Locking your rate is a personal decision. You should do what’s right for your situation rather than trying to time the market. If you’re buying a home, the right time to lock a rate is after you’ve secured a purchase agreement and shopped for your best mortgage deal. If you’re refinancing, you should make sure you compare offers from at least three to five lenders before locking a rate. That said, rates are rising. So the sooner you can lock in today’s market, the better.