You are closing in December and your lock expires on the 24th, and you are about to learn that the calendar does not stop for Christmas. A rate lock is measured in business days, and holidays quietly eat the window from inside. Here is how to count the days so your rate survives the break.

Rate locks run on business days

The term: mortgage rate locks are quoted in business days, meaning Monday through Friday, excluding federal holidays.

The meaning: a 30-day lock that includes a holiday week like Thanksgiving or Christmas effectively gives you fewer processing days than a clean 30-day stretch.

The real-world consequence: if your lock expires on a holiday, it effectively expires the next business day, which can land on a different day than you planned.

How holidays impact your lock

The meaning: when a federal holiday falls inside your lock period, title companies, county recording offices, and many lender processing departments close. Documents cannot be recorded, funds cannot be wired, and closings cannot happen on those days.

The money: a lock set to expire right after a holiday weekend can leave you with fewer business days than you expected, which is exactly how locks slip into expensive extensions.

The real-world consequence: the holiday does not change your rate, but it can change your timeline, and the timeline is what keeps the rate alive.

Planning your lock around holidays

The meaning: if you are closing during or near a holiday season, lock for a longer period. A 45-day lock is often safer than 30 days when your closing sits near Thanksgiving, Christmas, New Year's, or Independence Day.

The money: the extra cost of a longer lock is a small insurance premium against a holiday-pushed expiration, and it is cheaper than the extension fee you would pay later.

The real-world play: discuss holiday closings with your loan officer early, before you lock, so the window accounts for every non-business day. A quick look at the calendar up front saves a scramble later.

Recording offices and holidays

The meaning: county recording offices in Texas close for all federal and state holidays. If your closing date falls on a holiday, the deed cannot be recorded, and the closing shifts to the next business day.

The real-world consequence: your rate lock must remain valid through the actual recording date, not just your signing appointment. Confirm the recording office's holiday schedule with your title company when you schedule the closing.

The real-world play: for buyers in San Antonio and the Texas Hill Country, this is standard practice: count every closed day, pad the lock, and confirm the recording date. Do that and the holidays become a small footnote instead of a crisis. Make it a great one.