What is the term for the time period between adjustment dates for an ARM?

The correct answer is indeed the "Adjustment Period." This term specifically refers to the time frame between adjustments in the interest rate on an Adjustable Rate Mortgage (ARM). During this period, the interest rate remains the same until the next adjustment date arrives, at which point the rate may change based on the terms outlined in the mortgage agreement, often tied to an index plus a margin.

Understanding the Adjustment Period is crucial for borrowers as it helps them anticipate when their mortgage payments might change and plan their finances accordingly. This period can vary based on the specific ARM product, ranging typically from one month to several years.

The other terms listed do not relate to the time frame between rate adjustments in an ARM. The Amortization Period refers to the total time over which the loan will be repaid, not the frequency of rate changes. The Grace Period typically pertains to payment schedules and the allowance of time to make a payment without penalty, while the Lock Period is associated with locking in an interest rate during the home-buying process rather than the adjustment intervals of an ARM.