When should I lock my mortgage rate?
Most buyers lock once they have an accepted offer and a closing date, choosing a lock period that covers the time to closing (often 30 to 60 days). Ask your lender about float-down options and extension fees. ListingCraft for Buyers's closing checklist shows your closing date so you can pick the right lock length.
Rates can move daily, and nobody can predict them reliably. Locking protects your payment while your loan is processed.