at (855) 855-4491.
